diff --git a/construct_typed/tenum.py b/construct_typed/tenum.py
index 300654c..d9454c8 100644
--- a/construct_typed/tenum.py
+++ b/construct_typed/tenum.py
@@ -48,13 +48,13 @@ class TEnum(Adapter[int, int, EnumType, EnumType]):
             )
 
         # save enum type
-        self.enum_type = enum_type
+        self.enum_type = t.cast(t.Type[EnumType], enum_type) # type: ignore
 
         # init adatper
         super(TEnum, self).__init__(subcon)
 
     def _decode(self, obj: int, context: Context, path: PathType) -> EnumType:
-        return self.enum_type(obj)  # type: ignore
+        return self.enum_type(obj)
 
     def _encode(
         self,
@@ -86,13 +86,13 @@ class TFlagsEnum(Adapter[int, int, FlagsEnumType, FlagsEnumType]):
             )
 
         # save enum type
-        self.enum_type = enum_type
+        self.enum_type = t.cast(t.Type[FlagsEnumType], enum_type) # type: ignore
 
         # init adatper
         super(TFlagsEnum, self).__init__(subcon)
 
     def _decode(self, obj: int, context: Context, path: PathType) -> FlagsEnumType:
-        return self.enum_type(obj)  # type: ignore
+        return self.enum_type(obj)
 
     def _encode(
         self,
diff --git a/requirements.txt b/requirements.txt
index 1048144..e7dc9eb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,4 +2,5 @@ construct==2.10.*
 pytest>=6.2.0
 numpy==1.19.3
 arrow
-ruamel.yaml
\ No newline at end of file
+ruamel.yaml
+mypy
\ No newline at end of file
diff --git a/tests/test_typed.py b/tests/test_typed.py
index 770b418..783015e 100644
--- a/tests/test_typed.py
+++ b/tests/test_typed.py
@@ -11,7 +11,7 @@ import pytest
 from .declarativeunittest import common, raises, setattrs
 
 
-def test_tcontainer_compare_with_dataclass():
+def test_tcontainer_compare_with_dataclass() -> None:
     @dataclasses.dataclass
     class TestContainer:
         a: t.Optional[int] = cst.TStructField(cs.Const(1, cs.Byte))