diff --git a/site/yasm/requirements.txt b/site/yasm/requirements.txt
index 5b257e04..04c59b29 100644
--- a/site/yasm/requirements.txt
+++ b/site/yasm/requirements.txt
@@ -2,7 +2,7 @@ alabaster==0.7.12
 appnope==0.1.0
 atomicwrites==1.1.5
 attrs==18.1.0
-Babel==2.6.0
+Babel==2.9.1
 backcall==0.1.0
 beautifulsoup4==4.6.0
 cachetools==2.1.0