diff --git a/Dockerfile b/Dockerfile
index 7200d95a1a..ba2f00eaa3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -186,7 +186,8 @@ WORKDIR /ragflow
 # Install build-only dependencies for compiling Python C extensions.
 # These are not inherited from base to keep the production image smaller.
 RUN --mount=type=cache,id=ragflow_apt,target=/var/cache/apt,sharing=locked \
-    apt install -y build-essential libpython3-dev libicu-dev libgbm-dev && \
+    apt-get update --fix-missing && \
+    apt-get install -y build-essential libpython3-dev libicu-dev libgbm-dev && \
     rm -rf /var/lib/apt/lists/*
 
 # install dependencies from uv.lock file