diff --git a/.gitignore b/.gitignore
index 2a719ef..6b03f54 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,7 @@
 .bitrot.db
 .bitrot.sha512
+
+_version.py
+
+__pycache__
+*.egg-info
diff --git a/pyproject.toml b/pyproject.toml
index 11ff6b6..5ae69a6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools", "setuptools-scm[toml]"]
+requires = ["setuptools", "setuptools_scm[toml]"]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -31,4 +31,4 @@ test = ["pytest", "pytest-order"]
 bitrot = "bitrot:run_from_command_line"
 
 [tool.setuptools_scm]
-tag_regex = "^(?P<version>v\\d+(?:\\.\\d+){0,2}[^\\+]*)(?:\\+.*)?$"
+write_to = '_version.py'
diff --git a/tests/test_bitrot.py b/tests/test_bitrot.py
index 73f0dc4..82a4ec4 100644
--- a/tests/test_bitrot.py
+++ b/tests/test_bitrot.py
@@ -15,13 +15,14 @@
 
 import pytest
 
+from typing import TYPE_CHECKING
 
 TMP = Path("/tmp/")
 
-
-ReturnCode = int
-StdOut = list[str]
-StdErr = list[str]
+if TYPE_CHECKING:
+    ReturnCode = int
+    StdOut = list[str]
+    StdErr = list[str]
 
 
 def bitrot(*args: str) -> tuple[ReturnCode, StdOut, StdErr]: