diff --git a/.ci_support/environment-mpich.yml b/.ci_support/environment-mpich.yml
index cba47606..e4d97ded 100644
--- a/.ci_support/environment-mpich.yml
+++ b/.ci_support/environment-mpich.yml
@@ -4,7 +4,7 @@ dependencies:
 - python
 - numpy
 - mpich
-- cloudpickle =2.2.1
+- cloudpickle =3.0.0
 - mpi4py =3.1.4
 - tqdm =4.66.1
 - pyzmq =25.1.1