diff --git a/CHANGES/8146.feature.rst b/CHANGES/8146.feature.rst
new file mode 100644
index 00000000000..9b0cc54206e
--- /dev/null
+++ b/CHANGES/8146.feature.rst
@@ -0,0 +1 @@
+Upgraded *llhttp* to 9.2 -- by :user:`Dreamsorcerer`.
diff --git a/tests/test_http_parser.py b/tests/test_http_parser.py
index 3c47231e389..d306267c8bb 100644
--- a/tests/test_http_parser.py
+++ b/tests/test_http_parser.py
@@ -623,25 +623,9 @@ def test_headers_content_length_err_2(parser) -> None:
 }
 
 
-@pytest.fixture
-def xfail_c_parser_empty_header(request) -> None:
-    if not all(
-        (request.getfixturevalue(name) == b"") for name in ("pad1", "pad2", "hdr")
-    ):
-        return
-    if isinstance(request.getfixturevalue("parser"), HttpRequestParserPy):
-        return
-    request.node.add_marker(
-        pytest.mark.xfail(
-            reason="Regression test for Py parser. May match C behaviour later.",
-        )
-    )
-
-
 @pytest.mark.parametrize("hdr", [b"", b"foo"], ids=["name-empty", "with-name"])
 @pytest.mark.parametrize("pad2", _pad.keys(), ids=["post-" + n for n in _pad.values()])
 @pytest.mark.parametrize("pad1", _pad.keys(), ids=["pre-" + n for n in _pad.values()])
-@pytest.mark.usefixtures("xfail_c_parser_empty_header")
 def test_invalid_header_spacing(parser, pad1: bytes, pad2: bytes, hdr: bytes) -> None:
     text = b"GET /test HTTP/1.1\r\n" b"%s%s%s: value\r\n\r\n" % (pad1, hdr, pad2)
     expectation = pytest.raises(http_exceptions.BadHttpMessage)
@@ -653,8 +637,6 @@ def test_invalid_header_spacing(parser, pad1: bytes, pad2: bytes, hdr: bytes) ->
 
 
 def test_empty_header_name(parser) -> None:
-    if not isinstance(parser, HttpRequestParserPy):
-        pytest.xfail("Regression test for Py parser. May match C behaviour later.")
     text = b"GET /test HTTP/1.1\r\n" b":test\r\n\r\n"
     with pytest.raises(http_exceptions.BadHttpMessage):
         parser.feed_data(text)
diff --git a/vendor/llhttp b/vendor/llhttp
index 9ab2afc85b2..533845688d1 160000
--- a/vendor/llhttp
+++ b/vendor/llhttp
@@ -1 +1 @@
-Subproject commit 9ab2afc85b2880d96a94d38afaee301c6a314049
+Subproject commit 533845688d173561b9cba33269130401add38567