diff --git a/requirements.txt b/requirements.txt
index 2ae86be..a00889c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.6
-Babel==2.0
+Babel==2.9.1
 backports.ssl-match-hostname==3.4.0.2
 certifi==14.5.14
 Cython==0.23