diff --git a/.ci_support/environment-docs.yml b/.ci_support/environment-docs.yml
index a55559c2..4cbf96c5 100644
--- a/.ci_support/environment-docs.yml
+++ b/.ci_support/environment-docs.yml
@@ -8,7 +8,7 @@ dependencies:
 - numpy
 - openmpi
 - cloudpickle =3.0.0
-- mpi4py =3.1.5
+- mpi4py =3.1.6
 - tqdm =4.66.2
 - pyzmq =25.1.2
 - flux-core
diff --git a/.ci_support/environment-mpich.yml b/.ci_support/environment-mpich.yml
index ef5df3b9..b2f488f7 100644
--- a/.ci_support/environment-mpich.yml
+++ b/.ci_support/environment-mpich.yml
@@ -5,6 +5,6 @@ dependencies:
 - numpy
 - mpich
 - cloudpickle =3.0.0
-- mpi4py =3.1.5
+- mpi4py =3.1.6
 - tqdm =4.66.2
 - pyzmq =25.1.2
diff --git a/.ci_support/environment-openmpi.yml b/.ci_support/environment-openmpi.yml
index 63b62a53..c1208bf5 100644
--- a/.ci_support/environment-openmpi.yml
+++ b/.ci_support/environment-openmpi.yml
@@ -5,6 +5,6 @@ dependencies:
 - numpy
 - openmpi
 - cloudpickle =3.0.0
-- mpi4py =3.1.5
+- mpi4py =3.1.6
 - tqdm =4.66.2
 - pyzmq =25.1.2
diff --git a/.ci_support/environment-win.yml b/.ci_support/environment-win.yml
index af43ed93..a0fe41aa 100644
--- a/.ci_support/environment-win.yml
+++ b/.ci_support/environment-win.yml
@@ -5,6 +5,6 @@ dependencies:
 - numpy
 - msmpi
 - cloudpickle =3.0.0
-- mpi4py =3.1.5
+- mpi4py =3.1.6
 - tqdm =4.66.2
 - pyzmq =25.1.2
diff --git a/pyproject.toml b/pyproject.toml
index f6b3d458..e98ebe4a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ classifiers = [
 ]
 dependencies = [
     "cloudpickle==3.0.0",
-    "mpi4py==3.1.5",
+    "mpi4py==3.1.6",
     "pyzmq==25.1.2",
     "tqdm==4.66.2",
 ]