diff --git a/bumpchanges/utils.py b/bumpchanges/utils.py
index fce22d8..cbc44c9 100644
--- a/bumpchanges/utils.py
+++ b/bumpchanges/utils.py
@@ -8,6 +8,7 @@
 from collections import defaultdict
 from dataclasses import dataclass
 from pathlib import Path
+from typing import Union
 
 import semver
 
@@ -39,7 +40,7 @@ def tag_to_semver(tag: str) -> semver.version.Version:
     return semver.Version.parse(tag[1:])
 
 
-def version_to_tag_str(version: str | semver.version.Version) -> str:
+def version_to_tag_str(version: Union[str, semver.version.Version]) -> str:
     """Return the git tag associated with this version."""
     # _Do_ add leading `v`s. Versions numbers never have leading `v`s, tags
     # always have leading `v`s.
diff --git a/tests/test_aliases.py b/tests/test_aliases.py
index c6d3726..738ae8e 100644
--- a/tests/test_aliases.py
+++ b/tests/test_aliases.py
@@ -52,6 +52,8 @@ def test_alias_workflow(aliaser):
 
 def test_modified_releases(aliaser):
     """Test how new releases interact with the results."""
+    # pylint: disable=protected-access
+
     assert aliaser.compute_alias_action(2) == ("v2", "v2.1.0")
 
     # Act as if this GitHub release never existed
@@ -90,6 +92,8 @@ def test_modified_releases(aliaser):
 @pytest.mark.parametrize("release_pre", [True, False])
 def test_drafts_and_prereleases(aliaser, semver_pre, release_draft, release_pre):
     """Test that only non-drafts and full releases are eligible."""
+    # pylint: disable=protected-access
+
     base_version = semver.Version(3, 0, 0)
     if semver_pre:
         base_version = base_version.bump_prerelease()