diff --git a/python-lxml.spec b/python-lxml.spec
index fb91a3a..a2ce417 100644
--- a/python-lxml.spec
+++ b/python-lxml.spec
@@ -68,6 +68,8 @@ Python 3 version.
 %autosetup -n lxml-%{version} -p1
 # Don't run html5lib tests --without extras
 %{!?without_extras:rm src/lxml/html/tests/test_html5parser.py}
+# lxml 4.9 is not yet ready for Cython 3
+sed -Ei 's/Cython>=([^,]+)/Cython>=\1,<3/' requirements.txt
 
 %generate_buildrequires
 %pyproject_buildrequires -x source%{?with_extras:,cssselect,html5,htmlsoup}