diff --git a/cmd/mygithub/Dockerfile b/cmd/mygithub/Dockerfile
index 420e26b..fb2a157 100644
--- a/cmd/mygithub/Dockerfile
+++ b/cmd/mygithub/Dockerfile
@@ -1,4 +1,4 @@
-FROM --platform=$BUILDPLATFORM golang:1.25.5-alpine AS builder
+FROM --platform=$BUILDPLATFORM golang:1.25.5-alpine@sha256:ac09a5f469f307e5da71e766b0bd59c9c49ea460a528cc3e6686513d64a6f1fb AS builder
 
 RUN apk add --no-cache -U git curl
 RUN sh -c "$(curl --location https://taskfile.dev/install.sh)" -- -d -b /usr/local/bin