diff --git a/.binder/environment.yml b/.binder/environment.yml
index 584389bc..e27f7654 100644
--- a/.binder/environment.yml
+++ b/.binder/environment.yml
@@ -4,7 +4,7 @@ dependencies:
 - hatchling =1.30.1
 - hatch-vcs =0.5.0
 - python >=3.11, <3.15
-- pydantic =2.12.5
+- pydantic =2.13.4
 - pyiron_snippets =1.3.0
 - bagofholding =0.1.12
 - ipytree =0.2.2
diff --git a/.ci_support/environment.yml b/.ci_support/environment.yml
index b5501582..69cea888 100644
--- a/.ci_support/environment.yml
+++ b/.ci_support/environment.yml
@@ -4,5 +4,5 @@ dependencies:
 - hatchling =1.30.1
 - hatch-vcs =0.5.0
 - python >=3.11, <3.15
-- pydantic =2.12.5
+- pydantic =2.13.4
 - pyiron_snippets =1.3.0
diff --git a/docs/environment.yml b/docs/environment.yml
index cef52ee0..132a7ad6 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -10,7 +10,7 @@ dependencies:
 - hatchling =1.30.1
 - hatch-vcs =0.5.0
 - python >=3.11, <3.15
-- pydantic =2.12.5
+- pydantic =2.13.4
 - pyiron_snippets =1.3.0
 - bagofholding =0.1.12
 - ipytree =0.2.2
diff --git a/pyproject.toml b/pyproject.toml
index f370f05e..9dfeb879 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ classifiers = [
     "Programming Language :: Python :: 3.14",
 ]
 dependencies = [
-    "pydantic==2.12.5",
+    "pydantic==2.13.4",
     "pyiron_snippets==1.3.0",
 ]
 dynamic = [ "version",]