diff --git a/environment.yml b/environment.yml
index d230553073..6a1bdf0562 100644
--- a/environment.yml
+++ b/environment.yml
@@ -53,7 +53,7 @@ dependencies:
   - psy-reg >=1.5.0
   - psy-simple >=1.5.0
   - pyproj >=2.1
-  - pys2index  # only from conda-forge
+  # - pys2index  # only from conda-forge  # not py313 compat
   - python >=3.10
   - python-cdo
   - python-dateutil