diff --git a/docs/requirements.txt b/docs/requirements.txt
index bd87598..dfa2cc9 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,5 +1,5 @@
 alabaster==0.7.9
-Babel==2.3.4
+Babel==2.9.1
 docutils==0.13.1
 imagesize==0.7.1
 Jinja2>=2.10.1