diff --git a/Dockerfile b/Dockerfile
index 9307e76..498938f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,9 +4,14 @@ FROM node:8.2
 RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 
+# use changes to package.json to force Docker not to use the cache
+# when we change our application's nodejs dependencies:
+ADD package.json /usr/src/app
+RUN npm install
+
 # Install app dependencies
 COPY . /usr/src/app
-RUN npm install && npm run build
+RUN npm run build
 
 VOLUME /usr/src/app/build