diff --git a/README.md b/README.md
index dcfd9cf6af..2ef6f4587c 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>libraries-bom</artifactId>
-      <version>4.4.1</version>
+      <version>5.1.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>
diff --git a/google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1alpha2/MockBigQueryWriteImpl.java b/google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1alpha2/MockBigQueryWriteImpl.java
index a82a3dbdb3..32e15e28d0 100644
--- a/google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1alpha2/MockBigQueryWriteImpl.java
+++ b/google-cloud-bigquerystorage/src/test/java/com/google/cloud/bigquery/storage/v1alpha2/MockBigQueryWriteImpl.java
@@ -83,12 +83,11 @@ public void createWriteStream(
   @Override
   public StreamObserver<AppendRowsRequest> appendRows(
       final StreamObserver<AppendRowsResponse> responseObserver) {
+    final Object response = responses.remove();
     StreamObserver<AppendRowsRequest> requestObserver =
         new StreamObserver<AppendRowsRequest>() {
           @Override
           public void onNext(AppendRowsRequest value) {
-            requests.add(value);
-            final Object response = responses.remove();
             if (response instanceof AppendRowsResponse) {
               responseObserver.onNext((AppendRowsResponse) response);
             } else if (response instanceof Exception) {
diff --git a/synth.metadata b/synth.metadata
index db492867f5..677205f0df 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -11,7 +11,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigquerystorage.git",
-        "sha": "a0db93e9d1f714a68dd11ef38c782099701dd068"
+        "sha": "532a698193542b0a5db03d2e29a415082f2de95b"
       }
     },
     {