diff --git a/.ci_support/environment-docs.yml b/.ci_support/environment-docs.yml
index 0b6ba448..ce23f011 100644
--- a/.ci_support/environment-docs.yml
+++ b/.ci_support/environment-docs.yml
@@ -14,4 +14,4 @@ dependencies:
 - flux-core
 - jupyter-book =1.0.0
 - h5py =3.11.0
-- h5io =0.2.2
\ No newline at end of file
+- h5io =0.2.3
\ No newline at end of file
diff --git a/.ci_support/environment-mpich.yml b/.ci_support/environment-mpich.yml
index add01b08..0dfa83f1 100644
--- a/.ci_support/environment-mpich.yml
+++ b/.ci_support/environment-mpich.yml
@@ -9,4 +9,4 @@ dependencies:
 - tqdm =4.66.4
 - pyzmq =26.0.3
 - h5py =3.11.0
-- h5io =0.2.2
+- h5io =0.2.3
diff --git a/.ci_support/environment-openmpi.yml b/.ci_support/environment-openmpi.yml
index 34f4aae8..2f860fe9 100644
--- a/.ci_support/environment-openmpi.yml
+++ b/.ci_support/environment-openmpi.yml
@@ -9,4 +9,4 @@ dependencies:
 - tqdm =4.66.4
 - pyzmq =26.0.3
 - h5py =3.11.0
-- h5io =0.2.2
+- h5io =0.2.3
diff --git a/.ci_support/environment-win.yml b/.ci_support/environment-win.yml
index 56bff2ca..a9015a80 100644
--- a/.ci_support/environment-win.yml
+++ b/.ci_support/environment-win.yml
@@ -9,4 +9,4 @@ dependencies:
 - tqdm =4.66.4
 - pyzmq =26.0.3
 - h5py =3.11.0
-- h5io =0.2.2
\ No newline at end of file
+- h5io =0.2.3
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 94d3e709..120a7cb5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -39,7 +39,7 @@ Repository = "https://github.com/pyiron/pympipool"
 mpi = ["mpi4py==3.1.6"]
 hdf = [
     "h5py==3.11.0",
-    "h5io==0.2.2",
+    "h5io==0.2.3",
 ]
 
 [tool.setuptools.packages.find]