diff --git a/requirements-tests.txt b/requirements-tests.txt
index 421bea5ac52f..e84fccd25e21 100644
--- a/requirements-tests.txt
+++ b/requirements-tests.txt
@@ -5,7 +5,7 @@ flake8-bugbear==22.10.27  # must match .pre-commit-config.yaml
 flake8-noqa==1.2.9        # must match .pre-commit-config.yaml
 flake8-pyi==22.10.0       # must match .pre-commit-config.yaml
 isort==5.10.1             # must match .pre-commit-config.yaml
-mypy==0.982
+mypy==0.990
 packaging==21.3
 pathspec
 pycln==2.1.1              # must match .pre-commit-config.yaml
diff --git a/stdlib/importlib/abc.pyi b/stdlib/importlib/abc.pyi
index 7abe26d97268..c961fb2e1f9e 100644
--- a/stdlib/importlib/abc.pyi
+++ b/stdlib/importlib/abc.pyi
@@ -179,6 +179,7 @@ if sys.version_info >= (3, 9):
             self, mode: str, buffering: int = ..., encoding: str | None = ..., errors: str | None = ..., newline: str | None = ...
         ) -> IO[Any]: ...
         @property
+        @abstractmethod
         def name(self) -> str: ...
         @abstractmethod
         def __truediv__(self, child: str) -> Traversable: ...
diff --git a/test_cases/stdlib/asyncio/check_task.py b/test_cases/stdlib/asyncio/check_task.py
index d674c44abb8b..69bcf8f782aa 100644
--- a/test_cases/stdlib/asyncio/check_task.py
+++ b/test_cases/stdlib/asyncio/check_task.py
@@ -15,7 +15,7 @@ async def join(self) -> None:
 
 
 async def foo() -> int:
-    ...
+    return 42
 
 
 async def main() -> None:
diff --git a/test_cases/stdlib/builtins/check_dict.py b/test_cases/stdlib/builtins/check_dict.py
index b2def8b9a017..3ba6ce89a7a4 100644
--- a/test_cases/stdlib/builtins/check_dict.py
+++ b/test_cases/stdlib/builtins/check_dict.py
@@ -16,11 +16,13 @@
 
 
 class KeysAndGetItem(Generic[_KT, _VT]):
+    data: Dict[_KT, _VT]
+
     def keys(self) -> Iterable[_KT]:
-        ...
+        return self.data.keys()
 
     def __getitem__(self, __k: _KT) -> _VT:
-        ...
+        return self.data[__k]
 
 
 kt1: KeysAndGetItem[int, str] = KeysAndGetItem()
diff --git a/tests/stubtest_allowlists/py3_common.txt b/tests/stubtest_allowlists/py3_common.txt
index 29241c85f051..03db863c07d3 100644
--- a/tests/stubtest_allowlists/py3_common.txt
+++ b/tests/stubtest_allowlists/py3_common.txt
@@ -438,6 +438,17 @@ types.WrapperDescriptorType.__get__
 typing.[A-Z]\w+
 typing_extensions\..*
 
+# These are abstract properties at runtime,
+# but marking them as such in the stub breaks half the the typed-Python ecosystem (see #8726)
+typing.IO.closed
+typing.IO.mode
+typing.IO.name
+typing.TextIO.buffer
+typing.TextIO.encoding
+typing.TextIO.errors
+typing.TextIO.line_buffering
+typing.TextIO.newlines
+
 # Typing-related weirdness
 _collections_abc.Callable
 _typeshed.*  # Utility types for typeshed, doesn't exist at runtime