diff --git a/docs/requirements.txt b/docs/requirements.txt
index 1cdabdb9..43701a8c 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
 certifi==2017.7.27.1
 chardet==3.0.4
 CommonMark==0.5.4