diff --git a/requirements.txt b/requirements.txt
index 217d291f..7cf90325 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-cython==0.27.3
+cython>=0.27.3
 -e git+git://git.louiz.org/slixmpp#egg=slixmpp
 aiodns==1.1.1
 pycares==2.3.0