diff --git a/docs/requirements.txt b/docs/requirements.txt
index a5a16995..09c3c509 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,7 +4,7 @@ arrow==0.10.0
 asn1crypto==0.24.0
 attrs==18.2.0
 autobahn==0.15.0
-Babel==2.5.1
+Babel==2.9.1
 backports.ssl-match-hostname==3.5.0.1
 bcrypt==3.1.0
 certifi==2017.11.5