diff --git a/Dockerfile b/Dockerfile
index a77d944..07405e5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:20
+FROM node:20@sha256:66d2eb8b463114d1f416d61dbd5fa9cea83e8fc250feb997338467728a06124b
 
 ARG TZ
 ENV TZ="$TZ"