diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index d348b59f5..7ba107995 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -4,7 +4,7 @@ dependencies:
 - coveralls
 - coverage
 - codacy-coverage
-- dill =0.3.6
+- cloudpickle =2.2.1
 - gitpython =3.1.31
 - h5io =0.1.8
 - h5py =3.9.0