diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index a8ca7b7..287f61d 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -27,10 +27,13 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install --upgrade numpy
         pip install torch==${{ matrix.torch-version }}
         python -m pip install flake8 black
         if [ -f requirements-dev.txt ]; then pip install -r requirements-dev.txt; fi
+    - name: numpy downgrade
+      if: matrix.torch-version == "1.13.1"
+      run: |
+        pip install "numpy<2"
     - name: Lint check with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names