diff --git a/endpoints/bookstore-grpc/api/build.gradle b/endpoints/bookstore-grpc/api/build.gradle
index 0de5750a87a..e0e5d66c41f 100644
--- a/endpoints/bookstore-grpc/api/build.gradle
+++ b/endpoints/bookstore-grpc/api/build.gradle
@@ -22,7 +22,7 @@ buildscript {
     mavenCentral()
   }
   dependencies {
-    classpath 'com.google.protobuf:protobuf-gradle-plugin:0.9.1'
+    classpath 'com.google.protobuf:protobuf-gradle-plugin:0.9.3'
 
   }
 }
diff --git a/endpoints/getting-started-grpc/api/build.gradle b/endpoints/getting-started-grpc/api/build.gradle
index 043308707f8..a6d9d0a6142 100644
--- a/endpoints/getting-started-grpc/api/build.gradle
+++ b/endpoints/getting-started-grpc/api/build.gradle
@@ -22,7 +22,7 @@ buildscript {
     mavenCentral()
   }
   dependencies {
-    classpath 'com.google.protobuf:protobuf-gradle-plugin:0.9.1'
+    classpath 'com.google.protobuf:protobuf-gradle-plugin:0.9.3'
 
   }
 }