diff --git a/build/requirements.txt b/build/requirements.txt
index 5e9bbe3..ce5be4b 100644
--- a/build/requirements.txt
+++ b/build/requirements.txt
@@ -6,7 +6,7 @@ attrs==19.1.0
 Babel==2.6.0
 backcall==0.1.0
 binaryornot==0.4.4
-bleach==3.1.0
+bleach==3.3.0
 bokeh==1.0.4
 boto3==1.9.130
 botocore==1.12.130