diff --git a/Dockerfile b/Dockerfile
index 75df15492..47ef161e4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -154,7 +154,9 @@ RUN --mount=type=cache,id=ragflow_uv,target=/root/.cache/uv,sharing=locked \
     else \
         sed -i 's|pypi.tuna.tsinghua.edu.cn|pypi.org|g' uv.lock; \
     fi; \
-    uv sync --python 3.12 --frozen
+    uv sync --python 3.12 --frozen && \
+    # Ensure pip is available in the venv for runtime package installation (fixes #12651)
+    .venv/bin/python3 -m ensurepip --upgrade
 
 COPY web web
 COPY docs docs