diff --git a/spring-cloud-gcp-autoconfigure/src/test/java/com/google/cloud/spring/autoconfigure/trace/pubsub/TraceHelperTests.java b/spring-cloud-gcp-autoconfigure/src/test/java/com/google/cloud/spring/autoconfigure/trace/pubsub/TraceHelperTests.java
index 648d449d49..44794b52b2 100644
--- a/spring-cloud-gcp-autoconfigure/src/test/java/com/google/cloud/spring/autoconfigure/trace/pubsub/TraceHelperTests.java
+++ b/spring-cloud-gcp-autoconfigure/src/test/java/com/google/cloud/spring/autoconfigure/trace/pubsub/TraceHelperTests.java
@@ -66,7 +66,6 @@ void should_inject_child_context() {
     assertThat(producerSpan.kind()).isEqualTo(PRODUCER);
     assertChildOf(producerSpan, parent);
     assertThat(instrumentedMessage.getAttributesMap())
-        .isNotNull()
         .containsEntry("b3", producerSpan.traceId() + "-" + producerSpan.id() + "-1");
   }
 
diff --git a/spring-cloud-gcp-dependencies/pom.xml b/spring-cloud-gcp-dependencies/pom.xml
index ce43e79b22..0a9f68a1f7 100644
--- a/spring-cloud-gcp-dependencies/pom.xml
+++ b/spring-cloud-gcp-dependencies/pom.xml
@@ -29,7 +29,7 @@
 	</distributionManagement>
 
 	<properties>
-		<gcp-libraries-bom.version>26.49.0</gcp-libraries-bom.version>
+		<gcp-libraries-bom.version>26.51.0</gcp-libraries-bom.version>
 		<cloud-sql-socket-factory.version>1.20.1</cloud-sql-socket-factory.version>
 		<r2dbc-mysql-driver.version>0.9.7</r2dbc-mysql-driver.version>
 		<r2dbc-postgres-driver.version>0.8.13.RELEASE</r2dbc-postgres-driver.version>
diff --git a/spring-cloud-gcp-pubsub/src/test/java/com/google/cloud/spring/pubsub/support/DefaultPublisherFactoryTests.java b/spring-cloud-gcp-pubsub/src/test/java/com/google/cloud/spring/pubsub/support/DefaultPublisherFactoryTests.java
index 1fc4e7df42..71b94953a1 100644
--- a/spring-cloud-gcp-pubsub/src/test/java/com/google/cloud/spring/pubsub/support/DefaultPublisherFactoryTests.java
+++ b/spring-cloud-gcp-pubsub/src/test/java/com/google/cloud/spring/pubsub/support/DefaultPublisherFactoryTests.java
@@ -19,6 +19,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
@@ -46,6 +47,7 @@ public void setUp() throws IOException {
     factory.setCredentialsProvider(NoCredentialsProvider.create());
     TransportChannelProvider mockChannelProvider = mock(TransportChannelProvider.class);
     TransportChannel mockTransportChannel = mock(TransportChannel.class);
+    when(mockChannelProvider.withUseS2A(anyBoolean())).thenReturn(mockChannelProvider);
     when(mockChannelProvider.getTransportChannel()).thenReturn(mockTransportChannel);
     ApiCallContext mockContext = mock(ApiCallContext.class);
     when(mockTransportChannel.getEmptyCallContext()).thenReturn(mockContext);