diff -up rdflib-7.0.0/test/test_misc/test_parse_file_guess_format.py.pytest8 rdflib-7.0.0/test/test_misc/test_parse_file_guess_format.py
--- rdflib-7.0.0/test/test_misc/test_parse_file_guess_format.py.pytest8	2023-06-01 21:15:21.520171900 +0200
+++ rdflib-7.0.0/test/test_misc/test_parse_file_guess_format.py	2024-07-02 17:45:47.257339626 +0200
@@ -61,7 +61,7 @@ class TestFileParserGuessFormat:
             g.parse(os.path.join(TEST_DATA_DIR, "example-lots_of_graphs.n3")), Graph
         )
 
-    def test_warning(self) -> None:
+    def test_warning(self, caplog: pytest.LogCaptureFixture) -> None:
         g = Graph()
         graph_logger = logging.getLogger("rdflib")
 
@@ -78,9 +78,16 @@ class TestFileParserGuessFormat:
                 ),
                 str(newpath),
             )
-            with pytest.raises(ParserError, match=r"Could not guess RDF format"):
-                with pytest.warns(
-                    UserWarning,
-                    match="does not look like a valid URI, trying to serialize this will break.",
-                ) as logwarning:
-                    g.parse(str(newpath))
+            with pytest.raises(
+                ParserError, match=r"Could not guess RDF format"
+            ), caplog.at_level("WARNING"):
+                g.parse(str(newpath))
+
+            assert any(
+                rec.levelno == logging.WARNING
+                and (
+                    "does not look like a valid URI, trying to serialize this will break."
+                    in rec.message
+                )
+                for rec in caplog.records
+            )