diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 7015232..4720568 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -26,7 +26,7 @@ jobs:
       run: |
         sudo apt update \
         && sudo apt install nco cdo libeccodes-tools \
-        && python -m pip install --upgrade pip cdsapi cfgrib eccodes MetPy tqdm xarray numpy netCDF4 pytest
+        && python -m pip install --upgrade pip cdsapi cfgrib eccodes MetPy tqdm xarray numpy<2 netCDF4 pytest
 
     - name: Run tests
       timeout-minutes: 25