diff --git a/test-requirements.txt b/test-requirements.txt
index f5b79c9..6b43377 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,3 +1,3 @@
-Cython==0.29.21
+Cython==0.29.26
 pytest==6.2.5
 pytest-cov==3.0.0