diff --git a/requirements-docs.txt b/requirements-docs.txt
index a2659fb..673389e 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.9
-Babel==2.3.4
+Babel==2.9.1
 docutils==0.12
 Jinja2==2.11.3
 MarkupSafe==0.23