diff --git a/Makefile b/Makefile
index fe48b7905a..fa00a49f6a 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ SIMAPP = ./app
 
 # for dockerized protobuf tools
 DOCKER := $(shell which docker)
-BUF_IMAGE=bufbuild/buf:1.0.0-rc8
+BUF_IMAGE=bufbuild/buf@sha256:3cb1f8a4b48bd5ad8f09168f10f607ddc318af202f5c057d52a45216793d85e5 #v1.4.0
 DOCKER_BUF := $(DOCKER) run --rm -v $(CURDIR):/workspace --workdir /workspace $(BUF_IMAGE)
 HTTPS_GIT := https://github.com/CosmWasm/wasmd.git