diff --git a/tox.ini b/tox.ini
index a636f84dc..d88f67ca9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -118,7 +118,6 @@ extras =
 deps =
     lmoments: lmoments3
     numpy: numpy>=1.20,<2.0
-    numpy: cf-xarray>=0.6.1,<0.9.2
     numpy: pint>=0.18,<0.24.0
     sbck: pybind11
     upstream: -r CI/requirements_upstream.txt