diff --git a/intake/source.py b/intake/source.py
index c1e05d2..3bf4d04 100644
--- a/intake/source.py
+++ b/intake/source.py
@@ -3,7 +3,7 @@ from pathlib import Path
 from subprocess import Popen, PIPE, TimeoutExpired
 from threading import Thread
 from time import time as current_time
-from typing import List
+from typing import Generator
 import json
 import os
 import os.path
@@ -168,7 +168,7 @@ class LocalSource:
     def get_item_path(self, item_id: dict) -> Path:
         return self.source_path / f"{item_id}.item"
 
-    def get_item_ids(self) -> List[str]:
+    def get_item_ids(self) -> list[str]:
         return [
             filepath.name[:-5]
             for filepath in self.source_path.iterdir()
@@ -193,7 +193,7 @@ class LocalSource:
     def delete_item(self, item_id) -> None:
         os.remove(self.get_item_path(item_id))
 
-    def get_all_items(self) -> List[Item]:
+    def get_all_items(self) -> Generator[Item, None, None]:
         for filepath in self.source_path.iterdir():
             if filepath.name.endswith(".item"):
                 yield Item(self, json.loads(filepath.read_text(encoding="utf8")))
@@ -228,7 +228,7 @@ def _read_stderr(process: Popen) -> None:
 
 def _execute_source_action(
     source: LocalSource, action: str, input: str, timeout: timedelta
-) -> List[str]:
+) -> list[str]:
     """
     Execute the action from a given source. If stdin is specified, pass it
     along to the process. Returns lines from stdout.
@@ -296,13 +296,13 @@ def _execute_source_action(
     return output
 
 
-def fetch_items(source: LocalSource, timeout: int = 60) -> List[Item]:
+def fetch_items(source: LocalSource, timeout: int = 60) -> list[Item]:
     """
     Execute the feed source and return the current feed items.
     Returns a list of feed items on success.
     Throws SourceUpdateException if the feed source update failed.
     """
-    items: List[Item] = []
+    items: list[Item] = []
 
     output = _execute_source_action(source, "fetch", None, timedelta(timeout))
 
@@ -338,7 +338,7 @@ def execute_action(
         raise SourceUpdateException("invalid json")
 
 
-def update_items(source: LocalSource, fetched_items: List[Item]):
+def update_items(source: LocalSource, fetched_items: list[Item]):
     """
     Update the source with a batch of new items, doing creations, updates, and
     deletions as necessary.
@@ -350,8 +350,8 @@ def update_items(source: LocalSource, fetched_items: List[Item]):
     print(f"Found {len(prior_ids)} prior items", file=sys.stderr)
 
     # Determine which items are new and which are updates.
-    new_items: List[Item] = []
-    upd_items: List[Item] = []
+    new_items: list[Item] = []
+    upd_items: list[Item] = []
     for item in fetched_items:
         if source.item_exists(item["id"]):
             upd_items.append(item)