diff --git a/scrapy/http/request/__init__.py b/scrapy/http/request/__init__.py
index 8f00c20b7..7672dec00 100644
--- a/scrapy/http/request/__init__.py
+++ b/scrapy/http/request/__init__.py
@@ -126,10 +126,10 @@ class Request(object_ref):
 
     __repr__ = __str__
 
-    def copy(self) -> RequestTypeVar:
+    def copy(self) -> "Request":
         return self.replace()
 
-    def replace(self, *args, **kwargs) -> RequestTypeVar:
+    def replace(self, *args, **kwargs) -> "Request":
         """Create a new Request with the same attributes except for those given new values"""
         for x in self.attributes:
             kwargs.setdefault(x, getattr(self, x))
diff --git a/scrapy/http/request/json_request.py b/scrapy/http/request/json_request.py
index dba3c3a82..728a2a104 100644
--- a/scrapy/http/request/json_request.py
+++ b/scrapy/http/request/json_request.py
@@ -10,7 +10,7 @@ import json
 import warnings
 from typing import Optional, Tuple
 
-from scrapy.http.request import Request, RequestTypeVar
+from scrapy.http.request import Request
 from scrapy.utils.deprecate import create_deprecated_class
 
 
@@ -42,7 +42,7 @@ class JsonRequest(Request):
     def dumps_kwargs(self) -> dict:
         return self._dumps_kwargs
 
-    def replace(self, *args, **kwargs) -> RequestTypeVar:
+    def replace(self, *args, **kwargs) -> Request:
         body_passed = kwargs.get('body', None) is not None
         data = kwargs.pop('data', None)
         data_passed = data is not None