diff --git a/.gitignore b/.gitignore
index 1966257..eea8f48 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,5 +22,3 @@ PyYAML-3.09.tar.gz
 /6.0b1.tar.gz
 /6.0.tar.gz
 /6.0.1.tar.gz
-/6.0.2.tar.gz
-/6.0.3.tar.gz
diff --git a/731.patch b/731.patch
new file mode 100644
index 0000000..4c924f4
--- /dev/null
+++ b/731.patch
@@ -0,0 +1,39 @@
+From 17dc5b6cd96dcfe64fd71789c771ca9b96d260e5 Mon Sep 17 00:00:00 2001
+From: "Andrew J. Hesford" <ajh@sideband.org>
+Date: Fri, 21 Jul 2023 09:50:00 -0400
+Subject: [PATCH] Fix builds with Cython 3
+
+This is a *de minimis* fix for building with Cython 3. Recent Cython<3
+releases provided `Cython.Distutils.build_ext` as an alias to
+`Cython.Distutils.old_build_ext.old_build_ext`; Cython 3 drops this
+alias and instead uses a wholly new `Cython.Distutils.build_ext` that
+does not provide the `cython_sources` function used in `setup.py`.
+
+Explicitly importing `old_build_ext` preserves the existing behavior for
+recent Cython<3 and uses the correct behavior for Cython 3. Should the
+import fail (*e.g.*, because the version of Cython available predates
+the availability of `old_build_ext`), the import falls back to just
+`Cython.Distutils.build_ext`.
+
+Signed-off-by: Andrew J. Hesford <ajh@sideband.org>
+---
+ setup.py | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/setup.py b/setup.py
+index 944e7fa2..462b1e95 100644
+--- a/setup.py
++++ b/setup.py
+@@ -82,7 +82,11 @@
+     with_cython = True
+ try:
+     from Cython.Distutils.extension import Extension as _Extension
+-    from Cython.Distutils import build_ext as _build_ext
++    try:
++        from Cython.Distutils.old_build_ext import old_build_ext as _build_ext
++    except ImportError:
++        from Cython.Distutils import build_ext as _build_ext
++
+     with_cython = True
+ except ImportError:
+     if with_cython:
diff --git a/PyYAML.spec b/PyYAML.spec
index 8cb2438..ead210f 100644
--- a/PyYAML.spec
+++ b/PyYAML.spec
@@ -1,5 +1,5 @@
 Name:           PyYAML
-Version:        6.0.3
+Version:        6.0.1
 Release:        %autorelease
 Summary:        YAML parser and emitter for Python
 
@@ -8,10 +8,13 @@ License:        MIT
 URL:            https://github.com/yaml/pyyaml
 Source:         https://github.com/yaml/pyyaml/archive/%{version}.tar.gz
 
+# Fix build with Cython 3
+# Proposed upstream but refused (upstream does not want Cython 3)
+Patch:          https://github.com/yaml/pyyaml/pull/731.patch
+
 BuildRequires:  gcc
 BuildRequires:  libyaml-devel
 BuildRequires:  python3-devel
-BuildRequires:  python3-pytest
 
 
 %global _description\
@@ -45,6 +48,9 @@ chmod a-x examples/yaml-highlight/yaml_hl.py
 # remove pre-generated file
 rm -rf ext/_yaml.c
 
+# we have a patch for Cython 3
+sed -i 's/Cython<3.0/Cython/' pyproject.toml
+
 
 %generate_buildrequires
 %pyproject_buildrequires
@@ -60,7 +66,7 @@ rm -rf ext/_yaml.c
 
 
 %check
-%pytest
+%{py3_test_envvars} %{python3} tests/lib/test_all.py
 
 
 %files -n python3-pyyaml -f %{pyproject_files}
diff --git a/sources b/sources
index b7b81fd..e041a66 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (6.0.3.tar.gz) = a0da43e32d127409ad61b11dc1d733b2e9c743977b3d72c05c81fc2ab183b40bc284452b0874dbeae1a736e1cd4a34f0df641ceefd5e9df38b3e53155fc5f633
+SHA512 (6.0.1.tar.gz) = 1c74a92a4ad7d47854dc7bcb2e89b3c8e0b14fa815c7dbfbc22b24480dbba6c81e971c77ee384c494a960914b95f06edf943d7431925a5ed674a0ba830d258e0