diff --git a/Dockerfile b/Dockerfile
index 5cf690d..306811c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # build environment ###########################################
-FROM golang:1.21.0-alpine@sha256:445f34008a77b0b98bf1821bf7ef5e37bb63cc42d22ee7c21cc17041070d134f AS build-env
+FROM golang:1.21.1-alpine@sha256:96634e55b363cb93d39f78fb18aa64abc7f96d372c176660d7b8b6118939d97b AS build-env
 
 WORKDIR /app