diff --git a/setup.py b/setup.py
index 04831a8..b8cb12d 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@
 ]
 
 dev_requires = [
-    "cython>=0.23",
+    "cython>=0.27.3",
     "flake8>=2.5",
     "pytest>=2.8",
     "sphinx-rtd-theme>=0.1.9",