diff --git a/.github/workflows/test_branches.yml b/.github/workflows/test_branches.yml
index 55f903a37f9..a15240194f2 100644
--- a/.github/workflows/test_branches.yml
+++ b/.github/workflows/test_branches.yml
@@ -92,7 +92,7 @@ jobs:
           skip_doctest: 1
           TARGET: linux
           PYENV: conda
-          PACKAGES: mpi4py
+          PACKAGES: mpi4py==3.1.5
 
         - os: ubuntu-latest
           python: '3.10'
diff --git a/.github/workflows/test_pr_and_main.yml b/.github/workflows/test_pr_and_main.yml
index 28c72541a13..9eb6d362bb8 100644
--- a/.github/workflows/test_pr_and_main.yml
+++ b/.github/workflows/test_pr_and_main.yml
@@ -93,7 +93,7 @@ jobs:
           skip_doctest: 1
           TARGET: linux
           PYENV: conda
-          PACKAGES: mpi4py
+          PACKAGES: mpi4py==3.1.5
 
         - os: ubuntu-latest
           python: '3.11'