diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 7cee0cd64..4c918a92d 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -88,7 +88,7 @@ jobs:
 
     - name: Check types with mypy
       run: |
-        mypy --python-version=${{ matrix.python-version }} -p git
+        mypy --python-version=${{ matrix.python-version }}
       env:
         MYPY_FORCE_COLOR: "1"
         TERM: "xterm-256color"  # For color: https://github.com/python/mypy/issues/13817
diff --git a/README.md b/README.md
index 30af532db..9bedaaae7 100644
--- a/README.md
+++ b/README.md
@@ -167,7 +167,7 @@ This includes the linting and autoformatting done by Ruff, as well as some other
 To typecheck, run:
 
 ```sh
-mypy -p git
+mypy
 ```
 
 #### CI (and tox)
diff --git a/pyproject.toml b/pyproject.toml
index 1dc1e6aed..5eac2be09 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,6 +21,7 @@ testpaths = "test"  # Space separated list of paths from root e.g test tests doc
 
 [tool.mypy]
 python_version = "3.8"
+files = ["git/", "test/deprecation/"]
 disallow_untyped_defs = true
 no_implicit_optional = true
 warn_redundant_casts = true
diff --git a/test/deprecation/test_basic.py b/test/deprecation/test_basic.py
index 459d79268..8ee7e72b1 100644
--- a/test/deprecation/test_basic.py
+++ b/test/deprecation/test_basic.py
@@ -25,9 +25,21 @@
 from git.repo import Repo
 from git.util import Iterable as _Iterable, IterableObj
 
+# typing -----------------------------------------------------------------
+
+from typing import Generator, TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from pathlib import Path
+
+    from git.diff import Diff
+    from git.objects.commit import Commit
+
+# ------------------------------------------------------------------------
+
 
 @contextlib.contextmanager
-def _assert_no_deprecation_warning():
+def _assert_no_deprecation_warning() -> Generator[None, None, None]:
     """Context manager to assert that code does not issue any deprecation warnings."""
     with warnings.catch_warnings():
         # FIXME: Refine this to filter for deprecation warnings from GitPython.
@@ -36,7 +48,7 @@ def _assert_no_deprecation_warning():
 
 
 @pytest.fixture
-def commit(tmp_path):
+def commit(tmp_path: "Path") -> Generator["Commit", None, None]:
     """Fixture to supply a one-commit repo's commit, enough for deprecation tests."""
     (tmp_path / "a.txt").write_text("hello\n", encoding="utf-8")
     repo = Repo.init(tmp_path)
@@ -46,67 +58,67 @@ def commit(tmp_path):
 
 
 @pytest.fixture
-def diff(commit):
+def diff(commit: "Commit") -> Generator["Diff", None, None]:
     """Fixture to supply a single-file diff."""
     (diff,) = commit.diff(NULL_TREE)  # Exactly one file in the diff.
     yield diff
 
 
-def test_diff_renamed_warns(diff):
+def test_diff_renamed_warns(diff: "Diff") -> None:
     """The deprecated Diff.renamed property issues a deprecation warning."""
     with pytest.deprecated_call():
         diff.renamed
 
 
-def test_diff_renamed_file_does_not_warn(diff):
+def test_diff_renamed_file_does_not_warn(diff: "Diff") -> None:
     """The preferred Diff.renamed_file property issues no deprecation warning."""
     with _assert_no_deprecation_warning():
         diff.renamed_file
 
 
-def test_commit_trailers_warns(commit):
+def test_commit_trailers_warns(commit: "Commit") -> None:
     """The deprecated Commit.trailers property issues a deprecation warning."""
     with pytest.deprecated_call():
         commit.trailers
 
 
-def test_commit_trailers_list_does_not_warn(commit):
+def test_commit_trailers_list_does_not_warn(commit: "Commit") -> None:
     """The nondeprecated Commit.trailers_list property issues no deprecation warning."""
     with _assert_no_deprecation_warning():
         commit.trailers_list
 
 
-def test_commit_trailers_dict_does_not_warn(commit):
+def test_commit_trailers_dict_does_not_warn(commit: "Commit") -> None:
     """The nondeprecated Commit.trailers_dict property issues no deprecation warning."""
     with _assert_no_deprecation_warning():
         commit.trailers_dict
 
 
-def test_traverse_list_traverse_in_base_class_warns(commit):
+def test_traverse_list_traverse_in_base_class_warns(commit: "Commit") -> None:
     """Traversable.list_traverse's base implementation issues a deprecation warning."""
     with pytest.deprecated_call():
         Traversable.list_traverse(commit)
 
 
-def test_traversable_list_traverse_override_does_not_warn(commit):
+def test_traversable_list_traverse_override_does_not_warn(commit: "Commit") -> None:
     """Calling list_traverse on concrete subclasses is not deprecated, does not warn."""
     with _assert_no_deprecation_warning():
         commit.list_traverse()
 
 
-def test_traverse_traverse_in_base_class_warns(commit):
+def test_traverse_traverse_in_base_class_warns(commit: "Commit") -> None:
     """Traversable.traverse's base implementation issues a deprecation warning."""
     with pytest.deprecated_call():
         Traversable.traverse(commit)
 
 
-def test_traverse_traverse_override_does_not_warn(commit):
+def test_traverse_traverse_override_does_not_warn(commit: "Commit") -> None:
     """Calling traverse on concrete subclasses is not deprecated, does not warn."""
     with _assert_no_deprecation_warning():
         commit.traverse()
 
 
-def test_iterable_inheriting_warns():
+def test_iterable_inheriting_warns() -> None:
     """Subclassing the deprecated git.util.Iterable issues a deprecation warning."""
     with pytest.deprecated_call():
 
@@ -114,7 +126,7 @@ class Derived(_Iterable):
             pass
 
 
-def test_iterable_obj_inheriting_does_not_warn():
+def test_iterable_obj_inheriting_does_not_warn() -> None:
     """Subclassing git.util.IterableObj is not deprecated, does not warn."""
     with _assert_no_deprecation_warning():
 
diff --git a/tox.ini b/tox.ini
index 33074a78a..fc62fa587 100644
--- a/tox.ini
+++ b/tox.ini
@@ -30,7 +30,7 @@ description = Typecheck with mypy
 base_python = py{39,310,311,312,38,37}
 set_env =
     MYPY_FORCE_COLOR = 1
-commands = mypy -p git
+commands = mypy
 ignore_outcome = true
 
 [testenv:html]