diff --git a/google-cloud-clients/pom.xml b/google-cloud-clients/pom.xml
index ecdad53aa7d7..63e28e6fffb0 100644
--- a/google-cloud-clients/pom.xml
+++ b/google-cloud-clients/pom.xml
@@ -162,7 +162,7 @@
     <nettyssl.version>2.0.7.Final</nettyssl.version>
     <guava.version>20.0</guava.version>
     <http-client.version>1.23.0</http-client.version>
-    <protobuf.version>3.5.1</protobuf.version>
+    <protobuf.version>3.6.0</protobuf.version>
     <opencensus.version>0.11.1</opencensus.version>
     <!-- test dependency versions -->
     <easymock.version>3.4</easymock.version>