diff --git a/requirements_dev.txt b/requirements_dev.txt
index 4d3e388..6a08a6c 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -3,7 +3,7 @@ alabaster==0.7.12
 argh==0.26.2
 astor==0.8.0
 Babel==2.7.0
-bleach==3.1.0
+bleach==3.3.0
 bson==0.5.8
 bump2version==0.5.11
 certifi==2019.9.11