diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index c215738..8f62665 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,17 +1,17 @@
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
+    rev: v6.0.0
     hooks:
     -   id: check-merge-conflict
     -   id: debug-statements
     -   id: end-of-file-fixer
--   repo: https://github.com/asottile/reorder_python_imports
-    rev: v3.9.0
+-   repo: https://github.com/asottile/reorder-python-imports
+    rev: v3.15.0
     hooks:
     -   id: reorder-python-imports
         types: [python]
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
+    rev: v6.0.0
     hooks:
     -   id: check-added-large-files
         args: ['--maxkb=100']
@@ -27,7 +27,7 @@ repos:
         args: [--branch, main]
     -   id: trailing-whitespace
 -   repo: https://github.com/pre-commit/pygrep-hooks
-    rev: v1.9.0
+    rev: v1.10.0
     hooks:
     -   id: python-check-blanket-noqa
     -   id: python-check-mock-methods
@@ -39,18 +39,18 @@ repos:
     -   id: rst-inline-touching-normal
     -   id: text-unicode-replacement-char
 -   repo: https://github.com/asottile/blacken-docs
-    rev: v1.12.1
+    rev: 1.20.0
     hooks:
     -   id: blacken-docs
         additional_dependencies: [black==22.3.0]
         types: [rst]
 -   repo: https://github.com/psf/black
-    rev: 22.12.0
+    rev: 25.1.0
     hooks:
     -   id: black
         language_version: python3.10
 -   repo: https://github.com/PyCQA/flake8
-    rev: 5.0.4
+    rev: 7.3.0
     hooks:
     -   id: flake8
         types: [python]
@@ -71,7 +71,7 @@ repos:
             Pygments,
         ]
 -   repo: https://github.com/PyCQA/doc8
-    rev: v1.0.0
+    rev: v2.0.0
     hooks:
         -   id: doc8
 -   repo: meta
@@ -80,29 +80,29 @@ repos:
     -   id: check-useless-excludes
     # -   id: identity  # Prints all files passed to pre-commits. Debugging.
 -   repo: https://github.com/mgedmin/check-manifest
-    rev: "0.49"
+    rev: "0.50"
     hooks:
     -   id: check-manifest
 -   repo: https://github.com/PyCQA/doc8
-    rev: v1.0.0
+    rev: v2.0.0
     hooks:
     -   id: doc8
 -   repo: https://github.com/asottile/setup-cfg-fmt
-    rev: v2.2.0
+    rev: v2.8.0
     hooks:
     -   id: setup-cfg-fmt
 -   repo: https://github.com/econchick/interrogate
-    rev: 1.5.0
+    rev: 1.7.0
     hooks:
     -   id: interrogate
         args: [-v, --fail-under=20]
         exclude: ^(tests|docs|setup\.py)
 - repo: https://github.com/codespell-project/codespell
-  rev: v2.2.2
+  rev: v2.4.1
   hooks:
     -   id: codespell
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v3.3.1
+    rev: v3.20.0
     hooks:
     -   id: pyupgrade
         args: [--py37-plus]
diff --git a/setup.cfg b/setup.cfg
index 6edd072..5f7a973 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,11 +7,10 @@ url = https://github.com/OpenSourceEconomics/pybaum
 author = Janos Gabler, Tobias Raabe
 author_email = janos.gabler@gmail.com
 license = MIT
-license_file = LICENSE
+license_files = LICENSE
 platforms = unix, linux, osx, cygwin, win32
 classifiers =
     Development Status :: 3 - Alpha
-    License :: OSI Approved :: MIT License
     Operating System :: MacOS :: MacOS X
     Operating System :: Microsoft :: Windows
     Operating System :: POSIX
@@ -22,7 +21,7 @@ classifiers =
 
 [options]
 packages = find:
-python_requires = >=3.7
+python_requires = >=3.9
 include_package_data = True
 package_dir =
     =src
diff --git a/src/pybaum/equality.py b/src/pybaum/equality.py
index 9c36b3c..c5795dd 100644
--- a/src/pybaum/equality.py
+++ b/src/pybaum/equality.py
@@ -1,4 +1,5 @@
 """Functions to check equality of pytree leaves."""
+
 from pybaum.config import IS_JAX_INSTALLED
 from pybaum.config import IS_NUMPY_INSTALLED
 from pybaum.config import IS_PANDAS_INSTALLED
diff --git a/src/pybaum/tree_util.py b/src/pybaum/tree_util.py
index 769fcfe..8e79c07 100644
--- a/src/pybaum/tree_util.py
+++ b/src/pybaum/tree_util.py
@@ -6,6 +6,7 @@
 - The treedef containing information to unflatten pytrees is implemented differently.
 
 """
+
 from pybaum.equality import EQUALITY_CHECKERS
 from pybaum.registry import get_registry
 from pybaum.typecheck import get_type