diff --git a/aiohttp/client_reqrep.py b/aiohttp/client_reqrep.py
index 785b8d15de6..678fe453a90 100644
--- a/aiohttp/client_reqrep.py
+++ b/aiohttp/client_reqrep.py
@@ -662,9 +662,8 @@ async def send(self, conn: "Connection") -> "ClientResponse":
             self.headers[hdrs.CONNECTION] = connection
 
         # status + headers
-        status_line = "{0} {1} HTTP/{v.major}.{v.minor}".format(
-            self.method, path, v=self.version
-        )
+        v = self.version
+        status_line = f"{self.method} {path} HTTP/{v.major}.{v.minor}"
         await writer.write_headers(status_line, self.headers)
         coro = self.write_bytes(writer, conn)
 
diff --git a/aiohttp/web_response.py b/aiohttp/web_response.py
index 47d75675df0..65c5d7b09f7 100644
--- a/aiohttp/web_response.py
+++ b/aiohttp/web_response.py
@@ -423,9 +423,7 @@ async def _write_headers(self) -> None:
         assert writer is not None
         # status line
         version = request.version
-        status_line = "HTTP/{}.{} {} {}".format(
-            version[0], version[1], self._status, self._reason
-        )
+        status_line = f"HTTP/{version[0]}.{version[1]} {self._status} {self._reason}"
         await writer.write_headers(status_line, self._headers)
 
     async def write(self, data: bytes) -> None: