diff --git a/endpoints/bookstore-grpc/api/build.gradle b/endpoints/bookstore-grpc/api/build.gradle
index d10f6e82f9a..3456233d383 100644
--- a/endpoints/bookstore-grpc/api/build.gradle
+++ b/endpoints/bookstore-grpc/api/build.gradle
@@ -31,9 +31,9 @@ dependencies {
   repositories {
     mavenCentral()
   }
-  compile 'io.grpc:grpc-netty:1.0.1'
-  compile 'io.grpc:grpc-protobuf:1.0.1'
-  compile 'io.grpc:grpc-stub:1.0.1'
+  compile 'io.grpc:grpc-netty:1.40.1'
+  compile 'io.grpc:grpc-protobuf:1.40.1'
+  compile 'io.grpc:grpc-stub:1.40.1'
 }
 
 protobuf {