diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 6f7521e..5b64c90 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -40,7 +40,7 @@ repos:
 
 
 -   repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: "v0.15.12"
+    rev: "v0.16.1"
     hooks:
     -   id: ruff-check
         types: [file, python]
@@ -49,7 +49,7 @@ repos:
         types: [file, python]
 
 -   repo: https://github.com/codespell-project/codespell
-    rev: "v2.4.2"
+    rev: "v2.4.3"
     hooks:
     -   id: codespell
         types_or: [asciidoc, python, markdown, rst]
@@ -58,7 +58,7 @@ repos:
 
 
 -   repo: https://github.com/pycqa/isort
-    rev: '9.0.0a3'
+    rev: '8.0.1'
     hooks:
     -   id: isort
         name: isort (cython)
@@ -72,7 +72,7 @@ repos:
       types: [file, python]
 
 -   repo: https://github.com/pre-commit/mirrors-mypy
-    rev: 'v1.20.2'
+    rev: 'v2.3.0'
     hooks:
     -   id: mypy
         exclude: 'noxfile\.py|docs/conf\.py'
@@ -84,7 +84,7 @@ repos:
     - id: validate-pyproject
 
 -   repo: https://github.com/scientific-python/cookie
-    rev: 2026.04.04
+    rev: 2026.06.18
     hooks:
     - id: sp-repo-review
       additional_dependencies: ["repo-review[cli]"]
diff --git a/pyproject.toml b/pyproject.toml
index 9adc4f4..9a8030c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -232,6 +232,9 @@ ignore = [
         "D212",  # Multi-line docstring summary should start at the first line
     ]
 
+[tool.ruff.lint.flake8-copyright]
+notice-rgx = "(?i)copyright.*python-stratify contributors"
+
 [tool.ruff.lint.isort]
 force-sort-within-sections = true
 # Change to match specific package name:
diff --git a/setup.py b/setup.py
index 964cba9..b45b91f 100644
--- a/setup.py
+++ b/setup.py
@@ -1,3 +1,7 @@
+# Copyright python-stratify contributors
+#
+# This file is part of python-stratify and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 import os
 from pathlib import Path
 import sys
diff --git a/src/stratify/__init__.py b/src/stratify/__init__.py
index 8e8d518..a93ca9a 100644
--- a/src/stratify/__init__.py
+++ b/src/stratify/__init__.py
@@ -1,3 +1,7 @@
+# Copyright python-stratify contributors
+#
+# This file is part of python-stratify and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 from ._bounded_vinterp import interpolate_conservative  # noqa: F401
 from ._version import version as __version__  # noqa: F401
 from ._vinterp import *  # noqa: F403
diff --git a/src/stratify/_bounded_vinterp.py b/src/stratify/_bounded_vinterp.py
index 2c520d0..01367ac 100644
--- a/src/stratify/_bounded_vinterp.py
+++ b/src/stratify/_bounded_vinterp.py
@@ -1,3 +1,7 @@
+# Copyright python-stratify contributors
+#
+# This file is part of python-stratify and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 import numpy as np
 
 from ._conservative import conservative_interpolation
diff --git a/src/stratify/tests/__init__.py b/src/stratify/tests/__init__.py
index e69de29..41dc598 100644
--- a/src/stratify/tests/__init__.py
+++ b/src/stratify/tests/__init__.py
@@ -0,0 +1,4 @@
+# Copyright python-stratify contributors
+#
+# This file is part of python-stratify and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
diff --git a/src/stratify/tests/performance.py b/src/stratify/tests/performance.py
index 88e6616..48ff67b 100644
--- a/src/stratify/tests/performance.py
+++ b/src/stratify/tests/performance.py
@@ -1,3 +1,7 @@
+# Copyright python-stratify contributors
+#
+# This file is part of python-stratify and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 """Functions that may be used to measure performance of a component."""
 
 import dask.array as da
diff --git a/src/stratify/tests/test_bounded_vinterp.py b/src/stratify/tests/test_bounded_vinterp.py
index 06ba948..22100b8 100644
--- a/src/stratify/tests/test_bounded_vinterp.py
+++ b/src/stratify/tests/test_bounded_vinterp.py
@@ -1,3 +1,7 @@
+# Copyright python-stratify contributors
+#
+# This file is part of python-stratify and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 import unittest
 
 import numpy as np
diff --git a/src/stratify/tests/test_vinterp.py b/src/stratify/tests/test_vinterp.py
index 27ebb68..28262ad 100644
--- a/src/stratify/tests/test_vinterp.py
+++ b/src/stratify/tests/test_vinterp.py
@@ -1,3 +1,7 @@
+# Copyright python-stratify contributors
+#
+# This file is part of python-stratify and is released under the BSD license.
+# See LICENSE in the root of the repository for full licensing details.
 import unittest
 
 import dask.array as da