diff --git a/packages/element-web-module-api/Dockerfile b/packages/element-web-module-api/Dockerfile
index 93d2e32ab4..ec29b09bc5 100644
--- a/packages/element-web-module-api/Dockerfile
+++ b/packages/element-web-module-api/Dockerfile
@@ -8,7 +8,10 @@ RUN apk add --no-cache jq
 
 WORKDIR /app
 COPY package.json yarn.lock ./
-COPY ./$BUILD_CONTEXT/package.json ./$BUILD_CONTEXT/
+# Copy the package.json files of all modules & packages to ensure the frozen workspace lockfile holds up
+RUN --mount=type=bind,target=/docker-context \
+    cd /docker-context/; \
+    find . -path ./node_modules -prune -o -name "package.json" -mindepth 0 -maxdepth 4 -exec cp --parents "{}" /app/ \;
 RUN yarn install --frozen-lockfile --ignore-scripts
 COPY tsconfig.json ./
 COPY ./$BUILD_CONTEXT ./$BUILD_CONTEXT