diff --git a/requirements.dev.txt b/requirements.dev.txt
index 2a06ec09d746da65c9131246bfdb3421a86a92c3..982a8548a499f91ce48271ecdcdfd0145de2d661 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -1,5 +1,5 @@
 flake8==3.7.4
-Cython==0.29.3
+Cython==0.29.4
 nose==1.3.7
 pylint==1.9.4
 pytest==4.2.0