diff --git a/go.mod b/go.mod
index 81c01fc..6f3479e 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@ require (
 	github.com/DATA-DOG/go-sqlmock v1.3.3 // indirect
 	github.com/gofrs/uuid v3.2.0+incompatible // indirect
 	github.com/gogo/protobuf v1.2.1
-	github.com/golang/protobuf v1.3.2
+	github.com/golang/protobuf v1.3.4
 	github.com/grpc-ecosystem/grpc-gateway v1.9.6
 	github.com/izumin5210/grapi v0.5.0
 	github.com/kat-co/vala v0.0.0-20170210184112-42e1d8b61f12
diff --git a/go.sum b/go.sum
index ad15b09..90346e5 100644
--- a/go.sum
+++ b/go.sum
@@ -36,6 +36,8 @@ github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfb
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.4 h1:87PNWwrRvUSnqS4dlcBU/ftvOIBep4sYuBLlh6rX2wk=
+github.com/golang/protobuf v1.3.4/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
 github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=