diff --git a/Dockerfile b/Dockerfile
index 27cd035f82..aba74318a9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -226,6 +226,10 @@ RUN --mount=type=cache,id=ragflow_uv,target=/root/.cache/uv,sharing=locked \
 # Install frontend dependencies — depends only on package manifests so
 # web source / docs changes don't invalidate this layer.
 COPY web/package.json web/package-lock.json web/.npmrc ./web/
+# The `prepare` lifecycle script (npm install) runs `node scripts/prepare.js`,
+# so that file must be present before `npm install` or the build fails with
+# "Cannot find module '/ragflow/web/scripts/prepare.js'".
+COPY web/scripts ./web/scripts
 RUN --mount=type=cache,id=ragflow_npm,target=/root/.npm,sharing=locked \
     cd web && NODE_OPTIONS="--max-old-space-size=8192" npm install