diff --git a/wordcloud_demo/requirements.txt b/wordcloud_demo/requirements.txt
index 8bc10c9..4a4cef8 100644
--- a/wordcloud_demo/requirements.txt
+++ b/wordcloud_demo/requirements.txt
@@ -1,7 +1,7 @@
 alabaster==0.7.10
 astroid==1.5.3
 attrs==17.3.0
-Babel==2.5.1
+Babel==2.9.1
 bleach==2.1.2
 certifi==2017.11.5
 chardet==3.0.4