diff --git a/pom.xml b/pom.xml
index dbc67954..4e3a2cd2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -64,7 +64,7 @@
     <github.global.server>github</github.global.server>
     <site.installationModule>google-iam-parent</site.installationModule>
     <google.common-protos.version>1.17.0</google.common-protos.version>
-    <protobuf.version>3.15.2</protobuf.version>
+    <protobuf.version>3.15.6</protobuf.version>
     <junit.version>4.13.2</junit.version>
     <grpc.version>1.36.0</grpc.version>
     <guava.version>30.1-android</guava.version>