diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index e3f371e..160828a 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -24,7 +24,7 @@ repos:
     hooks:
       - id: pyupgrade
   - repo: https://github.com/psf/black-pre-commit-mirror
-    rev: 23.12.1
+    rev: 24.1.0
     hooks:
       - id: black
   - repo: https://github.com/asottile/blacken-docs
diff --git a/tests/test_rpc.py b/tests/test_rpc.py
index c17624b..3a64acf 100644
--- a/tests/test_rpc.py
+++ b/tests/test_rpc.py
@@ -69,11 +69,9 @@ def test_register() -> None:
     server = Server('', MagicMock())
 
     @server.register('hello')
-    def world() -> None:
-        ...
+    def world() -> None: ...
 
     @server.register
-    def help() -> None:
-        ...
+    def help() -> None: ...
 
     assert set(server._methods) == {'hello', 'help'}