diff --git a/pom.xml b/pom.xml
index e84729026..a44ef9106 100644
--- a/pom.xml
+++ b/pom.xml
@@ -24,7 +24,7 @@
         <revision>2.5.2</revision>
         <changelist>-SNAPSHOT</changelist>
         <java.level>8</java.level>
-        <jenkins.version>2.121.3</jenkins.version>
+        <jenkins.version>2.138.4</jenkins.version>
         <scm-api.version>2.3.0</scm-api.version>
         <okhttp3.version>3.12.2</okhttp3.version>
         <okio.version>2.2.2</okio.version>
@@ -245,6 +245,11 @@
                 </executions>
                 <configuration>
                     <compatibleSinceVersion>2.2.0</compatibleSinceVersion>
+                    <!-- <pluginFirstClassLoader>true</pluginFirstClassLoader> -->
+                    <maskClasses>
+                        okhttp3.
+                        okio.
+                    </maskClasses>
                 </configuration>
             </plugin>
         </plugins>
diff --git a/src/main/java/org/jenkinsci/plugins/github_branch_source/Connector.java b/src/main/java/org/jenkinsci/plugins/github_branch_source/Connector.java
index b74992598..d19b7c7b3 100644
--- a/src/main/java/org/jenkinsci/plugins/github_branch_source/Connector.java
+++ b/src/main/java/org/jenkinsci/plugins/github_branch_source/Connector.java
@@ -403,9 +403,9 @@ public static void checkApiUrlValidity(@Nonnull GitHub gitHub, @CheckForNull Sta
             OkHttpClient client = clientBuilder.build();
 
             if (client.cache() != null) {
-                gb.withConnector(new ForceValidationOkHttpConnector(new OkUrlFactory(client)));
+                gb.withConnector(new ForceValidationOkHttpConnector(client));
             } else {
-                gb.withConnector(new OkHttp3Connector(new OkUrlFactory(client)));
+                gb.withConnector(new OkHttp3Connector(client));
             }
 
             if (username != null) {
@@ -743,8 +743,8 @@ public String toString() {
         private static final String HEADER_NAME = "Cache-Control";
         private final OkHttp3Connector delegate;
 
-        public ForceValidationOkHttpConnector(OkUrlFactory okUrlFactory) {
-            this.delegate = new OkHttp3Connector(okUrlFactory);
+        public ForceValidationOkHttpConnector(OkHttpClient client) {
+            this.delegate = new OkHttp3Connector(client);
         }
 
         /*package*/ HttpConnector getDelegate() {
diff --git a/src/main/java/org/jenkinsci/plugins/github_branch_source/OkHttp3Connector.java b/src/main/java/org/jenkinsci/plugins/github_branch_source/OkHttp3Connector.java
index 302a5ab49..e81f3e5a4 100644
--- a/src/main/java/org/jenkinsci/plugins/github_branch_source/OkHttp3Connector.java
+++ b/src/main/java/org/jenkinsci/plugins/github_branch_source/OkHttp3Connector.java
@@ -1,6 +1,5 @@
 package org.jenkinsci.plugins.github_branch_source;
 
-
 import okhttp3.ConnectionSpec;
 import okhttp3.OkHttpClient;
 import okhttp3.OkUrlFactory;
@@ -11,15 +10,9 @@
 import java.net.HttpURLConnection;
 import java.net.URL;
 
-import java.security.KeyManagementException;
-import java.security.NoSuchAlgorithmException;
-
 import java.util.Arrays;
 import java.util.List;
 
-import javax.net.ssl.SSLContext;
-import javax.net.ssl.SSLSocketFactory;
-
 
 /**
  * {@link HttpConnector} for {@link OkHttpClient}.
@@ -33,37 +26,22 @@
  * @author Kohsuke Kawaguchi
  */
 public class OkHttp3Connector implements HttpConnector {
+    private final OkHttpClient client;
     private final OkUrlFactory urlFactory;
 
-    public OkHttp3Connector(OkUrlFactory urlFactory) {
-        OkHttpClient.Builder builder = urlFactory.client().newBuilder();
-        builder.sslSocketFactory(TlsSocketFactory());
-        builder.connectionSpecs(TlsConnectionSpecs());
-        urlFactory.setClient(builder.build());
+    public OkHttp3Connector(OkHttpClient client) {
 
-        this.urlFactory = urlFactory;
+        OkHttpClient.Builder builder = client.newBuilder();
+
+        builder.connectionSpecs(TlsConnectionSpecs());
+        this.client = builder.build();
+        this.urlFactory = new OkUrlFactory(this.client);
     }
 
     public HttpURLConnection connect(URL url) throws IOException {
         return urlFactory.open(url);
     }
 
-    /** Returns TLSv1.2 only SSL Socket Factory. */
-    private SSLSocketFactory TlsSocketFactory() {
-        SSLContext sc;
-        try {
-            sc = SSLContext.getInstance("TLSv1.2");
-        } catch (NoSuchAlgorithmException e) {
-            throw new RuntimeException(e.getMessage(), e);
-        }
-        try {
-            sc.init(null, null, null);
-            return sc.getSocketFactory();
-        } catch (KeyManagementException e) {
-            throw new RuntimeException(e.getMessage(), e);
-        }
-    }
-
     /** Returns connection spec with TLS v1.2 in it */
     private List<ConnectionSpec> TlsConnectionSpecs() {
         return Arrays.asList(ConnectionSpec.MODERN_TLS, ConnectionSpec.CLEARTEXT);