diff --git a/Octokit/Models/Request/RepositoryUpdate.cs b/Octokit/Models/Request/RepositoryUpdate.cs
index 02dda177e3..a671fd991f 100644
--- a/Octokit/Models/Request/RepositoryUpdate.cs
+++ b/Octokit/Models/Request/RepositoryUpdate.cs
@@ -114,6 +114,14 @@ public RepositoryUpdate() { }
         /// </summary>
         public bool? AllowForking { get; set; }
 
+        /// <summary>
+        /// Optional. Get or set whether to always allow a pull request head branch that is behind its base branch
+        /// to be updated even if it is not required to be up to date before merging, or false otherwise.
+        /// The default is null (do not update). The default when created is false. 
+        /// Available since GitHub Enterprise 3.1 (2021-05-06)
+        /// </summary>
+        public bool? AllowUpdateBranch { get; set; }
+
         internal string DebuggerDisplay => new SimpleJsonSerializer().Serialize(this);
     }
 }
diff --git a/Octokit/Models/Response/Repository.cs b/Octokit/Models/Response/Repository.cs
index ba7b2c697f..6de79eaaad 100644
--- a/Octokit/Models/Response/Repository.cs
+++ b/Octokit/Models/Response/Repository.cs
@@ -17,7 +17,7 @@ public Repository(long id)
             Id = id;
         }
 
-        public Repository(string url, string htmlUrl, string cloneUrl, string gitUrl, string sshUrl, string svnUrl, string mirrorUrl, long id, string nodeId, User owner, string name, string fullName, bool isTemplate, string description, string homepage, string language, bool @private, bool fork, int forksCount, int stargazersCount, string defaultBranch, int openIssuesCount, DateTimeOffset? pushedAt, DateTimeOffset createdAt, DateTimeOffset updatedAt, RepositoryPermissions permissions, Repository parent, Repository source, LicenseMetadata license, bool hasIssues, bool hasWiki, bool hasDownloads, bool hasPages, int subscribersCount, long size, bool? allowRebaseMerge, bool? allowSquashMerge, bool? allowMergeCommit, bool archived, int watchersCount, bool? deleteBranchOnMerge, RepositoryVisibility visibility, IEnumerable<string> topics, bool? allowAutoMerge)
+        public Repository(string url, string htmlUrl, string cloneUrl, string gitUrl, string sshUrl, string svnUrl, string mirrorUrl, long id, string nodeId, User owner, string name, string fullName, bool isTemplate, string description, string homepage, string language, bool @private, bool fork, int forksCount, int stargazersCount, string defaultBranch, int openIssuesCount, DateTimeOffset? pushedAt, DateTimeOffset createdAt, DateTimeOffset updatedAt, RepositoryPermissions permissions, Repository parent, Repository source, LicenseMetadata license, bool hasIssues, bool hasWiki, bool hasDownloads, bool hasPages, int subscribersCount, long size, bool? allowRebaseMerge, bool? allowSquashMerge, bool? allowMergeCommit, bool archived, int watchersCount, bool? deleteBranchOnMerge, RepositoryVisibility visibility, IEnumerable<string> topics, bool? allowAutoMerge, bool? allowUpdateBranch)
         {
             Url = url;
             HtmlUrl = htmlUrl;
@@ -65,6 +65,7 @@ public Repository(string url, string htmlUrl, string cloneUrl, string gitUrl, st
             DeleteBranchOnMerge = deleteBranchOnMerge;
             Visibility = visibility;
             AllowAutoMerge = allowAutoMerge;
+            AllowUpdateBranch = allowUpdateBranch;
         }
 
         public string Url { get; private set; }
@@ -158,6 +159,8 @@ public Repository(string url, string htmlUrl, string cloneUrl, string gitUrl, st
         public RepositoryVisibility? Visibility { get; private set; }
 
         public bool? AllowAutoMerge { get; private set; }
+        
+        public bool? AllowUpdateBranch { get; private set; }
 
         internal string DebuggerDisplay
         {