diff --git a/pyproject.toml b/pyproject.toml
index 3f6055d70..e44176737 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [build-system]
 requires = [
     "setuptools", "wheel",
-    "cython>=0.24,<=0.29.14,!=0.27,!=0.27.2",
+    "cython>=0.24,<=0.29.21,!=0.27,!=0.27.2",
     'kivy_deps.gstreamer_dev~=0.3.1; sys_platform == "win32"',
     'kivy_deps.sdl2_dev~=0.3.1; sys_platform == "win32"',
     'kivy_deps.glew_dev~=0.3.0; sys_platform == "win32"',
diff --git a/setup.cfg b/setup.cfg
index 4eb763664..1bf92ab21 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,7 +7,7 @@ logging-level=DEBUG
 
 [kivy]
 cython_min=0.24
-cython_max=0.29.19
+cython_max=0.29.21
 cython_exclude=0.27,0.27.2
 
 [coverage:run]