diff --git a/Dockerfile b/Dockerfile
index ccee422..842fb7d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -18,7 +18,13 @@ WORKDIR /app
 # Install all workspaces (also fetches puppeteer's Chromium + better-sqlite3 prebuilt
 # binary for linux-x64), then build the web UI and bundle the server.
 COPY . .
-RUN npm install \
+# package-lock.json is generated on Windows dev machines; npm's optional-dependency
+# resolution has a known bug (npm/cli#4828) where a lockfile from one platform doesn't
+# pull in another platform's native binaries (here, @rollup/rollup-linux-x64-gnu) even
+# though npm install runs fresh in this (Linux) container. Dropping the lockfile before
+# install forces a same-platform resolve.
+RUN rm -f package-lock.json \
+ && npm install \
  && npm run build --workspace @sims/hq-web \
  && npm run build --workspace @sims/hq