diff --git a/requirements.txt b/requirements.txt
index cccabb5..88293eb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.10
-Babel==2.4.0
+Babel==2.9.1
 docutils==0.13.1
 imagesize==0.7.1
 Jinja2==2.9.6