GeezerVison

    def get_active_overrides() -> GlobalOverrides:
42503
        """Get the currently active GlobalOverrides instance.
42504
    
42505
        If no context is active, creates one from the current environment
42506
        using SETUPTOOLS_SCM prefix for legacy compatibility.
42507
    
42508
        Note: The auto-created instance reads from os.environ at call time,
42509
        so it will pick up environment changes (e.g., from pytest monkeypatch).
42510
    
42511
        Returns:
42512
            GlobalOverrides instance
42513
        """
42514
        global _auto_create_warning_issued
42515
    
42516
        overrides = _active_overrides.get()
42517
        if overrides is None:
42518
            # Auto-create context from environment for backwards compatibility
42519
            # Note: We create a fresh instance each time to pick up env changes
42520
            if not _auto_create_warning_issued:
42521
>               warnings.warn(
42522
                    "No GlobalOverrides context is active. "
42523
                    "Auto-creating one with SETUPTOOLS_SCM prefix for backwards compatibility. "
42524
                    "Consider using 'with GlobalOverrides.from_env(\"YOUR_TOOL\"):' explicitly.",
42525
                    UserWarning,
42526
                    stacklevel=2,
42527
                )
42528
E               UserWarning: No GlobalOverrides context is active. Auto-creating one with SETUPTOOLS_SCM prefix for backwards compatibility. Consider using 'with GlobalOverrides.from_env("YOUR_TOOL"):' explicitly.

diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
index b4f3cc7d21..137a6bd760 100644
--- a/lib/matplotlib/__init__.py
+++ b/lib/matplotlib/__init__.py
@@ -227,7 +227,7 @@ def _get_version():
             return setuptools_scm.get_version(
                 root=root,
                 dist_name="matplotlib",
-                version_scheme="release-branch-semver",
+                version_scheme="semver-pep440-release-branch",
                 local_scheme="node-and-date",
                 fallback_version=_version.version,
             )
diff --git a/pyproject.toml b/pyproject.toml
index 112528dc9d..74a3af9fe2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -82,7 +82,7 @@ requires = [
 install = ['--tags=data,python-runtime,runtime']
 
 [tool.setuptools_scm]
-version_scheme = "release-branch-semver"
+version_scheme = "semver-pep440-release-branch"
 local_scheme = "node-and-date"
 parentdir_prefix_version = "matplotlib-"
 fallback_version = "0.0+UNKNOWN"