diff --git a/backend/Yiqi/Yiqi/requirements.txt b/backend/Yiqi/Yiqi/requirements.txt
index 2971ec8..3c19a0f 100644
--- a/backend/Yiqi/Yiqi/requirements.txt
+++ b/backend/Yiqi/Yiqi/requirements.txt
@@ -7,7 +7,7 @@ attrs==17.3.0
 autobahn==18.3.1
 Automat==0.6.0
 beautifulsoup4==4.6.0
-bleach==2.1.3
+bleach==3.1.1
 bs4==0.0.1
 certifi==2018.1.18
 cffi==1.11.2