diff --git a/pom.xml b/pom.xml
index 8400d609de..6a8ee3f580 100644
--- a/pom.xml
+++ b/pom.xml
@@ -159,7 +159,7 @@
     <google.api.version>1.31.3</google.api.version>
     <google.http.version>1.39.0</google.http.version>
     <grpc.version>1.36.0</grpc.version>
-    <protobuf.version>3.15.5</protobuf.version>
+    <protobuf.version>3.15.6</protobuf.version>
     <opencensus.version>0.28.0</opencensus.version>
     <annotations-api.version>1.3.2</annotations-api.version>
     <guava.version>30.1-android</guava.version><!-- We are currently using the *-android version to support JDK7. -->