diff --git a/internal/gapicgen/cmd/genbot/Dockerfile b/internal/gapicgen/cmd/genbot/Dockerfile
index d69f025..00b23d9 100644
--- a/internal/gapicgen/cmd/genbot/Dockerfile
+++ b/internal/gapicgen/cmd/genbot/Dockerfile
@@ -29,7 +29,7 @@
 
 # Install Go tools.
 RUN GO111MODULE=on go get \
-    github.com/golang/protobuf/protoc-gen-go@v1.4.2 \
+    github.com/golang/protobuf/protoc-gen-go@v1.4.3 \
     golang.org/x/lint/golint@latest \
     golang.org/x/tools/cmd/goimports@latest \
     honnef.co/go/tools/cmd/staticcheck@latest \