diff --git a/requirements.dev.txt b/requirements.dev.txt
index 82806a1c..ea30e5c7 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -1,4 +1,4 @@
-Cython==0.29.10
+Cython==0.29.13
 Sphinx>=1.4.1
 psutil
 pyOpenSSL==18.0.0