diff --git a/google-api-client-protobuf/pom.xml b/google-api-client-protobuf/pom.xml
index a1917d85d..896ad91c2 100644
--- a/google-api-client-protobuf/pom.xml
+++ b/google-api-client-protobuf/pom.xml
@@ -81,7 +81,7 @@
         <artifactId>maven-protoc-plugin</artifactId>
         <version>0.4.2</version>
         <configuration>
-          <protocArtifact>com.google.protobuf:protoc:${project.protobuf-java.version}-build2:exe:${os.detected.classifier}</protocArtifact>
+          <protocArtifact>com.google.protobuf:protoc:${project.protobuf-java.version}:exe:${os.detected.classifier}</protocArtifact>
         </configuration>
         <executions>
           <execution>
diff --git a/google-api-client/pom.xml b/google-api-client/pom.xml
index 3e0a94514..aa1c9073e 100644
--- a/google-api-client/pom.xml
+++ b/google-api-client/pom.xml
@@ -83,7 +83,7 @@
         <artifactId>maven-protoc-plugin</artifactId>
         <version>0.4.2</version>
         <configuration>
-          <protocArtifact>com.google.protobuf:protoc:${project.protobuf-java.version}-build2:exe:${os.detected.classifier}</protocArtifact>
+          <protocArtifact>com.google.protobuf:protoc:${project.protobuf-java.version}:exe:${os.detected.classifier}</protocArtifact>
         </configuration>
         <executions>
           <execution>
diff --git a/pom.xml b/pom.xml
index 0e5aad625..cfa3eebfa 100644
--- a/pom.xml
+++ b/pom.xml
@@ -499,7 +499,7 @@
     <project.gson.version>2.8.5</project.gson.version>
     <project.jackson-core-asl.version>1.9.13</project.jackson-core-asl.version>
     <project.jackson-core2.version>2.9.8</project.jackson-core2.version>
-    <project.protobuf-java.version>2.6.1</project.protobuf-java.version>
+    <project.protobuf-java.version>3.9.1</project.protobuf-java.version>
     <project.guava.version>28.0-android</project.guava.version>
     <project.appengine.version>1.9.64</project.appengine.version>
     <project.xpp3.version>1.1.4c</project.xpp3.version>