diff --git a/google-cloud-pubsub/.factorypath b/google-cloud-pubsub/.factorypath
new file mode 100644
index 000000000..27b6d1c5a
--- /dev/null
+++ b/google-cloud-pubsub/.factorypath
@@ -0,0 +1,3 @@
+<factorypath>
+    <factorypathentry kind="VARJAR" id="M2_REPO/com/google/auto/value/auto-value/1.7.4/auto-value-1.7.4.jar" enabled="true" runInBatchMode="false"/>
+</factorypath>
diff --git a/google-cloud-pubsub/pom.xml b/google-cloud-pubsub/pom.xml
index 74d79fde2..e65cade24 100644
--- a/google-cloud-pubsub/pom.xml
+++ b/google-cloud-pubsub/pom.xml
@@ -17,17 +17,35 @@
     <site.installationModule>google-cloud-pubsub</site.installationModule>
   </properties>
   <dependencies>
+    <dependency>
+      <groupId>io.grpc</groupId>
+      <artifactId>grpc-netty-shaded</artifactId>
+      <version>1.37.0-SNAPSHOT</version>
+    </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-api</artifactId>
+      <version>1.37.0-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>io.grpc</groupId>
+      <artifactId>grpc-auth</artifactId>
+      <version>1.37.0-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>io.grpc</groupId>
+      <artifactId>grpc-grpclb</artifactId>
+      <version>1.37.0-SNAPSHOT</version>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-stub</artifactId>
+      <version>1.37.0-SNAPSHOT</version>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-protobuf</artifactId>
+      <version>1.37.0-SNAPSHOT</version>
     </dependency>
     <dependency>
       <groupId>com.google.api</groupId>
@@ -77,6 +95,7 @@
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-core</artifactId>
+      <version>1.37.0-SNAPSHOT</version>
     </dependency>
     <dependency>
       <groupId>com.google.errorprone</groupId>
@@ -192,4 +211,4 @@
       </dependencies>
     </profile>
   </profiles>
-</project>
\ No newline at end of file
+</project>
diff --git a/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/stub/PublisherStubSettings.java b/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/stub/PublisherStubSettings.java
index 696671660..b4e144fc3 100644
--- a/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/stub/PublisherStubSettings.java
+++ b/google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/stub/PublisherStubSettings.java
@@ -233,6 +233,10 @@ public static String getDefaultEndpoint() {
     return "pubsub.googleapis.com:443";
   }
 
+  public static String getDefaultMtlsEndpoint() {
+    return "pubsub.mtls.googleapis.com:443";
+  }
+
   /** Returns the default service scopes. */
   public static List<String> getDefaultServiceScopes() {
     return DEFAULT_SERVICE_SCOPES;
@@ -695,6 +699,8 @@ private static Builder createDefault() {
       builder.setCredentialsProvider(defaultCredentialsProviderBuilder().build());
       builder.setInternalHeaderProvider(defaultApiClientHeaderProviderBuilder().build());
       builder.setEndpoint(getDefaultEndpoint());
+      builder.setMtlsEndpoint(getDefaultMtlsEndpoint());
+      builder.setSwitchToMtlsEndpointAllowed(true);
       return initDefaults(builder);
     }
 
diff --git a/google-cloud-pubsub/src/test/java/com/google/cloud/pubsub/v1/aMtlsSampleTest.java b/google-cloud-pubsub/src/test/java/com/google/cloud/pubsub/v1/aMtlsSampleTest.java
new file mode 100644
index 000000000..7fe5f0db6
--- /dev/null
+++ b/google-cloud-pubsub/src/test/java/com/google/cloud/pubsub/v1/aMtlsSampleTest.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2016 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.cloud.pubsub.v1;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import com.google.pubsub.v1.ProjectName;
+import com.google.pubsub.v1.Topic;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class aMtlsSampleTest {
+  @Test
+  public void myTest() throws Exception {
+    Logger log = Logger.getLogger("io.grpc");
+    log.setLevel(Level.FINEST);
+    TopicAdminClient topicAdminClient = TopicAdminClient.create();
+    ProjectName projectName = ProjectName.of("dcatest-281318");
+    for (Topic topic : topicAdminClient.listTopics(projectName).iterateAll()) {
+      System.out.println(topic.getName());
+    }
+    System.out.println("Listed all topics.");
+  }
+}
+