diff --git a/Dockerfile b/Dockerfile
index a5116ac..b2c27fa 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -49,16 +49,15 @@ COPY pyproject.toml uv.lock README.md ./
 COPY pixelle_video ./pixelle_video
 
 # Install Python dependencies using uv with configurable index URL
-# Auto-select China mirror when USE_CN_MIRROR=true and UV_INDEX_URL is default
-# Set longer timeout and use --default-index parameter to replace PyPI
-# Note: --default-index replaces PyPI as the default source
-RUN if [ "$USE_CN_MIRROR" = "true" ] && [ "$UV_INDEX_URL" = "https://pypi.tuna.tsinghua.edu.cn/simple" ]; then \
-        export UV_HTTP_TIMEOUT=300 && \
-        uv sync --frozen --no-dev --default-index https://pypi.tuna.tsinghua.edu.cn/simple; \
-    else \
-        export UV_HTTP_TIMEOUT=300 && \
-        uv sync --frozen --no-dev --default-index $UV_INDEX_URL; \
-    fi
+# Create uv.toml config file to force using the mirror (most reliable method)
+# Only create config when USE_CN_MIRROR=true, otherwise use default PyPI
+RUN if [ "$USE_CN_MIRROR" = "true" ]; then \
+        echo '[[index]]' > uv.toml && \
+        echo "url = \"$UV_INDEX_URL\"" >> uv.toml && \
+        echo 'default = true' >> uv.toml; \
+    fi && \
+    export UV_HTTP_TIMEOUT=300 && \
+    uv sync --frozen --no-dev
 
 # Copy rest of application code
 COPY api ./api