1 files changed, 2 insertions, 5 deletions
diff --git a/src/hydrilla/proxy/state.py b/src/hydrilla/proxy/state.py
index 4142f7f..5e09367 100644
--- a/src/hydrilla/proxy/state.py
+++ b/src/hydrilla/proxy/state.py
@@ -31,9 +31,6 @@ This module defines API for keeping track of all settings, rules, mappings and
 resources.
 """
 
-# Enable using with Python 3.7.
-from __future__ import annotations
-
 import dataclasses as dc
 import typing as t
 
@@ -79,7 +76,7 @@ class FrozenStatus(Enum):
     NOT_FROZEN    = 'N'
 
     @staticmethod
-    def make(letter: t.Optional[str]) -> t.Optional[FrozenStatus]:
+    def make(letter: t.Optional[str]) -> t.Optional['FrozenStatus']:
         if letter is None:
             return None
 
@@ -419,7 +416,7 @@ class ResourceVersionRef(Ref, item_infos.CorrespondsToResourceDCMixin):
         ...
 
     @abstractmethod
-    def get_dependency(self, identifier: str) -> ResourceVersionRef:
+    def get_dependency(self, identifier: str) -> 'ResourceVersionRef':
         ...
 
     @abstractmethod