diff --git a/dev_server/requirements.txt b/dev_server/requirements.txt
index 0b26095..61182e2 100644
--- a/dev_server/requirements.txt
+++ b/dev_server/requirements.txt
@@ -1,6 +1,6 @@
 attrs==19.2.0
 backcall==0.1.0
-bleach==3.1.0
+bleach==3.3.0
 Click==7.0
 cloudpickle==1.2.2
 cycler==0.10.0