diff --git a/Dockerfile b/Dockerfile
index 55d4a93..e59ad21 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,11 @@
-FROM mhart/alpine-node:8
+FROM mhart/alpine-node:9
 
 WORKDIR /app
 COPY . /app
 
-RUN npm install
+RUN    rm -rf node_modules \
+    && rm package-lock.json \
+    && npm install
 
 EXPOSE 3000
 CMD ["node", "app.js"]