diff --git a/docs/requirements.txt b/docs/requirements.txt
index 80fb822..fac2e39 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
 boto3==1.4.7
 botocore==1.7.39
 certifi==2017.7.27.1