diff --git a/bob_party/Dockerfile b/bob_party/Dockerfile
index c794cb3..e72937a 100644
--- a/bob_party/Dockerfile
+++ b/bob_party/Dockerfile
@@ -7,7 +7,8 @@ FROM node:latest
 # where available (npm@5+)
 COPY bob_party/package*.json ./
 
-RUN yarn
+RUN yarn install --frozen-lockfile
+
 # If you are building your code for production
 # RUN npm ci --only=production