diff --git a/aiogram/dispatcher/fsm/state.py b/aiogram/dispatcher/fsm/state.py
index e6a204f8..6c49d63b 100644
--- a/aiogram/dispatcher/fsm/state.py
+++ b/aiogram/dispatcher/fsm/state.py
@@ -1,5 +1,5 @@
 import inspect
-from typing import Any, Dict, Iterator, Optional, Tuple, Type, no_type_check
+from typing import Any, Iterator, Optional, Tuple, Type, no_type_check
 
 from ...types import TelegramObject
 
@@ -54,18 +54,17 @@ class State:
             return True
         return raw_state == self.state
 
-    def __eq__(self, other):
+    def __eq__(self, other: Any) -> bool:
         if isinstance(other, self.__class__):
             return self.state == other.state
         if isinstance(other, str):
             return self.state == other
         raise ValueError(f"Comparing {type(self)} and {type(other)} is not supported")
 
-    def __hash__(self):
+    def __hash__(self) -> int:
         return hash(self.state)
 
 
-
 class StatesGroupMeta(type):
     __parent__: "Optional[Type[StatesGroup]]"
     __childs__: "Tuple[Type[StatesGroup], ...]"
diff --git a/tests/test_dispatcher/test_filters/test_state.py b/tests/test_dispatcher/test_filters/test_state.py
index f1e7c037..5f74d091 100644
--- a/tests/test_dispatcher/test_filters/test_state.py
+++ b/tests/test_dispatcher/test_filters/test_state.py
@@ -58,3 +58,14 @@ class TestStateFilter:
             state = State()
 
         assert SG.state == copy(SG.state)
+
+        assert SG.state == "SG:state"
+        assert "SG:state" == SG.state
+
+        assert State() == State()
+
+        with pytest.raises(ValueError):
+            assert SG.state == 1
+
+        states = {SG.state: "OK"}
+        assert states.get(copy(SG.state)) == "OK"