diff --git a/ci/requirements-tests.txt b/ci/requirements-tests.txt
index 04f86a3..062ac19 100644
--- a/ci/requirements-tests.txt
+++ b/ci/requirements-tests.txt
@@ -19,7 +19,6 @@ packaging==20.3           # via pytest
 pandas==1.0.3             # via xarray
 pep8==1.7.1               # via pytest-pep8
 pluggy==0.13.1            # via pytest
-py==1.11.0                # via pytest
 pycparser==2.20           # via cffi
 pyflakes==2.2.0           # via pytest-flakes
 pyparsing==2.4.7          # via packaging