diff --git a/docs/requirements.txt b/docs/requirements.txt
index 0d7bd36..55603f9 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,6 +1,6 @@
 alabaster==0.7.9
 appdirs==1.4.0
-Babel==2.3.4
+Babel==2.9.1
 CommonMark==0.5.4
 docutils==0.13.1
 imagesize==0.7.1