diff --git a/git/cmd.py b/git/cmd.py
index c7cec48d7..731d0fab8 100644
--- a/git/cmd.py
+++ b/git/cmd.py
@@ -749,7 +749,7 @@ class CatFileContentStream:
         rest to ensure the underlying stream continues to work.
         """
 
-        __slots__: Tuple[str, ...] = ("_stream", "_nbr", "_size")
+        __slots__ = ("_stream", "_nbr", "_size")
 
         def __init__(self, size: int, stream: IO[bytes]) -> None:
             self._stream = stream
@@ -846,14 +846,14 @@ def __del__(self) -> None:
                 self._stream.read(bytes_left + 1)
             # END handle incomplete read
 
-    def __init__(self, working_dir: Union[None, PathLike] = None):
+    def __init__(self, working_dir: Union[None, PathLike] = None) -> None:
         """Initialize this instance with:
 
         :param working_dir:
-           Git directory we should work in. If ``None``, we always work in the current
-           directory as returned by :func:`os.getcwd`.
-           This is meant to be the working tree directory if available, or the
-           ``.git`` directory in case of bare repositories.
+            Git directory we should work in. If ``None``, we always work in the current
+            directory as returned by :func:`os.getcwd`.
+            This is meant to be the working tree directory if available, or the
+            ``.git`` directory in case of bare repositories.
         """
         super().__init__()
         self._working_dir = expand_path(working_dir)
@@ -1103,8 +1103,8 @@ def execute(
         :raise git.exc.GitCommandError:
 
         :note:
-           If you add additional keyword arguments to the signature of this method,
-           you must update the ``execute_kwargs`` variable housed in this module.
+            If you add additional keyword arguments to the signature of this method, you
+            must update the ``execute_kwargs`` variable housed in this module.
         """
         # Remove password for the command if present.
         redacted_command = remove_password_if_present(command)
@@ -1438,7 +1438,7 @@ def _call_process(
 
         turns into::
 
-           git rev-list max-count 10 --header master
+            git rev-list max-count 10 --header master
 
         :return:
             Same as :meth:`execute`. If no args are given, used :meth:`execute`'s
diff --git a/git/objects/base.py b/git/objects/base.py
index e78420e8a..2b8dd0ff6 100644
--- a/git/objects/base.py
+++ b/git/objects/base.py
@@ -55,7 +55,7 @@ class Object(LazyMixin):
 
     type: Union[Lit_commit_ish, None] = None
 
-    def __init__(self, repo: "Repo", binsha: bytes):
+    def __init__(self, repo: "Repo", binsha: bytes) -> None:
         """Initialize an object by identifying it by its binary sha.
 
         All keyword arguments will be set on demand if ``None``.
diff --git a/git/objects/submodule/root.py b/git/objects/submodule/root.py
index ac0f7ad94..3268d73a4 100644
--- a/git/objects/submodule/root.py
+++ b/git/objects/submodule/root.py
@@ -56,7 +56,7 @@ class RootModule(Submodule):
 
     k_root_name = "__ROOT__"
 
-    def __init__(self, repo: "Repo"):
+    def __init__(self, repo: "Repo") -> None:
         # repo, binsha, mode=None, path=None, name = None, parent_commit=None, url=None, ref=None)
         super().__init__(
             repo,
diff --git a/git/refs/head.py b/git/refs/head.py
index d546cb4ef..f6020f461 100644
--- a/git/refs/head.py
+++ b/git/refs/head.py
@@ -44,7 +44,7 @@ class HEAD(SymbolicReference):
 
     __slots__ = ()
 
-    def __init__(self, repo: "Repo", path: PathLike = _HEAD_NAME):
+    def __init__(self, repo: "Repo", path: PathLike = _HEAD_NAME) -> None:
         if path != self._HEAD_NAME:
             raise ValueError("HEAD instance must point to %r, got %r" % (self._HEAD_NAME, path))
         super().__init__(repo, path)
diff --git a/git/refs/log.py b/git/refs/log.py
index 7aefeb4e6..f98f56f11 100644
--- a/git/refs/log.py
+++ b/git/refs/log.py
@@ -164,7 +164,7 @@ def __new__(cls, filepath: Union[PathLike, None] = None) -> "RefLog":
         inst = super().__new__(cls)
         return inst
 
-    def __init__(self, filepath: Union[PathLike, None] = None):
+    def __init__(self, filepath: Union[PathLike, None] = None) -> None:
         """Initialize this instance with an optional filepath, from which we will
         initialize our data. The path is also used to write changes back using the
         :meth:`write` method."""
diff --git a/git/refs/symbolic.py b/git/refs/symbolic.py
index 142952e06..16aada0a7 100644
--- a/git/refs/symbolic.py
+++ b/git/refs/symbolic.py
@@ -74,7 +74,7 @@ class SymbolicReference:
     _remote_common_path_default = "refs/remotes"
     _id_attribute_ = "name"
 
-    def __init__(self, repo: "Repo", path: PathLike, check_path: bool = False):
+    def __init__(self, repo: "Repo", path: PathLike, check_path: bool = False) -> None:
         self.repo = repo
         self.path = path
 
diff --git a/git/util.py b/git/util.py
index 52f9dbdad..d272dc53c 100644
--- a/git/util.py
+++ b/git/util.py
@@ -917,7 +917,7 @@ class Stats:
 
     __slots__ = ("total", "files")
 
-    def __init__(self, total: Total_TD, files: Dict[PathLike, Files_TD]):
+    def __init__(self, total: Total_TD, files: Dict[PathLike, Files_TD]) -> None:
         self.total = total
         self.files = files