diff --git a/.ci_support/environment-docs.yml b/.ci_support/environment-docs.yml
index 0dfafee2..21e246d2 100644
--- a/.ci_support/environment-docs.yml
+++ b/.ci_support/environment-docs.yml
@@ -11,7 +11,7 @@ dependencies:
 - sphinx
 - sphinx_rtd_theme
 - cloudpickle =3.1.2
-- h5py =3.15.1
+- h5py =3.16.0
 - jupyter-book =1.0.0
 - mpi4py =4.1.1
 - python =3.12
diff --git a/.ci_support/environment-integration.yml b/.ci_support/environment-integration.yml
index d3da6429..7a385e26 100644
--- a/.ci_support/environment-integration.yml
+++ b/.ci_support/environment-integration.yml
@@ -1,7 +1,7 @@
 channels:
 - conda-forge
 dependencies:
-- h5py =3.15.1
+- h5py =3.16.0
 - jupyter
 - mpi4py =4.1.1
 - numpy =2.3.5
diff --git a/.ci_support/environment-mpich.yml b/.ci_support/environment-mpich.yml
index 0e263a86..287288cc 100644
--- a/.ci_support/environment-mpich.yml
+++ b/.ci_support/environment-mpich.yml
@@ -5,7 +5,7 @@ dependencies:
 - numpy =2.4.2
 - mpich
 - cloudpickle =3.1.2
-- h5py =3.15.1
+- h5py =3.16.0
 - hatchling =1.29.0
 - hatch-vcs =0.5.0
 - ipython =9.9.0
diff --git a/.ci_support/environment-openmpi.yml b/.ci_support/environment-openmpi.yml
index ece45f3e..2ce531af 100644
--- a/.ci_support/environment-openmpi.yml
+++ b/.ci_support/environment-openmpi.yml
@@ -5,7 +5,7 @@ dependencies:
 - numpy =2.4.2
 - openmpi
 - cloudpickle =3.1.2
-- h5py =3.15.1
+- h5py =3.16.0
 - hatchling =1.29.0
 - hatch-vcs =0.5.0
 - ipython =9.9.0
diff --git a/.ci_support/environment-win.yml b/.ci_support/environment-win.yml
index c7e5cdb1..f7099b49 100644
--- a/.ci_support/environment-win.yml
+++ b/.ci_support/environment-win.yml
@@ -5,7 +5,7 @@ dependencies:
 - numpy =2.4.2
 - msmpi
 - cloudpickle =3.1.2
-- h5py =3.15.1
+- h5py =3.16.0
 - hatchling =1.29.0
 - hatch-vcs =0.5.0
 - ipython =9.9.0
diff --git a/binder/environment.yml b/binder/environment.yml
index 56d38c2e..2cdb7705 100644
--- a/binder/environment.yml
+++ b/binder/environment.yml
@@ -9,7 +9,7 @@ dependencies:
 - flux-pmix =0.6.0
 - hatchling =1.29.0
 - hatch-vcs =0.5.0
-- h5py =3.15.1
+- h5py =3.16.0
 - ipython =9.9.0
 - matplotlib =3.10.0
 - mpi4py =4.1.1
diff --git a/pyproject.toml b/pyproject.toml
index 38b095cd..ec6274ba 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ Documentation = "https://executorlib.readthedocs.io"
 Repository = "https://github.com/pyiron/executorlib"
 
 [project.optional-dependencies]
-cache = ["h5py==3.15.1"]
+cache = ["h5py==3.16.0"]
 graph = [
     "pygraphviz==1.14",
     "networkx==3.6.1",
@@ -53,7 +53,7 @@ graphnotebook = [
 mpi = ["mpi4py==4.1.1"]
 cluster = [
     "pysqa==0.3.5",
-    "h5py==3.15.1",
+    "h5py==3.16.0",
 ]
 validation = [
     "pydantic==2.12.5",
@@ -61,7 +61,7 @@ validation = [
 all = [
     "mpi4py==4.1.1",
     "pysqa==0.3.5",
-    "h5py==3.15.1",
+    "h5py==3.16.0",
     "pydantic==2.12.5",
     "pygraphviz==1.14",
     "networkx==3.6.1",