diff --git a/Dockerfile b/Dockerfile
index 6bdb300..ae9492b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:lts-alpine3.15
+FROM node:lts-alpine3.15@sha256:da7ef512955c906b6fa84a02295a56d0172b2eb57e09286ec7abc02cfbb4c726
 
 LABEL maintainer="Robert Kaussow <mail@thegeeklab.de>"
 LABEL org.opencontainers.image.authors="Robert Kaussow <mail@thegeeklab.de>"