diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 544b244..dc89513 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,6 +22,10 @@ jobs:
         include:
           - os: "ubuntu-latest"
             python-version: '3.8'  # first supported
+          - os: "windows-latest"
+            python-version: '3.8'  # first supported
+          - os: "macos-latest"
+            python-version: '3.8'  # first supported
           - os: "ubuntu-latest"
             python-version: '3.12'  # latest supported
           - os: "windows-latest"
@@ -38,7 +42,7 @@ jobs:
           miniconda-version: "latest"
           auto-update-conda: true
           python-version: ${{ matrix.python-version }}
-          environment-file: environment.yml
+          #environment-file: environment.yml
           activate-environment: pygeogrids
           auto-activate-base: false
       - name: Print environment infos
diff --git a/setup.cfg b/setup.cfg
index ac9f41f..6f3beb3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -36,6 +36,7 @@ install_requires =
     netCDF4
     pyproj
     pykdtree
+    scipy
 # The usage of test_requires is discouraged, see `Dependency Management` docs
 tests_require = pytest; pytest-cov
 # Require a specific Python version, e.g. Python 2.7 or >= 3.4
diff --git a/tests/test_grid.py b/tests/test_grid.py
index 042d6f1..4f7a391 100644
--- a/tests/test_grid.py
+++ b/tests/test_grid.py
@@ -153,13 +153,15 @@ def test_nearest_neighbor_max_dist(self):
         assert lat == 18.5
 
         # test with maxdist lower than nearest point
-        gpi, dist = self.grid.find_nearest_gpi(14.3, 18.5, max_dist=10000)
+        with pytest.warns(UserWarning):
+            gpi, dist = self.grid.find_nearest_gpi(14.3, 18.5, max_dist=10000)
         assert gpi == np.iinfo(np.int32).max
         assert dist == np.inf
 
         # test with custom gpi, see issue #68
         grid = grids.BasicGrid(lon=[16,17], lat=[45,46], gpis=[100,200])
-        gpi, dist = grid.find_nearest_gpi(0,0, max_dist=1000)
+        with pytest.warns(UserWarning):
+            gpi, dist = grid.find_nearest_gpi(0,0, max_dist=1000)
         assert gpi == np.iinfo(np.int32).max
         assert dist == np.inf