diff --git a/requirements.txt b/requirements.txt
index ac3338d..4871ee7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 alabaster==0.7.6
 attrs==15.2.0
-Babel==1.3
+Babel==2.9.1
 backports.ssl-match-hostname==3.4.0.2
 certifi==2015.4.28
 cffi==1.5.2