diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index f1b1bef..e15cac7 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -14,7 +14,7 @@ repos:
     -   id: check-toml
 # Python
 -   repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.7.4
+    rev: v0.9.3
     hooks:
     - id: ruff
       args: [ --fix ]
diff --git a/dargs/__init__.py b/dargs/__init__.py
index af2f59b..77ec18d 100644
--- a/dargs/__init__.py
+++ b/dargs/__init__.py
@@ -2,4 +2,4 @@
 
 from .dargs import Argument, ArgumentEncoder, Variant
 
-__all__ = ["Argument", "Variant", "ArgumentEncoder"]
+__all__ = ["Argument", "ArgumentEncoder", "Variant"]
diff --git a/dargs/dargs.py b/dargs/dargs.py
index caf8dc6..3d7734b 100644
--- a/dargs/dargs.py
+++ b/dargs/dargs.py
@@ -460,7 +460,7 @@ def _check_exist(self, argdict: dict, path=None):
             return
         if self.name not in argdict:
             raise ArgumentKeyError(
-                path, f"key `{self.name}` is required " "in arguments but not found"
+                path, f"key `{self.name}` is required in arguments but not found"
             )
 
     def _check_data(self, value: Any, path=None):
@@ -862,8 +862,7 @@ def get_choice(self, argdict: dict, path=None) -> Argument:
         else:
             raise ArgumentKeyError(
                 path,
-                f"key `{self.flag_name}` is required "
-                "to choose variant but not found.",
+                f"key `{self.flag_name}` is required to choose variant but not found.",
             )
 
     def flatten_sub(self, argdict: dict, path=None) -> dict[str, Argument]: