diff --git a/requirements.dev.txt b/requirements.dev.txt
index 88ffb2acf024ed19812a510a0340a436a40367b5..0ed56688df3f09cef5364696e2ee86b5e9a18e6e 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -1,5 +1,5 @@
 flake8==3.5.0
-Cython==0.28.1
+Cython==0.29.3
 nose==1.3.7
 pycodestyle==2.3.1
 pylint==1.8.3