diff --git a/grpc-google-iam-v1/build.gradle b/grpc-google-iam-v1/build.gradle
index 49b1f4b1..3051db23 100644
--- a/grpc-google-iam-v1/build.gradle
+++ b/grpc-google-iam-v1/build.gradle
@@ -19,7 +19,7 @@ repositories {
 
 dependencies {
   compile 'io.grpc:grpc-stub:1.40.1'
-  compile 'io.grpc:grpc-protobuf:1.23.0'
+  compile 'io.grpc:grpc-protobuf:1.40.1'
   compile project(':proto-google-iam-v1')
 }