diff --git a/django-stubs/contrib/admin/checks.pyi b/django-stubs/contrib/admin/checks.pyi
index 8d9ac9e..57f12b4 100644
--- a/django-stubs/contrib/admin/checks.pyi
+++ b/django-stubs/contrib/admin/checks.pyi
@@ -1,14 +1,12 @@
-from typing import Any, List, Union, Optional, Sequence
+from typing import Any, List, Optional, Sequence
 
 from django.contrib.admin.options import BaseModelAdmin
 from django.core.checks.messages import CheckMessage, Error
 
 from django.apps.config import AppConfig
 
-_CheckError = Union[str, Error]
-
-def check_admin_app(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[_CheckError]: ...
-def check_dependencies(**kwargs: Any) -> List[_CheckError]: ...
+def check_admin_app(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[Error]: ...
+def check_dependencies(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[Error]: ...
 
 class BaseModelAdminChecks:
     def check(self, admin_obj: BaseModelAdmin, **kwargs: Any) -> List[CheckMessage]: ...
diff --git a/django-stubs/contrib/auth/checks.pyi b/django-stubs/contrib/auth/checks.pyi
index cac71bd..6006368 100644
--- a/django-stubs/contrib/auth/checks.pyi
+++ b/django-stubs/contrib/auth/checks.pyi
@@ -5,4 +5,4 @@ from django.core.checks.messages import CheckMessage
 from django.apps.config import AppConfig
 
 def check_user_model(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[CheckMessage]: ...
-def check_models_permissions(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[Any]: ...
+def check_models_permissions(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[CheckMessage]: ...
diff --git a/django-stubs/contrib/contenttypes/checks.pyi b/django-stubs/contrib/contenttypes/checks.pyi
index 71701ad..e41f6ac 100644
--- a/django-stubs/contrib/contenttypes/checks.pyi
+++ b/django-stubs/contrib/contenttypes/checks.pyi
@@ -1,6 +1,10 @@
 from typing import Any, List, Optional, Sequence
 
+from django.core.checks.messages import CheckMessage
+
 from django.apps.config import AppConfig
 
-def check_generic_foreign_keys(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[Any]: ...
-def check_model_name_lengths(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[Any]: ...
+def check_generic_foreign_keys(
+    app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any
+) -> List[CheckMessage]: ...
+def check_model_name_lengths(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[CheckMessage]: ...
diff --git a/django-stubs/core/checks/async_checks.pyi b/django-stubs/core/checks/async_checks.pyi
index 09005ff..207442a 100644
--- a/django-stubs/core/checks/async_checks.pyi
+++ b/django-stubs/core/checks/async_checks.pyi
@@ -1,7 +1,9 @@
-from typing import Any, Optional, Sequence
+from typing import Any, List, Optional, Sequence
+
+from django.core.checks.messages import CheckMessage
 
 from django.apps.config import AppConfig
 
 E001: Any
 
-def check_async_unsafe(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any): ...
+def check_async_unsafe(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[CheckMessage]: ...
diff --git a/django-stubs/core/checks/model_checks.pyi b/django-stubs/core/checks/model_checks.pyi
index d73337d..3a4d7dc 100644
--- a/django-stubs/core/checks/model_checks.pyi
+++ b/django-stubs/core/checks/model_checks.pyi
@@ -1,8 +1,8 @@
 from typing import Any, List, Optional, Sequence
 
-from django.core.checks.messages import Warning
+from django.core.checks.messages import CheckMessage, Warning
 
 from django.apps.config import AppConfig
 
-def check_all_models(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[Warning]: ...
-def check_lazy_references(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[Any]: ...
+def check_all_models(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[CheckMessage]: ...
+def check_lazy_references(app_configs: Optional[Sequence[AppConfig]] = ..., **kwargs: Any) -> List[CheckMessage]: ...