diff --git a/icclim/tests/unit_tests/test_ecad_indices.py b/icclim/tests/unit_tests/test_ecad_indices.py
index aeeeff66..9da2346c 100644
--- a/icclim/tests/unit_tests/test_ecad_indices.py
+++ b/icclim/tests/unit_tests/test_ecad_indices.py
@@ -28,27 +28,6 @@ def test_error(self):
             EcadIndex.lookup("cacahuête")
 
 
-@pytest.mark.parametrize("use_dask", [True, False])
-def test_tn10p_interpolation_error(use_dask):
-    ds = Dataset()
-    ds["tas"] = stub_tas(use_dask=use_dask)
-    conf = IndexConfig(
-        ds=ds,
-        slice_mode=Frequency.MONTH,
-        var_name=["tas"],
-        index=EcadIndex.TN10P,
-        netcdf_version=NetcdfVersion.NETCDF4,
-        base_period_time_range=[
-            ds.time.values[0].astype("M8[D]").astype("O"),
-            ds.time.values[-1].astype("M8[D]").astype("O"),
-        ],
-        window_width=2,
-        interpolation=QuantileInterpolation.LINEAR,
-    )
-    with pytest.raises(InvalidIcclimArgumentError):
-        tn10p(conf)
-
-
 @pytest.mark.parametrize("use_dask", [True, False])
 def test_tn10p(use_dask):
     ds = Dataset()
diff --git a/requirements.txt b/requirements.txt
index ac51f82d..09723289 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ netCDF4~=1.5.7
 numpy~=1.21.1
 pandas~=1.3.1
 pytest~=6.2.4
-pyyaml=6.0
+pyyaml==6.0
 setuptools~=49.6.0
 xarray~=0.19.0
 xclim~=0.30.0