diff --git a/docs_requirements.txt b/docs_requirements.txt
index 31050f7..baff362 100644
--- a/docs_requirements.txt
+++ b/docs_requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.10
-Babel==2.5.1
+Babel==2.9.1
 docutils==0.14
 imagesize==0.7.1
 Jinja2==2.9.6