diff --git a/httpcore/_async/connection_pool.py b/httpcore/_async/connection_pool.py
index b466dc71..55416891 100644
--- a/httpcore/_async/connection_pool.py
+++ b/httpcore/_async/connection_pool.py
@@ -349,6 +349,6 @@ async def __aiter__(self) -> AsyncIterator[bytes]:
     async def aclose(self) -> None:
         try:
             if hasattr(self._stream, "aclose"):
-                await self._stream.aclose()  # type: ignore
+                await self._stream.aclose()
         finally:
             await self._pool.response_closed(self._status)
diff --git a/httpcore/_models.py b/httpcore/_models.py
index bc557606..e15305ee 100644
--- a/httpcore/_models.py
+++ b/httpcore/_models.py
@@ -441,7 +441,7 @@ def close(self) -> None:
                 "You should use 'await response.aclose()' instead."
             )
         if hasattr(self.stream, "close"):
-            self.stream.close()  # type: ignore
+            self.stream.close()
 
     # Async interface...
 
@@ -480,4 +480,4 @@ async def aclose(self) -> None:
                 "You should use 'response.close()' instead."
             )
         if hasattr(self.stream, "aclose"):
-            await self.stream.aclose()  # type: ignore
+            await self.stream.aclose()
diff --git a/httpcore/_sync/connection_pool.py b/httpcore/_sync/connection_pool.py
index 65dfd33c..020893d3 100644
--- a/httpcore/_sync/connection_pool.py
+++ b/httpcore/_sync/connection_pool.py
@@ -349,6 +349,6 @@ def __iter__(self) -> Iterator[bytes]:
     def close(self) -> None:
         try:
             if hasattr(self._stream, "close"):
-                self._stream.close()  # type: ignore
+                self._stream.close()
         finally:
             self._pool.response_closed(self._status)
diff --git a/requirements.txt b/requirements.txt
index 79bc3781..9b2f344f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ coverage==6.5.0
 flake8==3.9.2  # See: https://github.com/PyCQA/flake8/pull/1438
 isort==5.10.1
 importlib-metadata==4.13.0
-mypy==0.981
+mypy==0.991
 trio-typing==0.7.0
 types-certifi==2021.10.8.3
 pytest==7.2.0