diff --git a/.goreleaser.Dockerfile b/.goreleaser.Dockerfile
index 5d4faa8..071d4c1 100644
--- a/.goreleaser.Dockerfile
+++ b/.goreleaser.Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1
+# syntax=docker/dockerfile:1@sha256:b6afd42430b15f2d2a4c5a02b919e98a525b785b1aaff16747d2f623364e39b6
 
 ## Setup stage
 FROM alpine:3.22.1@sha256:4bcff63911fcb4448bd4fdacec207030997caf25e9bea4045fa6c8c44de311d1 as builder
diff --git a/Dockerfile b/Dockerfile
index 1543d4b..1621956 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-# syntax=docker/dockerfile:1
+# syntax=docker/dockerfile:1@sha256:b6afd42430b15f2d2a4c5a02b919e98a525b785b1aaff16747d2f623364e39b6
 
 ## Build stage
 FROM golang:1.24.5-alpine@sha256:daae04ebad0c21149979cd8e9db38f565ecefd8547cf4a591240dc1972cf1399 as build