diff --git a/requirements.txt b/requirements.txt
index c39cb55..31f465e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,5 +6,5 @@ raven==5.32.0
 bcrypt==3.1.1
 dill==0.2.7.1
 redis==2.10.5
-cython==0.26
+cython==0.27.3
 datadog==0.14.0
\ No newline at end of file