diff --git a/docs/users/changelog.md b/docs/users/changelog.md
index 9e4c78a..4d23390 100644
--- a/docs/users/changelog.md
+++ b/docs/users/changelog.md
@@ -5,6 +5,8 @@ Note that there is currently no guarantee for a stable Markdown formatting style
 
 ## **unreleased**
 
+- Removed
+  - `mdformat.codepoints.ASCII_WHITESPACE` (deprecated since 0.7.20)
 - Fixed
   - Read UTF-8 from standard input on all systems.
     Thank you, [Christopher Prohm](https://github.com/chmp), for the PR.
diff --git a/src/mdformat/codepoints/__init__.py b/src/mdformat/codepoints/__init__.py
index 0491ae6..023e674 100644
--- a/src/mdformat/codepoints/__init__.py
+++ b/src/mdformat/codepoints/__init__.py
@@ -2,7 +2,6 @@
     "UNICODE_PUNCTUATION",
     "UNICODE_WHITESPACE",
     "ASCII_CTRL",
-    "ASCII_WHITESPACE",
 )
 
 
@@ -10,23 +9,3 @@
 from mdformat.codepoints._unicode_whitespace import UNICODE_WHITESPACE
 
 ASCII_CTRL = frozenset(chr(i) for i in range(32)) | frozenset(chr(127))
-
-
-def __getattr__(name: str) -> frozenset[str]:
-    """Attribute getter fallback.
-
-    Used during the deprecation period of `ASCII_WHITESPACE`.
-    """
-    if name == "ASCII_WHITESPACE":
-        import warnings
-
-        warnings.warn(
-            "ASCII_WHITESPACE is deprecated because CommonMark v0.30 no longer "
-            "defines ASCII whitespace.",
-            DeprecationWarning,
-            stacklevel=2,
-        )
-        return frozenset({chr(9), chr(10), chr(11), chr(12), chr(13), chr(32)})
-    raise AttributeError(
-        f"module {__name__!r} has no attribute {name!r}"
-    )  # pragma: no cover
diff --git a/tests/test_api.py b/tests/test_api.py
index a7c58e0..73177d7 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -143,11 +143,6 @@ def test_mdrenderer_no_finalize(tmp_path):
     assert finalized == unfinalized + "\n\n[gl ref]: https://gitlab.com\n"
 
 
-def test_ascii_whitespace_deprecation():
-    with pytest.warns(DeprecationWarning):
-        mdformat.codepoints.ASCII_WHITESPACE
-
-
 def test_import_typing():
     """Try to import mdformat.renderer.typing.