diff --git a/docs/TEMPLATE.md b/docs/TEMPLATE.md
index 7ff6a85..c67a82b 100644
--- a/docs/TEMPLATE.md
+++ b/docs/TEMPLATE.md
@@ -396,7 +396,7 @@ template-base
 Naming: a library repo is `lib-<name>-<py|ts|rs>` and an app repo is
 `template-<runtime>`; the registry package is `craftainer-<name>` on PyPI and
 crates.io and `@craftainer/<name>` on npm (`lib-crud-sdk-ts` publishes
-`@craftainer/crud-sdk`). Libraries declare `GPL-3.0-or-later` in their package
+`@craftainer/crud-sdk`). Libraries declare `GPL-3.0-only` in their package
 manifest; base itself ships the GPL v3 text in `LICENSE`.
 
 Each mid-layer template is an instance of base that is itself a template. It
diff --git a/pyproject.toml b/pyproject.toml
index dce1995..04fcccf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ name = "template-python-package"
 # real version, stamped into the build at release time without a commit.
 version = "0.0.0"
 description = "Template repository for publishable Python packages"
-license = "GPL-3.0-or-later"
+license = "GPL-3.0-only"
 readme = "README.md"
 requires-python = ">=3.14"
 dependencies = []