diff --git a/vdirsyncer/cli/utils.py b/vdirsyncer/cli/utils.py
index 9cf487f..3a1bc98 100644
--- a/vdirsyncer/cli/utils.py
+++ b/vdirsyncer/cli/utils.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import contextlib
 import errno
 import importlib
@@ -12,6 +14,7 @@ from atomicwrites import atomic_write
 from .. import BUGTRACKER_HOME
 from .. import DOCS_HOME
 from .. import exceptions
+from ..storage.base import Storage
 from ..sync.exceptions import IdentConflict
 from ..sync.exceptions import PartialSync
 from ..sync.exceptions import StorageEmpty
@@ -27,7 +30,7 @@ STATUS_DIR_PERMISSIONS = 0o700
 
 class _StorageIndex:
     def __init__(self):
-        self._storages = {
+        self._storages: dict[str, str] = {
             "caldav": "vdirsyncer.storage.dav.CalDAVStorage",
             "carddav": "vdirsyncer.storage.dav.CardDAVStorage",
             "filesystem": "vdirsyncer.storage.filesystem.FilesystemStorage",
@@ -37,7 +40,7 @@ class _StorageIndex:
             "google_contacts": "vdirsyncer.storage.google.GoogleContactsStorage",
         }
 
-    def __getitem__(self, name):
+    def __getitem__(self, name: str) -> Storage:
         item = self._storages[name]
         if not isinstance(item, str):
             return item
@@ -154,13 +157,18 @@ def handle_cli_error(status_name=None, e=None):
         cli_logger.debug("".join(tb))
 
 
-def get_status_name(pair, collection):
+def get_status_name(pair: str, collection: str | None) -> str:
     if collection is None:
         return pair
     return pair + "/" + collection
 
 
-def get_status_path(base_path, pair, collection=None, data_type=None):
+def get_status_path(
+    base_path: str,
+    pair: str,
+    collection: str | None = None,
+    data_type: str | None = None,
+) -> str:
     assert data_type is not None
     status_name = get_status_name(pair, collection)
     path = expand_path(os.path.join(base_path, status_name))
@@ -174,7 +182,12 @@ def get_status_path(base_path, pair, collection=None, data_type=None):
     return path
 
 
-def load_status(base_path, pair, collection=None, data_type=None):
+def load_status(
+    base_path: str,
+    pair: str,
+    collection: str | None = None,
+    data_type: str | None = None
+) -> dict | None:
     path = get_status_path(base_path, pair, collection, data_type)
     if not os.path.exists(path):
         return None
@@ -189,7 +202,7 @@ def load_status(base_path, pair, collection=None, data_type=None):
     return {}
 
 
-def prepare_status_path(path):
+def prepare_status_path(path: str) -> None:
     dirname = os.path.dirname(path)
 
     try:
@@ -200,7 +213,7 @@ def prepare_status_path(path):
 
 
 @contextlib.contextmanager
-def manage_sync_status(base_path, pair_name, collection_name):
+def manage_sync_status(base_path: str, pair_name: str, collection_name: str):
     path = get_status_path(base_path, pair_name, collection_name, "items")
     status = None
     legacy_status = None
@@ -225,7 +238,13 @@ def manage_sync_status(base_path, pair_name, collection_name):
     yield status
 
 
-def save_status(base_path, pair, collection=None, data_type=None, data=None):
+def save_status(
+    base_path: str,
+    pair: str,
+    collection: str | None = None,
+    data_type: str | None = None,
+    data: dict | None = None,
+) -> None:
     assert data_type is not None
     assert data is not None
     status_name = get_status_name(pair, collection)
@@ -319,7 +338,7 @@ def handle_storage_init_error(cls, config):
     )
 
 
-def assert_permissions(path, wanted):
+def assert_permissions(path: str, wanted: int) -> None:
     permissions = os.stat(path).st_mode & 0o777
     if permissions > wanted:
         cli_logger.warning(