diff --git a/pom.xml b/pom.xml
index c179e4ec4..255ad49ae 100644
--- a/pom.xml
+++ b/pom.xml
@@ -499,7 +499,7 @@
     <project.oauth.version>1.34.1</project.oauth.version>
     <project.jsr305.version>3.0.2</project.jsr305.version>
     <project.gson.version>2.8.6</project.gson.version>
-    <project.protobuf-java.version>3.21.8</project.protobuf-java.version>
+    <project.protobuf-java.version>3.21.9</project.protobuf-java.version>
     <project.guava.version>31.1-jre</project.guava.version>
     <project.appengine.version>2.0.8</project.appengine.version>
     <project.xpp3.version>1.1.4c</project.xpp3.version>