diff --git a/.ci_support/environment-docs.yml b/.ci_support/environment-docs.yml
index 8f92efb8..b6c7b3f1 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 =4.0.0
+- mpi4py =4.0.1
 - pyzmq =26.2.0
 - flux-core
 - jupyter-book =1.0.0
diff --git a/.ci_support/environment-mpich.yml b/.ci_support/environment-mpich.yml
index d402acd6..a9fab13d 100644
--- a/.ci_support/environment-mpich.yml
+++ b/.ci_support/environment-mpich.yml
@@ -5,7 +5,7 @@ dependencies:
 - numpy
 - mpich
 - cloudpickle =3.0.0
-- mpi4py =4.0.0
+- mpi4py =4.0.1
 - pyzmq =26.2.0
 - h5py =3.11.0
 - matplotlib =3.9.2
diff --git a/.ci_support/environment-openmpi.yml b/.ci_support/environment-openmpi.yml
index b0b1b347..ef890e4f 100644
--- a/.ci_support/environment-openmpi.yml
+++ b/.ci_support/environment-openmpi.yml
@@ -5,7 +5,7 @@ dependencies:
 - numpy
 - openmpi
 - cloudpickle =3.0.0
-- mpi4py =4.0.0
+- mpi4py =4.0.1
 - pyzmq =26.2.0
 - h5py =3.11.0
 - matplotlib =3.9.2
diff --git a/.ci_support/environment-win.yml b/.ci_support/environment-win.yml
index 95385c74..a3458868 100644
--- a/.ci_support/environment-win.yml
+++ b/.ci_support/environment-win.yml
@@ -5,7 +5,7 @@ dependencies:
 - numpy
 - msmpi
 - cloudpickle =3.0.0
-- mpi4py =4.0.0
+- mpi4py =4.0.1
 - pyzmq =26.2.0
 - h5py =3.11.0
 - matplotlib =3.9.2
diff --git a/pyproject.toml b/pyproject.toml
index a90c741c..6e0e6509 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,7 +35,7 @@ Documentation = "https://executorlib.readthedocs.io"
 Repository = "https://github.com/pyiron/executorlib"
 
 [project.optional-dependencies]
-mpi = ["mpi4py==4.0.0"]
+mpi = ["mpi4py==4.0.1"]
 hdf = [
     "h5py==3.11.0",
 ]