diff --git a/google-cloud-clients/google-cloud-asset/src/test/java/com/google/cloud/asset/v1/MockAssetServiceImpl.java b/google-cloud-clients/google-cloud-asset/src/test/java/com/google/cloud/asset/v1/MockAssetServiceImpl.java
index dfc5a34afeec..d43948cc1b6e 100644
--- a/google-cloud-clients/google-cloud-asset/src/test/java/com/google/cloud/asset/v1/MockAssetServiceImpl.java
+++ b/google-cloud-clients/google-cloud-asset/src/test/java/com/google/cloud/asset/v1/MockAssetServiceImpl.java
@@ -28,7 +28,7 @@
 @javax.annotation.Generated("by GAPIC")
 @BetaApi
 public class MockAssetServiceImpl extends AssetServiceImplBase {
-  private ArrayList<AbstractMessage> requests;
+  private List<AbstractMessage> requests;
   private Queue<Object> responses;
 
   public MockAssetServiceImpl() {
diff --git a/google-cloud-clients/google-cloud-asset/src/test/java/com/google/cloud/asset/v1beta1/MockAssetServiceImpl.java b/google-cloud-clients/google-cloud-asset/src/test/java/com/google/cloud/asset/v1beta1/MockAssetServiceImpl.java
index 9ee35ed3772e..ce972310b56a 100644
--- a/google-cloud-clients/google-cloud-asset/src/test/java/com/google/cloud/asset/v1beta1/MockAssetServiceImpl.java
+++ b/google-cloud-clients/google-cloud-asset/src/test/java/com/google/cloud/asset/v1beta1/MockAssetServiceImpl.java
@@ -28,7 +28,7 @@
 @javax.annotation.Generated("by GAPIC")
 @BetaApi
 public class MockAssetServiceImpl extends AssetServiceImplBase {
-  private ArrayList<AbstractMessage> requests;
+  private List<AbstractMessage> requests;
   private Queue<Object> responses;
 
   public MockAssetServiceImpl() {
diff --git a/google-cloud-clients/google-cloud-asset/synth.metadata b/google-cloud-clients/google-cloud-asset/synth.metadata
index e2d868f098df..7d06b73aa83e 100644
--- a/google-cloud-clients/google-cloud-asset/synth.metadata
+++ b/google-cloud-clients/google-cloud-asset/synth.metadata
@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-04-01T14:06:38.380692Z",
+  "updateTime": "2019-04-02T07:33:08.616294Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.21",
-        "dockerImage": "googleapis/artman@sha256:854131ec1af7b3a313253474c24748dc0acd217a58a0b74dbfb559f340a15d78"
+        "version": "0.16.22",
+        "dockerImage": "googleapis/artman@sha256:e7f9554322a8aa1416c122c918fdc4cdec8cfe816f027fc948dec0be7edef320"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "396a61102a4ca1e08194a6a52026d2d17834bc66",
-        "internalRef": "241317525"
+        "sha": "6c48ab5aef47dc14e02e2dc718d232a28067129d",
+        "internalRef": "241437588"
       }
     }
   ],