diff --git a/requirements.txt b/requirements.txt
index 5d836d5..fa1a59e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.10
-Babel==2.4.0
+Babel==2.9.1
 certifi==2017.4.17
 chardet==3.0.4
 CommonMark==0.5.4