diff --git a/image/Dockerfile b/image/Dockerfile
index 79503375..425f3918 100644
--- a/image/Dockerfile
+++ b/image/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.21
+FROM alpine:3.24@sha256:28bd5fe8b56d1bd048e5babf5b10710ebe0bae67db86916198a6eec434943f8b
 
 RUN apk add --no-cache shadow shadow-subids iproute2