diff --git a/requirements-dev.txt b/requirements-dev.txt
index 2c9c38e0..201a4de2 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,4 +1,4 @@
-cython==0.29.21
+cython==0.29.22
 tox
 coverage
 flake8