diff --git a/Dockerfile b/Dockerfile
index d389ca0..249862d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:12-alpine
+FROM node:12-alpine@sha256:1c5f444d75cc3ed4e3dee50f07aa66eba616c45217d6c8600819e4b245b8215e
 
 LABEL maintainer="Robert Kaussow <mail@thegeeklab.de>"
 LABEL org.opencontainers.image.authors="Robert Kaussow <mail@thegeeklab.de>"