diff --git a/requirements.txt b/requirements.txt
index 1682864..16157cb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 alabaster==0.7.9
 argh==0.26.2
-Babel==2.3.4
+Babel==2.9.1
 backports-abc==0.4
 certifi==2017.4.17
 docutils==0.12