diff --git a/pom.xml b/pom.xml
index 04c8fe30..63ab9894 100644
--- a/pom.xml
+++ b/pom.xml
@@ -67,6 +67,13 @@
 
   <dependencyManagement>
     <dependencies>
+      <dependency>
+        <groupId>com.google.protobuf</groupId>
+        <artifactId>protobuf-bom</artifactId>
+        <version>4.33.0</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-shared-dependencies</artifactId>