diff --git a/Dockerfile b/Dockerfile
index 532cc36b4..2b0a5e0f9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM node:9.2.0-alpine
+FROM node:9.2.0-alpine@sha256:e174cb4f00bd5aacfe798ad7ee6c2985adceade4f487a9532de2ce8a067f7365
 LABEL maintainer="https://github.com/verdaccio/verdaccio"
 
 RUN apk --no-cache add openssl && \