diff --git a/qwen3_6_scripts/patch_ops.sh b/qwen3_6_scripts/patch_ops.sh
index 985b2744..2fcf91c6 100755
--- a/qwen3_6_scripts/patch_ops.sh
+++ b/qwen3_6_scripts/patch_ops.sh
@@ -57,8 +57,8 @@ for P in /usr/local/lib/python3.10/site-packages/transformers/models \
 done
 if [ -n "$TMODELS" ]; then
     # Base engine requires transformers 4.55.3 for Qwen3_5Config support
-    pip install transformers==4.55.3 -i https://pypi.tuna.tsinghua.edu.cn/simple --timeout 30 2>&1 || \
-        echo "[patch_ops] WARNING: transformers install failed (may already be correct version)"
+    pip install transformers==4.55.3 ninja -i https://pypi.tuna.tsinghua.edu.cn/simple --timeout 30 2>&1 || \
+        echo "[patch_ops] WARNING: pip install failed (may already be correct versions)"
     cp -r ./qwen3_5 "$TMODELS/" 2>/dev/null && echo "[patch_ops] qwen3_5 config copied" || true
     cp -r ./qwen3_5_moe "$TMODELS/" 2>/dev/null && echo "[patch_ops] qwen3_5_moe config copied" || true
     python3 ./patch_transformers_qwen3_5.py 2>&1 || echo "[patch_ops] WARNING: transformers patch failed (non-fatal)"