diff --git a/requirements.txt b/requirements.txt
index e65dd05..fc1543f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.7
-Babel==2.3.4
+Babel==2.9.1
 certifi==2016.2.28
 docutils==0.12
 imagesize==0.7.1