diff --git a/grpc/protobuf/go.mod b/grpc/protobuf/go.mod
index eb0c21f..473aef0 100644
--- a/grpc/protobuf/go.mod
+++ b/grpc/protobuf/go.mod
@@ -6,5 +6,5 @@ require (
 	github.com/golang/protobuf v1.5.3
 	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/jeffotoni/goexample v0.0.0-20190816163208-981c621062cb
-	google.golang.org/protobuf v1.30.0 // indirect
+	google.golang.org/protobuf v1.33.0 // indirect
 )
diff --git a/grpc/protobuf/go.sum b/grpc/protobuf/go.sum
index 2e50338..2ec378c 100644
--- a/grpc/protobuf/go.sum
+++ b/grpc/protobuf/go.sum
@@ -9,5 +9,5 @@ github.com/jeffotoni/goexample v0.0.0-20190816163208-981c621062cb/go.mod h1:MSTO
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.30.0 h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=
-google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
+google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=