diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 8eb3722..b4c460b 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -39,7 +39,7 @@ jobs:
           echo "::set-output name=dir::$(pip cache dir)"
 
       - name: pip cache
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ${{ steps.pip-cache.outputs.dir }}
           key: ${{ runner.os }}-py${{ matrix.python-version }}-pip-${{ hashFiles('**/requirements.txt') }}
diff --git a/magic_filter/magic.py b/magic_filter/magic.py
index 77266e7..a46ae21 100644
--- a/magic_filter/magic.py
+++ b/magic_filter/magic.py
@@ -280,7 +280,7 @@ def regexp(
         regexp_func = getattr(pattern, mode)
         return self._extend(FunctionOperation(regexp_func))
 
-    def func(self: MagicT, func: Callable[[Any], Any], *args: Any, **kwargs: Any) -> MagicT:
+    def func(self: MagicT, func: Callable[..., Any], *args: Any, **kwargs: Any) -> MagicT:
         return self._extend(FunctionOperation(func, *args, **kwargs))
 
     def cast(self: MagicT, func: Callable[[Any], Any]) -> MagicT:
diff --git a/magic_filter/operations/base.py b/magic_filter/operations/base.py
index 2745990..84ee249 100644
--- a/magic_filter/operations/base.py
+++ b/magic_filter/operations/base.py
@@ -3,6 +3,8 @@
 
 
 class BaseOperation(ABC):
+    __slots__ = ()
+
     important: bool = False
 
     @abstractmethod