diff --git a/scripts/environment.yml b/scripts/environment.yml
index 057b852..9d5e2d3 100644
--- a/scripts/environment.yml
+++ b/scripts/environment.yml
@@ -34,7 +34,7 @@ dependencies:
 - scipy
 - h5py
 - numba
-- esmvaltool==2.8 # Pin esmvaltool version to 2.8
+- esmvaltool>=2.8,<2.9 # Pin esmvaltool version to 2.8
 - esmvaltool-python
 - esmvaltool-ncl
 - scikit-image