diff --git a/Dockerfile b/Dockerfile
index 93a3909..775b5c1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ghcr.io/hadolint/hadolint:v2.14.0-debian
+FROM ghcr.io/hadolint/hadolint:v2.14.0-debian@sha256:158cd0184dcaa18bd8ec20b61f4c1cabdf8b32a592d062f57bdcb8e4c1d312e2
 
 COPY LICENSE README.md problem-matcher.json /
 COPY hadolint.sh /usr/local/bin/hadolint.sh