diff --git a/.github/workflows/pythonapp.yml b/.github/workflows/pythonapp.yml
index f0d92844..7ca57fba 100644
--- a/.github/workflows/pythonapp.yml
+++ b/.github/workflows/pythonapp.yml
@@ -55,6 +55,7 @@ jobs:
     - name: Install basic dependencies
       run: |
         python -m pip install -e .[tests] -f https://download.pytorch.org/whl/torch_stable.html
+        python -m pip install "numpy<2.0"
     - name: Test with older SKLearn on Linux with py3.9 to check backward compatibility
       if: ${{ matrix.python-version == '3.9' && startsWith(matrix.os, 'ubuntu') == true }}
       run: python -m pip install scikit-learn==1.2.1 numpy==1.26.4