diff --git a/tests/requirements.txt b/tests/requirements.txt
index e0adb3f..2d1f777 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,7 +1,7 @@
 attrs==19.1.0
 black==19.3b0
 coverage==4.5.3
-Cython==0.29.11;sys_platform!='win32'
+Cython==0.29.12;sys_platform!='win32'
 flake8==3.7.8
 flake8-quotes==2.0.1
 isort==4.3.21