diff --git a/requirements/dev.txt b/requirements/dev.txt
index c22b06a..ee4b735 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -3,7 +3,7 @@ brotlipy==0.7.0
 cchardet==2.1.1
 chardet==3.0.4
 coverage==4.5.1
-cython==0.28.2
+cython==0.29.36
 flake8==3.5.0
 gunicorn==19.7.1
 isort==4.3.4