diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 51b6a79..eace0fa 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -85,16 +85,26 @@ jobs:
         python -m pytest tests
         python -m coverage xml
     - name: Upload coverage
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         file: ./coverage.xml
         flags: unit
         fail_ci_if_error: false
 
+  test-summary:
+    if: always()
+    needs: [lint, test]
+    runs-on: ubuntu-latest
+    steps:
+    - name: Test matrix status
+      uses: re-actors/alls-green@release/v1
+      with:
+        jobs: ${{ toJSON(needs) }}
+
   deploy:
     name: Deploy
     runs-on: ubuntu-latest
-    needs: test
+    needs: test-summary
     # Run only on pushing a tag
     if: github.event_name == 'push' && contains(github.ref, 'refs/tags/')
     steps:
diff --git a/CHANGES/421.removal.rst b/CHANGES/421.removal.rst
new file mode 100644
index 0000000..845b6f6
--- /dev/null
+++ b/CHANGES/421.removal.rst
@@ -0,0 +1 @@
+Drop deprecated sync context manager support, use ``async with timeout(...): ...`` instead.
diff --git a/async_timeout/__init__.py b/async_timeout/__init__.py
index 4649d24..a1754b7 100644
--- a/async_timeout/__init__.py
+++ b/async_timeout/__init__.py
@@ -1,12 +1,8 @@
 import asyncio
 import enum
 import sys
-import warnings
 from types import TracebackType
-from typing import Optional, Type
-
-
-from typing import final
+from typing import Optional, Type, final
 
 
 if sys.version_info >= (3, 11):
@@ -107,24 +103,6 @@ def __init__(
         else:
             self.update(deadline)
 
-    def __enter__(self) -> "Timeout":
-        warnings.warn(
-            "with timeout() is deprecated, use async with timeout() instead",
-            DeprecationWarning,
-            stacklevel=2,
-        )
-        self._do_enter()
-        return self
-
-    def __exit__(
-        self,
-        exc_type: Optional[Type[BaseException]],
-        exc_val: Optional[BaseException],
-        exc_tb: Optional[TracebackType],
-    ) -> Optional[bool]:
-        self._do_exit(exc_type)
-        return None
-
     async def __aenter__(self) -> "Timeout":
         self._do_enter()
         return self
diff --git a/tests/test_timeout.py b/tests/test_timeout.py
index 7c687ac..b19c45d 100644
--- a/tests/test_timeout.py
+++ b/tests/test_timeout.py
@@ -360,10 +360,3 @@ async def test_enter_twice() -> None:
     with pytest.raises(RuntimeError, match="invalid state EXIT"):
         async with t:
             await asyncio.sleep(0)
-
-
-@pytest.mark.asyncio
-async def test_deprecated_with() -> None:
-    with pytest.warns(DeprecationWarning):
-        with timeout(1):
-            await asyncio.sleep(0)