diff --git a/docs/requirements.txt b/docs/requirements.txt
index 003a06a..3a3cb19 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -3,7 +3,7 @@ Jinja2==2.10.3
 MarkupSafe==1.1.1
 Pygments==2.4.2
 alabaster==0.7.12
-babel==2.7.0
+babel==2.9.1
 docutils==0.15.2
 gitdb==0.6.4
 imagesize==1.1.0