diff --git a/src/main/java/org/kohsuke/github/GHMilestone.java b/src/main/java/org/kohsuke/github/GHMilestone.java
index 50ad549e82..3ed54636c7 100644
--- a/src/main/java/org/kohsuke/github/GHMilestone.java
+++ b/src/main/java/org/kohsuke/github/GHMilestone.java
@@ -85,10 +85,29 @@ public void reopen() throws IOException {
         edit("state", "open");
     }
 
+    /**
+     * Deletes this milestone.
+     */
+    public void delete() throws IOException {
+        root.retrieve().method("DELETE").to(getApiRoute());
+    }
+
     private void edit(String key, Object value) throws IOException {
         new Requester(root)._with(key, value).method("PATCH").to(getApiRoute());
     }
 
+    public void setTitle(String title) throws IOException {
+        edit("title", title);
+    }
+
+    public void setDescription(String description) throws IOException {
+        edit("description", description);
+    }
+
+    public void setDueOn(Date dueOn) throws IOException {
+        edit("due_on", GitHub.printDate(dueOn));
+    }
+
     protected String getApiRoute() {
         return "/repos/"+owner.getOwnerName()+"/"+owner.getName()+"/milestones/"+number;
     }
diff --git a/src/main/java/org/kohsuke/github/GitHub.java b/src/main/java/org/kohsuke/github/GitHub.java
index 9fbcac916e..0cbf425970 100644
--- a/src/main/java/org/kohsuke/github/GitHub.java
+++ b/src/main/java/org/kohsuke/github/GitHub.java
@@ -956,7 +956,9 @@ public Reader renderMarkdown(String text) throws IOException {
     }
 
     /*package*/ static String printDate(Date dt) {
-        return new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'").format(dt);
+        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
+        df.setTimeZone(TimeZone.getTimeZone("GMT"));
+        return df.format(dt);
     }
 
     /*package*/ static final ObjectMapper MAPPER = new ObjectMapper();
diff --git a/src/test/java/org/kohsuke/github/GHMilestoneTest.java b/src/test/java/org/kohsuke/github/GHMilestoneTest.java
new file mode 100644
index 0000000000..c0ab886743
--- /dev/null
+++ b/src/test/java/org/kohsuke/github/GHMilestoneTest.java
@@ -0,0 +1,64 @@
+package org.kohsuke.github;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.util.Date;
+
+/**
+ * @author Martin van Zijl
+ */
+public class GHMilestoneTest extends AbstractGitHubWireMockTest {
+
+    @Before
+    @After
+    public void cleanUp() throws Exception {
+        // Cleanup is only needed when proxying
+        if (!mockGitHub.isUseProxy()) {
+            return;
+        }
+
+        for (GHMilestone milestone : getRepository(gitHubBeforeAfter).listMilestones(GHIssueState.ALL)) {
+            if ("Original Title".equals(milestone.getTitle()) ||
+                "Updated Title".equals(milestone.getTitle())) {
+                milestone.delete();
+            }
+        }
+    }
+
+    @Test
+    public void testUpdateMilestone() throws Exception {
+        GHRepository repo = getRepository();
+        GHMilestone milestone = repo.createMilestone("Original Title",
+                "To test the update methods");
+
+        String NEW_TITLE = "Updated Title";
+        String NEW_DESCRIPTION = "Updated Description";
+        Date NEW_DUE_DATE = GitHub.parseDate("2020-10-05T13:00:00Z");
+        Date OUTPUT_DUE_DATE = GitHub.parseDate("2020-10-05T07:00:00Z");
+
+        milestone.setTitle(NEW_TITLE);
+        milestone.setDescription(NEW_DESCRIPTION);
+        milestone.setDueOn(NEW_DUE_DATE);
+
+        // Force reload.
+        milestone = repo.getMilestone(milestone.getNumber());
+
+        assertEquals(NEW_TITLE, milestone.getTitle());
+        assertEquals(NEW_DESCRIPTION, milestone.getDescription());
+
+        // The time is truncated when sent to the server, but still part of the returned value
+        // 07:00 midnight PDT
+        assertEquals(OUTPUT_DUE_DATE, milestone.getDueOn());
+    }
+
+    protected GHRepository getRepository() throws IOException {
+        return getRepository(gitHub);
+    }
+
+    private GHRepository getRepository(GitHub gitHub) throws IOException {
+        return gitHub.getOrganization("github-api-test-org").getRepository("github-api");
+    }
+}
diff --git a/src/test/java/org/kohsuke/github/GitHubStaticTest.java b/src/test/java/org/kohsuke/github/GitHubStaticTest.java
new file mode 100644
index 0000000000..793f23cc7c
--- /dev/null
+++ b/src/test/java/org/kohsuke/github/GitHubStaticTest.java
@@ -0,0 +1,72 @@
+package org.kohsuke.github;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.text.SimpleDateFormat;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.Date;
+import java.util.TimeZone;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.not;
+
+/**
+ * Unit test for {@link GitHub} static helpers.
+ *
+ * @author Liam Newman
+ */
+public class GitHubStaticTest extends Assert {
+
+    @Test
+    public void timeRoundTrip() throws Exception {
+        Instant instantNow = Instant.now();
+
+        Date instantSeconds = Date.from(instantNow.truncatedTo(ChronoUnit.SECONDS));
+        Date instantMillis = Date.from(instantNow.truncatedTo(ChronoUnit.MILLIS));
+
+        // TODO: other formats
+        String instantFormatSlash = formatDate(instantMillis, "yyyy/MM/dd HH:mm:ss ZZZZ");
+        String instantFormatDash = formatDate(instantMillis, "yyyy-MM-dd'T'HH:mm:ss'Z'");
+        String instantFormatMillis = formatDate(instantMillis, "yyyy-MM-dd'T'HH:mm:ss.S'Z'");
+        String instantSecondsFormatMillis = formatDate(instantSeconds, "yyyy-MM-dd'T'HH:mm:ss.S'Z'");
+        String instantBadFormat = formatDate(instantMillis, "yy-MM-dd'T'HH:mm'Z'");
+
+
+        assertThat(GitHub.parseDate(GitHub.printDate(instantSeconds)),
+            equalTo(GitHub.parseDate(GitHub.printDate(instantMillis))));
+
+        assertThat(instantSeconds,
+            equalTo(GitHub.parseDate(GitHub.printDate(instantSeconds))));
+
+        assertThat(instantMillis,
+            not(equalTo(GitHub.parseDate(GitHub.printDate(instantMillis)))));
+
+        assertThat(instantSeconds,
+            equalTo(GitHub.parseDate(instantFormatSlash)));
+
+        assertThat(instantSeconds,
+            equalTo(GitHub.parseDate(instantFormatDash)));
+
+        assertThat(instantMillis,
+            equalTo(GitHub.parseDate(instantFormatMillis)));
+
+        assertThat(instantSeconds,
+            equalTo(GitHub.parseDate(instantSecondsFormatMillis)));
+
+        try {
+            GitHub.parseDate(instantBadFormat);
+            fail("Bad time format should throw.");
+        } catch (IllegalStateException e) {
+            assertThat(e.getMessage(), equalTo("Unable to parse the timestamp: " + instantBadFormat));
+        }
+    }
+
+    static String formatDate(Date dt, String format) {
+        SimpleDateFormat df = new SimpleDateFormat(format);
+        df.setTimeZone(TimeZone.getTimeZone("GMT"));
+        return df.format(dt);
+    }
+
+}
diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/orgs_github-api-test-org-fdbcaf38-478b-440a-851a-b5913757f6f3.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/orgs_github-api-test-org-fdbcaf38-478b-440a-851a-b5913757f6f3.json
new file mode 100644
index 0000000000..99b5920ccb
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/orgs_github-api-test-org-fdbcaf38-478b-440a-851a-b5913757f6f3.json
@@ -0,0 +1,41 @@
+{
+  "login": "github-api-test-org",
+  "id": 7544739,
+  "node_id": "MDEyOk9yZ2FuaXphdGlvbjc1NDQ3Mzk=",
+  "url": "https://api.github.com/orgs/github-api-test-org",
+  "repos_url": "https://api.github.com/orgs/github-api-test-org/repos",
+  "events_url": "https://api.github.com/orgs/github-api-test-org/events",
+  "hooks_url": "https://api.github.com/orgs/github-api-test-org/hooks",
+  "issues_url": "https://api.github.com/orgs/github-api-test-org/issues",
+  "members_url": "https://api.github.com/orgs/github-api-test-org/members{/member}",
+  "public_members_url": "https://api.github.com/orgs/github-api-test-org/public_members{/member}",
+  "avatar_url": "https://avatars3.githubusercontent.com/u/7544739?v=4",
+  "description": null,
+  "is_verified": false,
+  "has_organization_projects": true,
+  "has_repository_projects": true,
+  "public_repos": 10,
+  "public_gists": 0,
+  "followers": 0,
+  "following": 0,
+  "html_url": "https://github.com/github-api-test-org",
+  "created_at": "2014-05-10T19:39:11Z",
+  "updated_at": "2015-04-20T00:42:30Z",
+  "type": "Organization",
+  "total_private_repos": 0,
+  "owned_private_repos": 0,
+  "private_gists": 0,
+  "disk_usage": 132,
+  "collaborators": 0,
+  "billing_email": "kk@kohsuke.org",
+  "default_repository_permission": "none",
+  "members_can_create_repositories": false,
+  "two_factor_requirement_enabled": false,
+  "plan": {
+    "name": "free",
+    "space": 976562499,
+    "private_repos": 0,
+    "filled_seats": 7,
+    "seats": 0
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/repos_github-api-test-org_github-api-701999a2-14ad-4078-ab89-b0f722cbc52f.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/repos_github-api-test-org_github-api-701999a2-14ad-4078-ab89-b0f722cbc52f.json
new file mode 100644
index 0000000000..0f9bc22b6b
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/repos_github-api-test-org_github-api-701999a2-14ad-4078-ab89-b0f722cbc52f.json
@@ -0,0 +1,330 @@
+{
+  "id": 206888201,
+  "node_id": "MDEwOlJlcG9zaXRvcnkyMDY4ODgyMDE=",
+  "name": "github-api",
+  "full_name": "github-api-test-org/github-api",
+  "private": false,
+  "owner": {
+    "login": "github-api-test-org",
+    "id": 7544739,
+    "node_id": "MDEyOk9yZ2FuaXphdGlvbjc1NDQ3Mzk=",
+    "avatar_url": "https://avatars3.githubusercontent.com/u/7544739?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/github-api-test-org",
+    "html_url": "https://github.com/github-api-test-org",
+    "followers_url": "https://api.github.com/users/github-api-test-org/followers",
+    "following_url": "https://api.github.com/users/github-api-test-org/following{/other_user}",
+    "gists_url": "https://api.github.com/users/github-api-test-org/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/github-api-test-org/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/github-api-test-org/subscriptions",
+    "organizations_url": "https://api.github.com/users/github-api-test-org/orgs",
+    "repos_url": "https://api.github.com/users/github-api-test-org/repos",
+    "events_url": "https://api.github.com/users/github-api-test-org/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/github-api-test-org/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "html_url": "https://github.com/github-api-test-org/github-api",
+  "description": "Tricky",
+  "fork": true,
+  "url": "https://api.github.com/repos/github-api-test-org/github-api",
+  "forks_url": "https://api.github.com/repos/github-api-test-org/github-api/forks",
+  "keys_url": "https://api.github.com/repos/github-api-test-org/github-api/keys{/key_id}",
+  "collaborators_url": "https://api.github.com/repos/github-api-test-org/github-api/collaborators{/collaborator}",
+  "teams_url": "https://api.github.com/repos/github-api-test-org/github-api/teams",
+  "hooks_url": "https://api.github.com/repos/github-api-test-org/github-api/hooks",
+  "issue_events_url": "https://api.github.com/repos/github-api-test-org/github-api/issues/events{/number}",
+  "events_url": "https://api.github.com/repos/github-api-test-org/github-api/events",
+  "assignees_url": "https://api.github.com/repos/github-api-test-org/github-api/assignees{/user}",
+  "branches_url": "https://api.github.com/repos/github-api-test-org/github-api/branches{/branch}",
+  "tags_url": "https://api.github.com/repos/github-api-test-org/github-api/tags",
+  "blobs_url": "https://api.github.com/repos/github-api-test-org/github-api/git/blobs{/sha}",
+  "git_tags_url": "https://api.github.com/repos/github-api-test-org/github-api/git/tags{/sha}",
+  "git_refs_url": "https://api.github.com/repos/github-api-test-org/github-api/git/refs{/sha}",
+  "trees_url": "https://api.github.com/repos/github-api-test-org/github-api/git/trees{/sha}",
+  "statuses_url": "https://api.github.com/repos/github-api-test-org/github-api/statuses/{sha}",
+  "languages_url": "https://api.github.com/repos/github-api-test-org/github-api/languages",
+  "stargazers_url": "https://api.github.com/repos/github-api-test-org/github-api/stargazers",
+  "contributors_url": "https://api.github.com/repos/github-api-test-org/github-api/contributors",
+  "subscribers_url": "https://api.github.com/repos/github-api-test-org/github-api/subscribers",
+  "subscription_url": "https://api.github.com/repos/github-api-test-org/github-api/subscription",
+  "commits_url": "https://api.github.com/repos/github-api-test-org/github-api/commits{/sha}",
+  "git_commits_url": "https://api.github.com/repos/github-api-test-org/github-api/git/commits{/sha}",
+  "comments_url": "https://api.github.com/repos/github-api-test-org/github-api/comments{/number}",
+  "issue_comment_url": "https://api.github.com/repos/github-api-test-org/github-api/issues/comments{/number}",
+  "contents_url": "https://api.github.com/repos/github-api-test-org/github-api/contents/{+path}",
+  "compare_url": "https://api.github.com/repos/github-api-test-org/github-api/compare/{base}...{head}",
+  "merges_url": "https://api.github.com/repos/github-api-test-org/github-api/merges",
+  "archive_url": "https://api.github.com/repos/github-api-test-org/github-api/{archive_format}{/ref}",
+  "downloads_url": "https://api.github.com/repos/github-api-test-org/github-api/downloads",
+  "issues_url": "https://api.github.com/repos/github-api-test-org/github-api/issues{/number}",
+  "pulls_url": "https://api.github.com/repos/github-api-test-org/github-api/pulls{/number}",
+  "milestones_url": "https://api.github.com/repos/github-api-test-org/github-api/milestones{/number}",
+  "notifications_url": "https://api.github.com/repos/github-api-test-org/github-api/notifications{?since,all,participating}",
+  "labels_url": "https://api.github.com/repos/github-api-test-org/github-api/labels{/name}",
+  "releases_url": "https://api.github.com/repos/github-api-test-org/github-api/releases{/id}",
+  "deployments_url": "https://api.github.com/repos/github-api-test-org/github-api/deployments",
+  "created_at": "2019-09-06T23:26:04Z",
+  "updated_at": "2019-10-30T01:54:39Z",
+  "pushed_at": "2019-10-21T22:34:49Z",
+  "git_url": "git://github.com/github-api-test-org/github-api.git",
+  "ssh_url": "git@github.com:github-api-test-org/github-api.git",
+  "clone_url": "https://github.com/github-api-test-org/github-api.git",
+  "svn_url": "https://github.com/github-api-test-org/github-api",
+  "homepage": "http://github-api.kohsuke.org/",
+  "size": 11391,
+  "stargazers_count": 0,
+  "watchers_count": 0,
+  "language": "Java",
+  "has_issues": true,
+  "has_projects": true,
+  "has_downloads": true,
+  "has_wiki": true,
+  "has_pages": false,
+  "forks_count": 0,
+  "mirror_url": null,
+  "archived": false,
+  "disabled": false,
+  "open_issues_count": 0,
+  "license": {
+    "key": "mit",
+    "name": "MIT License",
+    "spdx_id": "MIT",
+    "url": "https://api.github.com/licenses/mit",
+    "node_id": "MDc6TGljZW5zZTEz"
+  },
+  "forks": 0,
+  "open_issues": 0,
+  "watchers": 0,
+  "default_branch": "master",
+  "permissions": {
+    "admin": true,
+    "push": true,
+    "pull": true
+  },
+  "allow_squash_merge": true,
+  "allow_merge_commit": true,
+  "allow_rebase_merge": true,
+  "organization": {
+    "login": "github-api-test-org",
+    "id": 7544739,
+    "node_id": "MDEyOk9yZ2FuaXphdGlvbjc1NDQ3Mzk=",
+    "avatar_url": "https://avatars3.githubusercontent.com/u/7544739?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/github-api-test-org",
+    "html_url": "https://github.com/github-api-test-org",
+    "followers_url": "https://api.github.com/users/github-api-test-org/followers",
+    "following_url": "https://api.github.com/users/github-api-test-org/following{/other_user}",
+    "gists_url": "https://api.github.com/users/github-api-test-org/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/github-api-test-org/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/github-api-test-org/subscriptions",
+    "organizations_url": "https://api.github.com/users/github-api-test-org/orgs",
+    "repos_url": "https://api.github.com/users/github-api-test-org/repos",
+    "events_url": "https://api.github.com/users/github-api-test-org/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/github-api-test-org/received_events",
+    "type": "Organization",
+    "site_admin": false
+  },
+  "parent": {
+    "id": 617210,
+    "node_id": "MDEwOlJlcG9zaXRvcnk2MTcyMTA=",
+    "name": "github-api",
+    "full_name": "github-api/github-api",
+    "private": false,
+    "owner": {
+      "login": "github-api",
+      "id": 54909825,
+      "node_id": "MDEyOk9yZ2FuaXphdGlvbjU0OTA5ODI1",
+      "avatar_url": "https://avatars3.githubusercontent.com/u/54909825?v=4",
+      "gravatar_id": "",
+      "url": "https://api.github.com/users/github-api",
+      "html_url": "https://github.com/github-api",
+      "followers_url": "https://api.github.com/users/github-api/followers",
+      "following_url": "https://api.github.com/users/github-api/following{/other_user}",
+      "gists_url": "https://api.github.com/users/github-api/gists{/gist_id}",
+      "starred_url": "https://api.github.com/users/github-api/starred{/owner}{/repo}",
+      "subscriptions_url": "https://api.github.com/users/github-api/subscriptions",
+      "organizations_url": "https://api.github.com/users/github-api/orgs",
+      "repos_url": "https://api.github.com/users/github-api/repos",
+      "events_url": "https://api.github.com/users/github-api/events{/privacy}",
+      "received_events_url": "https://api.github.com/users/github-api/received_events",
+      "type": "Organization",
+      "site_admin": false
+    },
+    "html_url": "https://github.com/github-api/github-api",
+    "description": "Java API for GitHub",
+    "fork": false,
+    "url": "https://api.github.com/repos/github-api/github-api",
+    "forks_url": "https://api.github.com/repos/github-api/github-api/forks",
+    "keys_url": "https://api.github.com/repos/github-api/github-api/keys{/key_id}",
+    "collaborators_url": "https://api.github.com/repos/github-api/github-api/collaborators{/collaborator}",
+    "teams_url": "https://api.github.com/repos/github-api/github-api/teams",
+    "hooks_url": "https://api.github.com/repos/github-api/github-api/hooks",
+    "issue_events_url": "https://api.github.com/repos/github-api/github-api/issues/events{/number}",
+    "events_url": "https://api.github.com/repos/github-api/github-api/events",
+    "assignees_url": "https://api.github.com/repos/github-api/github-api/assignees{/user}",
+    "branches_url": "https://api.github.com/repos/github-api/github-api/branches{/branch}",
+    "tags_url": "https://api.github.com/repos/github-api/github-api/tags",
+    "blobs_url": "https://api.github.com/repos/github-api/github-api/git/blobs{/sha}",
+    "git_tags_url": "https://api.github.com/repos/github-api/github-api/git/tags{/sha}",
+    "git_refs_url": "https://api.github.com/repos/github-api/github-api/git/refs{/sha}",
+    "trees_url": "https://api.github.com/repos/github-api/github-api/git/trees{/sha}",
+    "statuses_url": "https://api.github.com/repos/github-api/github-api/statuses/{sha}",
+    "languages_url": "https://api.github.com/repos/github-api/github-api/languages",
+    "stargazers_url": "https://api.github.com/repos/github-api/github-api/stargazers",
+    "contributors_url": "https://api.github.com/repos/github-api/github-api/contributors",
+    "subscribers_url": "https://api.github.com/repos/github-api/github-api/subscribers",
+    "subscription_url": "https://api.github.com/repos/github-api/github-api/subscription",
+    "commits_url": "https://api.github.com/repos/github-api/github-api/commits{/sha}",
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new file mode 100644
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@@ -0,0 +1,37 @@
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+  "node_id": "MDk6TWlsZXN0b25lNDgwMDEwOA==",
+  "number": 2,
+  "title": "Original Title",
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+    "id": 1958953,
+    "node_id": "MDQ6VXNlcjE5NTg5NTM=",
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+    "html_url": "https://github.com/bitwiseman",
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diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/repos_github-api-test-org_github-api_milestones_2-80930c65-6614-40e9-8cfb-51244eb49764.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/repos_github-api-test-org_github-api_milestones_2-80930c65-6614-40e9-8cfb-51244eb49764.json
new file mode 100644
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@@ -0,0 +1,37 @@
+{
+  "url": "https://api.github.com/repos/github-api-test-org/github-api/milestones/2",
+  "html_url": "https://github.com/github-api-test-org/github-api/milestone/2",
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+  "id": 4800108,
+  "node_id": "MDk6TWlsZXN0b25lNDgwMDEwOA==",
+  "number": 2,
+  "title": "Updated Title",
+  "description": "To test the update methods",
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+    "id": 1958953,
+    "node_id": "MDQ6VXNlcjE5NTg5NTM=",
+    "avatar_url": "https://avatars3.githubusercontent.com/u/1958953?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bitwiseman",
+    "html_url": "https://github.com/bitwiseman",
+    "followers_url": "https://api.github.com/users/bitwiseman/followers",
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diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/repos_github-api-test-org_github-api_milestones_2-865125bf-0f31-4650-b668-9d5d72c47680.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/repos_github-api-test-org_github-api_milestones_2-865125bf-0f31-4650-b668-9d5d72c47680.json
new file mode 100644
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@@ -0,0 +1,37 @@
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+  "html_url": "https://github.com/github-api-test-org/github-api/milestone/2",
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+  "node_id": "MDk6TWlsZXN0b25lNDgwMDEwOA==",
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+  "description": "Updated Description",
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+    "events_url": "https://api.github.com/users/bitwiseman/events{/privacy}",
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diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/repos_github-api-test-org_github-api_milestones_2-b24a5b3a-76c0-44f6-950b-d0fdec878349.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/repos_github-api-test-org_github-api_milestones_2-b24a5b3a-76c0-44f6-950b-d0fdec878349.json
new file mode 100644
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@@ -0,0 +1,37 @@
+{
+  "url": "https://api.github.com/repos/github-api-test-org/github-api/milestones/2",
+  "html_url": "https://github.com/github-api-test-org/github-api/milestone/2",
+  "labels_url": "https://api.github.com/repos/github-api-test-org/github-api/milestones/2/labels",
+  "id": 4800108,
+  "node_id": "MDk6TWlsZXN0b25lNDgwMDEwOA==",
+  "number": 2,
+  "title": "Updated Title",
+  "description": "Updated Description",
+  "creator": {
+    "login": "bitwiseman",
+    "id": 1958953,
+    "node_id": "MDQ6VXNlcjE5NTg5NTM=",
+    "avatar_url": "https://avatars3.githubusercontent.com/u/1958953?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bitwiseman",
+    "html_url": "https://github.com/bitwiseman",
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+    "subscriptions_url": "https://api.github.com/users/bitwiseman/subscriptions",
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+    "repos_url": "https://api.github.com/users/bitwiseman/repos",
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diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/repos_github-api-test-org_github-api_milestones_2-fffe46e8-0b2e-4195-8e42-857e3127cd0b.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/repos_github-api-test-org_github-api_milestones_2-fffe46e8-0b2e-4195-8e42-857e3127cd0b.json
new file mode 100644
index 0000000000..a388cf456d
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@@ -0,0 +1,37 @@
+{
+  "url": "https://api.github.com/repos/github-api-test-org/github-api/milestones/2",
+  "html_url": "https://github.com/github-api-test-org/github-api/milestone/2",
+  "labels_url": "https://api.github.com/repos/github-api-test-org/github-api/milestones/2/labels",
+  "id": 4800108,
+  "node_id": "MDk6TWlsZXN0b25lNDgwMDEwOA==",
+  "number": 2,
+  "title": "Updated Title",
+  "description": "Updated Description",
+  "creator": {
+    "login": "bitwiseman",
+    "id": 1958953,
+    "node_id": "MDQ6VXNlcjE5NTg5NTM=",
+    "avatar_url": "https://avatars3.githubusercontent.com/u/1958953?v=4",
+    "gravatar_id": "",
+    "url": "https://api.github.com/users/bitwiseman",
+    "html_url": "https://github.com/bitwiseman",
+    "followers_url": "https://api.github.com/users/bitwiseman/followers",
+    "following_url": "https://api.github.com/users/bitwiseman/following{/other_user}",
+    "gists_url": "https://api.github.com/users/bitwiseman/gists{/gist_id}",
+    "starred_url": "https://api.github.com/users/bitwiseman/starred{/owner}{/repo}",
+    "subscriptions_url": "https://api.github.com/users/bitwiseman/subscriptions",
+    "organizations_url": "https://api.github.com/users/bitwiseman/orgs",
+    "repos_url": "https://api.github.com/users/bitwiseman/repos",
+    "events_url": "https://api.github.com/users/bitwiseman/events{/privacy}",
+    "received_events_url": "https://api.github.com/users/bitwiseman/received_events",
+    "type": "User",
+    "site_admin": false
+  },
+  "open_issues": 0,
+  "closed_issues": 0,
+  "state": "open",
+  "created_at": "2019-10-30T22:04:20Z",
+  "updated_at": "2019-10-30T22:04:21Z",
+  "due_on": "2020-10-05T07:00:00Z",
+  "closed_at": null
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/user-7feb269c-7db0-4c3f-8c58-f99bdf1cafe8.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/user-7feb269c-7db0-4c3f-8c58-f99bdf1cafe8.json
new file mode 100644
index 0000000000..a4b576e8a7
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/__files/user-7feb269c-7db0-4c3f-8c58-f99bdf1cafe8.json
@@ -0,0 +1,45 @@
+{
+  "login": "bitwiseman",
+  "id": 1958953,
+  "node_id": "MDQ6VXNlcjE5NTg5NTM=",
+  "avatar_url": "https://avatars3.githubusercontent.com/u/1958953?v=4",
+  "gravatar_id": "",
+  "url": "https://api.github.com/users/bitwiseman",
+  "html_url": "https://github.com/bitwiseman",
+  "followers_url": "https://api.github.com/users/bitwiseman/followers",
+  "following_url": "https://api.github.com/users/bitwiseman/following{/other_user}",
+  "gists_url": "https://api.github.com/users/bitwiseman/gists{/gist_id}",
+  "starred_url": "https://api.github.com/users/bitwiseman/starred{/owner}{/repo}",
+  "subscriptions_url": "https://api.github.com/users/bitwiseman/subscriptions",
+  "organizations_url": "https://api.github.com/users/bitwiseman/orgs",
+  "repos_url": "https://api.github.com/users/bitwiseman/repos",
+  "events_url": "https://api.github.com/users/bitwiseman/events{/privacy}",
+  "received_events_url": "https://api.github.com/users/bitwiseman/received_events",
+  "type": "User",
+  "site_admin": false,
+  "name": "Liam Newman",
+  "company": "Cloudbees, Inc.",
+  "blog": "",
+  "location": "Seattle, WA, USA",
+  "email": "bitwiseman@gmail.com",
+  "hireable": null,
+  "bio": "https://twitter.com/bitwiseman",
+  "public_repos": 169,
+  "public_gists": 7,
+  "followers": 139,
+  "following": 9,
+  "created_at": "2012-07-11T20:38:33Z",
+  "updated_at": "2019-09-24T19:32:29Z",
+  "private_gists": 7,
+  "total_private_repos": 9,
+  "owned_private_repos": 0,
+  "disk_usage": 33697,
+  "collaborators": 0,
+  "two_factor_authentication": true,
+  "plan": {
+    "name": "free",
+    "space": 976562499,
+    "collaborators": 0,
+    "private_repos": 10000
+  }
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/orgs_github-api-test-org-2-fdbcaf.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/orgs_github-api-test-org-2-fdbcaf.json
new file mode 100644
index 0000000000..e42826ff10
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/orgs_github-api-test-org-2-fdbcaf.json
@@ -0,0 +1,43 @@
+{
+  "id": "fdbcaf38-478b-440a-851a-b5913757f6f3",
+  "name": "orgs_github-api-test-org",
+  "request": {
+    "url": "/orgs/github-api-test-org",
+    "method": "GET"
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "orgs_github-api-test-org-fdbcaf38-478b-440a-851a-b5913757f6f3.json",
+    "headers": {
+      "Date": "Wed, 30 Oct 2019 22:04:20 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4950",
+      "X-RateLimit-Reset": "1572476616",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"bbee0a14a82ca84871298052e1bcb545\"",
+      "Last-Modified": "Mon, 20 Apr 2015 00:42:30 GMT",
+      "X-OAuth-Scopes": "admin:org, admin:org_hook, admin:public_key, admin:repo_hook, delete_repo, gist, notifications, repo, user, write:discussion",
+      "X-Accepted-OAuth-Scopes": "admin:org, read:org, repo, user, write:org",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "F2AC:26CD:64AA4:B171A:5DBA08E2"
+    }
+  },
+  "uuid": "fdbcaf38-478b-440a-851a-b5913757f6f3",
+  "persistent": true,
+  "insertionIndex": 2
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api-3-701999.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api-3-701999.json
new file mode 100644
index 0000000000..2770826787
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api-3-701999.json
@@ -0,0 +1,43 @@
+{
+  "id": "701999a2-14ad-4078-ab89-b0f722cbc52f",
+  "name": "repos_github-api-test-org_github-api",
+  "request": {
+    "url": "/repos/github-api-test-org/github-api",
+    "method": "GET"
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_github-api-test-org_github-api-701999a2-14ad-4078-ab89-b0f722cbc52f.json",
+    "headers": {
+      "Date": "Wed, 30 Oct 2019 22:04:20 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4949",
+      "X-RateLimit-Reset": "1572476616",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"50590b38f0a75703e69533e84bda5c10\"",
+      "Last-Modified": "Wed, 30 Oct 2019 01:54:39 GMT",
+      "X-OAuth-Scopes": "admin:org, admin:org_hook, admin:public_key, admin:repo_hook, delete_repo, gist, notifications, repo, user, write:discussion",
+      "X-Accepted-OAuth-Scopes": "repo",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "F2AC:26CD:64AA6:B173A:5DBA08E4"
+    }
+  },
+  "uuid": "701999a2-14ad-4078-ab89-b0f722cbc52f",
+  "persistent": true,
+  "insertionIndex": 3
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones-4-a7ebf1.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones-4-a7ebf1.json
new file mode 100644
index 0000000000..6cccf55064
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones-4-a7ebf1.json
@@ -0,0 +1,47 @@
+{
+  "id": "a7ebf1ae-cbbb-4c59-8844-6888ad2493ba",
+  "name": "repos_github-api-test-org_github-api_milestones",
+  "request": {
+    "url": "/repos/github-api-test-org/github-api/milestones",
+    "method": "POST",
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"description\":\"To test the update methods\",\"title\":\"Original Title\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": true
+      }
+    ]
+  },
+  "response": {
+    "status": 201,
+    "bodyFileName": "repos_github-api-test-org_github-api_milestones-a7ebf1ae-cbbb-4c59-8844-6888ad2493ba.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Wed, 30 Oct 2019 22:04:20 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "201 Created",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4948",
+      "X-RateLimit-Reset": "1572476616",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": "Accept, Authorization, Cookie, X-GitHub-OTP",
+      "ETag": "\"ce66f12f4b019a623862f9099dd8ac06\"",
+      "X-OAuth-Scopes": "admin:org, admin:org_hook, admin:public_key, admin:repo_hook, delete_repo, gist, notifications, repo, user, write:discussion",
+      "X-Accepted-OAuth-Scopes": "",
+      "Location": "https://api.github.com/repos/github-api-test-org/github-api/milestones/2",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "F2AC:26CD:64AA9:B173C:5DBA08E4"
+    }
+  },
+  "uuid": "a7ebf1ae-cbbb-4c59-8844-6888ad2493ba",
+  "persistent": true,
+  "insertionIndex": 4
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-5-80930c.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-5-80930c.json
new file mode 100644
index 0000000000..031df1abd5
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-5-80930c.json
@@ -0,0 +1,49 @@
+{
+  "id": "80930c65-6614-40e9-8cfb-51244eb49764",
+  "name": "repos_github-api-test-org_github-api_milestones_2",
+  "request": {
+    "url": "/repos/github-api-test-org/github-api/milestones/2",
+    "method": "PATCH",
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"title\":\"Updated Title\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": true
+      }
+    ]
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_github-api-test-org_github-api_milestones_2-80930c65-6614-40e9-8cfb-51244eb49764.json",
+    "headers": {
+      "Date": "Wed, 30 Oct 2019 22:04:21 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4947",
+      "X-RateLimit-Reset": "1572476616",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"870c796ce201b8d104442df63f095b43\"",
+      "X-OAuth-Scopes": "admin:org, admin:org_hook, admin:public_key, admin:repo_hook, delete_repo, gist, notifications, repo, user, write:discussion",
+      "X-Accepted-OAuth-Scopes": "",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "F2AC:26CD:64AAB:B1740:5DBA08E4"
+    }
+  },
+  "uuid": "80930c65-6614-40e9-8cfb-51244eb49764",
+  "persistent": true,
+  "insertionIndex": 5
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-6-865125.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-6-865125.json
new file mode 100644
index 0000000000..6f622186ac
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-6-865125.json
@@ -0,0 +1,46 @@
+{
+  "id": "865125bf-0f31-4650-b668-9d5d72c47680",
+  "name": "repos_github-api-test-org_github-api_milestones_2",
+  "request": {
+    "url": "/repos/github-api-test-org/github-api/milestones/2",
+    "method": "PATCH",
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"description\":\"Updated Description\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": true
+      }
+    ]
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_github-api-test-org_github-api_milestones_2-865125bf-0f31-4650-b668-9d5d72c47680.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Wed, 30 Oct 2019 22:04:21 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4946",
+      "X-RateLimit-Reset": "1572476616",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": "Accept, Authorization, Cookie, X-GitHub-OTP",
+      "ETag": "W/\"d4dd5030d06a729043f3d03079e9fe3d\"",
+      "X-OAuth-Scopes": "admin:org, admin:org_hook, admin:public_key, admin:repo_hook, delete_repo, gist, notifications, repo, user, write:discussion",
+      "X-Accepted-OAuth-Scopes": "",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "F2AC:26CD:64AAE:B1744:5DBA08E5"
+    }
+  },
+  "uuid": "865125bf-0f31-4650-b668-9d5d72c47680",
+  "persistent": true,
+  "insertionIndex": 6
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-7-b24a5b.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-7-b24a5b.json
new file mode 100644
index 0000000000..c34ee3e36b
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-7-b24a5b.json
@@ -0,0 +1,49 @@
+{
+  "id": "b24a5b3a-76c0-44f6-950b-d0fdec878349",
+  "name": "repos_github-api-test-org_github-api_milestones_2",
+  "request": {
+    "url": "/repos/github-api-test-org/github-api/milestones/2",
+    "method": "PATCH",
+    "bodyPatterns": [
+      {
+        "equalToJson": "{\"due_on\":\"2020-10-05T13:00:00Z\"}",
+        "ignoreArrayOrder": true,
+        "ignoreExtraElements": true
+      }
+    ]
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_github-api-test-org_github-api_milestones_2-b24a5b3a-76c0-44f6-950b-d0fdec878349.json",
+    "headers": {
+      "Date": "Wed, 30 Oct 2019 22:04:21 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4945",
+      "X-RateLimit-Reset": "1572476616",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"f6b5158570f599d271e8d001b807457e\"",
+      "X-OAuth-Scopes": "admin:org, admin:org_hook, admin:public_key, admin:repo_hook, delete_repo, gist, notifications, repo, user, write:discussion",
+      "X-Accepted-OAuth-Scopes": "",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "F2AC:26CD:64AB1:B1749:5DBA08E5"
+    }
+  },
+  "uuid": "b24a5b3a-76c0-44f6-950b-d0fdec878349",
+  "persistent": true,
+  "insertionIndex": 7
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-8-fffe46.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-8-fffe46.json
new file mode 100644
index 0000000000..8261347b99
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/repos_github-api-test-org_github-api_milestones_2-8-fffe46.json
@@ -0,0 +1,43 @@
+{
+  "id": "fffe46e8-0b2e-4195-8e42-857e3127cd0b",
+  "name": "repos_github-api-test-org_github-api_milestones_2",
+  "request": {
+    "url": "/repos/github-api-test-org/github-api/milestones/2",
+    "method": "GET"
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "repos_github-api-test-org_github-api_milestones_2-fffe46e8-0b2e-4195-8e42-857e3127cd0b.json",
+    "headers": {
+      "Date": "Wed, 30 Oct 2019 22:04:21 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Server": "GitHub.com",
+      "Status": "200 OK",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4944",
+      "X-RateLimit-Reset": "1572476616",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": [
+        "Accept, Authorization, Cookie, X-GitHub-OTP",
+        "Accept-Encoding"
+      ],
+      "ETag": "W/\"f6b5158570f599d271e8d001b807457e\"",
+      "Last-Modified": "Wed, 30 Oct 2019 22:04:21 GMT",
+      "X-OAuth-Scopes": "admin:org, admin:org_hook, admin:public_key, admin:repo_hook, delete_repo, gist, notifications, repo, user, write:discussion",
+      "X-Accepted-OAuth-Scopes": "repo",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "F2AC:26CD:64AB3:B174F:5DBA08E5"
+    }
+  },
+  "uuid": "fffe46e8-0b2e-4195-8e42-857e3127cd0b",
+  "persistent": true,
+  "insertionIndex": 8
+}
\ No newline at end of file
diff --git a/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/user-1-7feb26.json b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/user-1-7feb26.json
new file mode 100644
index 0000000000..9d8543b240
--- /dev/null
+++ b/src/test/resources/org/kohsuke/github/GHMilestoneTest/wiremock/testUpdateMilestone/mappings/user-1-7feb26.json
@@ -0,0 +1,40 @@
+{
+  "id": "7feb269c-7db0-4c3f-8c58-f99bdf1cafe8",
+  "name": "user",
+  "request": {
+    "url": "/user",
+    "method": "GET"
+  },
+  "response": {
+    "status": 200,
+    "bodyFileName": "user-7feb269c-7db0-4c3f-8c58-f99bdf1cafe8.json",
+    "headers": {
+      "Server": "GitHub.com",
+      "Date": "Wed, 30 Oct 2019 22:04:18 GMT",
+      "Content-Type": "application/json; charset=utf-8",
+      "Status": "200 OK",
+      "X-RateLimit-Limit": "5000",
+      "X-RateLimit-Remaining": "4955",
+      "X-RateLimit-Reset": "1572476616",
+      "Cache-Control": "private, max-age=60, s-maxage=60",
+      "Vary": "Accept, Authorization, Cookie, X-GitHub-OTP",
+      "ETag": "W/\"8c3d3dcf6fc5f9edaf26c902295396e5\"",
+      "Last-Modified": "Tue, 24 Sep 2019 19:32:29 GMT",
+      "X-OAuth-Scopes": "admin:org, admin:org_hook, admin:public_key, admin:repo_hook, delete_repo, gist, notifications, repo, user, write:discussion",
+      "X-Accepted-OAuth-Scopes": "",
+      "X-GitHub-Media-Type": "unknown, github.v3",
+      "Access-Control-Expose-Headers": "ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type",
+      "Access-Control-Allow-Origin": "*",
+      "Strict-Transport-Security": "max-age=31536000; includeSubdomains; preload",
+      "X-Frame-Options": "deny",
+      "X-Content-Type-Options": "nosniff",
+      "X-XSS-Protection": "1; mode=block",
+      "Referrer-Policy": "origin-when-cross-origin, strict-origin-when-cross-origin",
+      "Content-Security-Policy": "default-src 'none'",
+      "X-GitHub-Request-Id": "F2AC:26CD:64A8F:B1718:5DBA08E2"
+    }
+  },
+  "uuid": "7feb269c-7db0-4c3f-8c58-f99bdf1cafe8",
+  "persistent": true,
+  "insertionIndex": 1
+}
\ No newline at end of file