diff --git a/gax-java/pom.xml b/gax-java/pom.xml
index 82e5540fe8..b5428d20f3 100644
--- a/gax-java/pom.xml
+++ b/gax-java/pom.xml
@@ -170,7 +170,7 @@
       <dependency>
         <groupId>com.google.protobuf</groupId>
         <artifactId>protobuf-bom</artifactId>
-        <version>3.21.10</version>
+        <version>3.21.12</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>
diff --git a/java-iam/pom.xml b/java-iam/pom.xml
index 51e63248d1..9219a3b7f1 100644
--- a/java-iam/pom.xml
+++ b/java-iam/pom.xml
@@ -71,7 +71,7 @@
       <dependency>
         <groupId>com.google.protobuf</groupId>
         <artifactId>protobuf-bom</artifactId>
-        <version>3.21.9</version>
+        <version>3.21.12</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>