diff --git a/doc/requirements.txt b/doc/requirements.txt
@@ -1,8 +1,9 @@
-sphinx == 4.3.2
sphinx_rtd_theme
-sphinxcontrib-applehelp >= 1.0.2, <= 1.0.4
-sphinxcontrib-devhelp == 1.0.2
-sphinxcontrib-htmlhelp >= 2.0.0, <= 2.0.1
-sphinxcontrib-qthelp == 1.0.3
-sphinxcontrib-serializinghtml == 1.1.5
sphinx-autodoc-typehints
diff --git a/git/index/base.py b/git/index/base.py
@@ -28,6 +28,7 @@
from git.objects import Blob, Commit, Object, Submodule, Tree
from git.objects.util import Serializable
from git.util import (
    LazyMixin,
    LockedFD,
    join_path_native,
@@ -76,7 +77,6 @@

    from git.refs.reference import Reference
    from git.repo import Repo
-    from git.util import Actor


Treeish = Union[Tree, Commit, str, bytes]
@@ -1117,8 +1117,8 @@ def commit(
        message: str,
        parent_commits: Union[List[Commit], None] = None,
        head: bool = True,
-        author: Union[None, "Actor"] = None,
-        committer: Union[None, "Actor"] = None,
        author_date: Union[datetime.datetime, str, None] = None,
        commit_date: Union[datetime.datetime, str, None] = None,
        skip_hooks: bool = False,

diff --git a/git/objects/tag.py b/git/objects/tag.py
@@ -14,7 +14,7 @@
import sys

from git.compat import defenc
-from git.util import hex_to_bin

from . import base
from .util import get_object_type_by_name, parse_actor_and_date
@@ -30,7 +30,6 @@

if TYPE_CHECKING:
    from git.repo import Repo
-    from git.util import Actor

    from .blob import Blob
    from .commit import Commit
@@ -64,7 +63,7 @@ def __init__(
        binsha: bytes,
        object: Union[None, base.Object] = None,
        tag: Union[None, str] = None,
-        tagger: Union[None, "Actor"] = None,
        tagged_date: Union[int, None] = None,
        tagger_tz_offset: Union[int, None] = None,
        message: Union[str, None] = None,