diff --git a/.ci_support/environment-docs.yml b/.ci_support/environment-docs.yml
index 0b436b333..2f44e9038 100644
--- a/.ci_support/environment-docs.yml
+++ b/.ci_support/environment-docs.yml
@@ -10,7 +10,7 @@ dependencies:
 - cloudpickle =3.1.0
 - gitpython =3.1.43
 - h5io_browser =0.1.4
-- h5py =3.11.0
+- h5py =3.12.1
 - jinja2 =3.1.4
 - monty =2024.7.30
 - numpy =2.1.2
diff --git a/.ci_support/environment-mini.yml b/.ci_support/environment-mini.yml
index 8c73dffde..4b947718e 100644
--- a/.ci_support/environment-mini.yml
+++ b/.ci_support/environment-mini.yml
@@ -3,7 +3,7 @@ channels:
 dependencies:
 - cloudpickle =3.1.0
 - h5io_browser =0.1.4
-- h5py =3.11.0
+- h5py =3.12.1
 - monty =2024.7.30
 - numpy =2.1.2
 - pandas =2.2.3
diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index 0fb9ee212..013981a9e 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -8,7 +8,7 @@ dependencies:
 - cloudpickle =3.1.0
 - gitpython =3.1.43
 - h5io_browser =0.1.4
-- h5py =3.11.0
+- h5py =3.12.1
 - jinja2 =3.1.4
 - monty =2024.7.30
 - numpy =2.1.2
diff --git a/binder/environment.yml b/binder/environment.yml
index 0ab04a8e4..6ba75f220 100644
--- a/binder/environment.yml
+++ b/binder/environment.yml
@@ -7,7 +7,7 @@ dependencies:
 - cloudpickle =3.1.0
 - gitpython =3.1.43
 - h5io_browser =0.1.4
-- h5py =3.11.0
+- h5py =3.12.1
 - jinja2 =3.1.4
 - monty =2024.7.30
 - numpy =2.1.2
diff --git a/pyproject.toml b/pyproject.toml
index 0c720db5f..e60f788cf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ dependencies = [
     "cloudpickle==3.1.0",
     "executorlib==0.0.4",
     "h5io_browser==0.1.4",
-    "h5py==3.11.0",
+    "h5py==3.12.1",
     "numpy==2.1.2",
     "monty==2024.7.30",
     "pandas==2.2.3",