diff --git a/Dockerfile b/Dockerfile
index b72b51a..10f9f0f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.18
+FROM alpine:3.18@sha256:eece025e432126ce23f223450a0326fbebde39cdf496a85d8c016293fc851978
 
 LABEL \
   org.label-schema.name="docker-bench-security" \