diff --git a/requirements.txt b/requirements.txt
index 6f3564a..dae21b9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.6
-Babel==2.1.1
+Babel==2.9.1
 docutils==0.12
 Jinja2==2.8
 MarkupSafe==0.23