diff --git a/google-cloud-firestore-admin/src/main/java/com/google/cloud/firestore/v1/stub/FirestoreAdminStubSettings.java b/google-cloud-firestore-admin/src/main/java/com/google/cloud/firestore/v1/stub/FirestoreAdminStubSettings.java
index ae1dbe22f..c2bbfcb97 100644
--- a/google-cloud-firestore-admin/src/main/java/com/google/cloud/firestore/v1/stub/FirestoreAdminStubSettings.java
+++ b/google-cloud-firestore-admin/src/main/java/com/google/cloud/firestore/v1/stub/FirestoreAdminStubSettings.java
@@ -336,6 +336,11 @@ public static String getDefaultEndpoint() {
     return "firestore.googleapis.com:443";
   }
 
+  /** Returns the default mTLS service endpoint. */
+  public static String getDefaultMtlsEndpoint() {
+    return "firestore.mtls.googleapis.com:443";
+  }
+
   /** Returns the default service scopes. */
   public static List<String> getDefaultServiceScopes() {
     return DEFAULT_SERVICE_SCOPES;
@@ -543,6 +548,8 @@ 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-firestore/src/main/java/com/google/cloud/firestore/v1/stub/FirestoreStubSettings.java b/google-cloud-firestore/src/main/java/com/google/cloud/firestore/v1/stub/FirestoreStubSettings.java
index 9b3560334..d1fc98256 100644
--- a/google-cloud-firestore/src/main/java/com/google/cloud/firestore/v1/stub/FirestoreStubSettings.java
+++ b/google-cloud-firestore/src/main/java/com/google/cloud/firestore/v1/stub/FirestoreStubSettings.java
@@ -414,6 +414,11 @@ public static String getDefaultEndpoint() {
     return "firestore.googleapis.com:443";
   }
 
+  /** Returns the default mTLS service endpoint. */
+  public static String getDefaultMtlsEndpoint() {
+    return "firestore.mtls.googleapis.com:443";
+  }
+
   /** Returns the default service scopes. */
   public static List<String> getDefaultServiceScopes() {
     return DEFAULT_SERVICE_SCOPES;
@@ -704,6 +709,8 @@ 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/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/CollectionGroupName.java b/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/CollectionGroupName.java
index 220aa164a..5accac5ab 100644
--- a/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/CollectionGroupName.java
+++ b/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/CollectionGroupName.java
@@ -211,9 +211,9 @@ public Builder setCollection(String collection) {
     }
 
     private Builder(CollectionGroupName collectionGroupName) {
-      project = collectionGroupName.project;
-      database = collectionGroupName.database;
-      collection = collectionGroupName.collection;
+      this.project = collectionGroupName.project;
+      this.database = collectionGroupName.database;
+      this.collection = collectionGroupName.collection;
     }
 
     public CollectionGroupName build() {
diff --git a/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/DatabaseName.java b/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/DatabaseName.java
index b86af52e8..fe882d8ce 100644
--- a/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/DatabaseName.java
+++ b/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/DatabaseName.java
@@ -181,8 +181,8 @@ public Builder setDatabase(String database) {
     }
 
     private Builder(DatabaseName databaseName) {
-      project = databaseName.project;
-      database = databaseName.database;
+      this.project = databaseName.project;
+      this.database = databaseName.database;
     }
 
     public DatabaseName build() {
diff --git a/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/FieldName.java b/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/FieldName.java
index 1032bc5a3..2129adb9f 100644
--- a/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/FieldName.java
+++ b/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/FieldName.java
@@ -247,10 +247,10 @@ public Builder setField(String field) {
     }
 
     private Builder(FieldName fieldName) {
-      project = fieldName.project;
-      database = fieldName.database;
-      collection = fieldName.collection;
-      field = fieldName.field;
+      this.project = fieldName.project;
+      this.database = fieldName.database;
+      this.collection = fieldName.collection;
+      this.field = fieldName.field;
     }
 
     public FieldName build() {
diff --git a/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/IndexName.java b/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/IndexName.java
index b21ffaecf..85b7eaa17 100644
--- a/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/IndexName.java
+++ b/proto-google-cloud-firestore-admin-v1/src/main/java/com/google/firestore/admin/v1/IndexName.java
@@ -247,10 +247,10 @@ public Builder setIndex(String index) {
     }
 
     private Builder(IndexName indexName) {
-      project = indexName.project;
-      database = indexName.database;
-      collection = indexName.collection;
-      index = indexName.index;
+      this.project = indexName.project;
+      this.database = indexName.database;
+      this.collection = indexName.collection;
+      this.index = indexName.index;
     }
 
     public IndexName build() {
diff --git a/synth.metadata b/synth.metadata
index f3695d769..78fbe692d 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -11,8 +11,8 @@
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "9e3105549a35520f215359065c11e8dce15e18af",
-        "internalRef": "378266372"
+        "sha": "551681f25e36b11829e87e580281350461f4f3f5",
+        "internalRef": "379784268"
       }
     },
     {