diff --git a/docs/deployment/docker.md b/docs/deployment/docker.md
index 095a4989d8..1221ac1f87 100644
--- a/docs/deployment/docker.md
+++ b/docs/deployment/docker.md
@@ -60,15 +60,16 @@ FROM node:14-buster-slim
 
 WORKDIR /app
 
-# Copy repo skeleton first, to avoid unnecessary docker cache invalidation.
 # The skeleton contains the package.json of each package in the monorepo,
 # and along with yarn.lock and the root package.json, that's enough to run yarn install.
-ADD yarn.lock package.json packages/backend/dist/skeleton.tar.gz ./
+COPY yarn.lock package.json packages/backend/dist/skeleton.tar.gz ./
+RUN tar xzf skeleton.tar.gz && rm skeleton.tar.gz
 
 RUN yarn install --frozen-lockfile --production --network-timeout 300000 && rm -rf "$(yarn cache dir)"
 
 # Then copy the rest of the backend bundle, along with any other files we might want.
-ADD packages/backend/dist/bundle.tar.gz app-config.yaml ./
+COPY packages/backend/dist/bundle.tar.gz app-config.yaml ./
+RUN tar xzf bundle.tar.gz && rm bundle.tar.gz
 
 CMD ["node", "packages/backend", "--config", "app-config.yaml"]
 ```