diff --git a/betty/tests/_package/test_license_compatibility.py b/betty/tests/_package/test_license_compatibility.py
index 3650d37fe..50f0591af 100644
--- a/betty/tests/_package/test_license_compatibility.py
+++ b/betty/tests/_package/test_license_compatibility.py
@@ -45,7 +45,7 @@ def assert_is_compatible(self, package_license: dict[str, Any]) -> None:
 
     async def test_runtime_dependency_license_compatibility(self) -> None:
         """
-        Assert that all runtime dependencies have licenses compatible with the GPLv3, so we can legally bundle them.
+        Assert that all runtime dependencies have licenses compatible with the GNU General Public License, Version 3 or later, so we can legally bundle them.
         """
         seen_distribution_names: set[str] = set()
 
diff --git a/documentation/about/license.rst b/documentation/about/license.rst
index 43486b2f7..16cef8ec1 100644
--- a/documentation/about/license.rst
+++ b/documentation/about/license.rst
@@ -7,8 +7,12 @@ Betty is copyright Bart Feenstra and contributors, and released under the **GPL*
 - You may make changes to your copy of Betty
 - You may distribute Betty and your own changes, but you must do so under the exact same license, provide that license, and make your source code available.
 
-GNU General Public License, Version 3
--------------------------------------
+GNU General Public License, Version 3 or later
+----------------------------------------------
+
+Betty is released under the **GNU General Public License, Version 3**, **or any later version** of the
+GNU General Public License.
+
 .. seealso::
     `Read more <https://www.gnu.org/licenses/gpl-3.0.en.html>`_ about the **GNU General Public License, Version 3** (also known as the **GPL**).
 
diff --git a/pyproject.toml b/pyproject.toml
index e5ef2beeb..d030ec010 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -45,7 +45,7 @@ classifiers = [
     'Intended Audience :: Developers',
     'Intended Audience :: End Users/Desktop',
     'Intended Audience :: Science/Research',
-    'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
+    'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
     'Programming Language :: JavaScript',
     'Programming Language :: Python :: 3.11',
     'Programming Language :: Python :: 3.12',