diff --git a/peprock/datetime/period.py b/peprock/datetime/period.py
index cacd561..02c2ad3 100644
--- a/peprock/datetime/period.py
+++ b/peprock/datetime/period.py
@@ -38,9 +38,9 @@
 import sys
 
 if sys.version_info >= (3, 11):
-    from typing import Self
+    from typing import Self  # pragma: no cover
 else:
-    from typing_extensions import Self
+    from typing_extensions import Self  # pragma: no cover
 
 
 @dataclasses.dataclass(frozen=True)
diff --git a/pyproject.toml b/pyproject.toml
index 0a037d7..7158339 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,6 @@ changelog_incremental = true
 [tool.coverage.report]
 exclude_also = [
     "@abc\\.abstractmethod$",
-    "@typing\\.overload$",
     "^if typing\\.TYPE_CHECKING:$",
 ]