diff --git a/Dockerfile b/Dockerfile
index b166491..7a61d83 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:14-alpine
+FROM docker.io/library/node:14-alpine@sha256:dc92f36e7cd917816fa2df041d4e9081453366381a00f40398d99e9392e78664
 
 # Install Linux packages
 RUN apk add -U --no-cache wireguard-tools dumb-init