diff --git a/.ci_support/environment-win.yml b/.ci_support/environment-win.yml
index a7356492..6b93f026 100644
--- a/.ci_support/environment-win.yml
+++ b/.ci_support/environment-win.yml
@@ -5,6 +5,6 @@ dependencies:
 - numpy
 - msmpi
 - cloudpickle =2.2.1
-- mpi4py =3.1.4
+- mpi4py =3.1.5
 - tqdm =4.66.1
 - pyzmq =24.0.1