diff --git a/pom.xml b/pom.xml
index d3befb2ea..d814ba177 100644
--- a/pom.xml
+++ b/pom.xml
@@ -188,7 +188,7 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-bigqueryconnection-v1</artifactId>
-        <version>2.5.5</version>
+        <version>2.5.6</version>
         <scope>test</scope>
       </dependency>
     </dependencies>