diff --git a/environment.yml b/environment.yml
index 3df685d..3d7a342 100644
--- a/environment.yml
+++ b/environment.yml
@@ -11,7 +11,7 @@ dependencies:
 - sqlalchemy<2.0 ### cosima cookbook does not import with sqlalchemy 2
 - libnetcdf>=4.7.4=mpi_openmpi* # pinned for solver stability
 - coecms-nci
-- cdo>=1.9.5 # pinned for solver stability
+- cdo<2.1.1
 - hdf5
  #x basemap # Deprecated, see https://matplotlib.org/basemap/users/intro.html#deprecation-notice
  #x basemap-data-hires