diff --git a/MD/MembraneLook/requirements.txt b/MD/MembraneLook/requirements.txt
index 43e2603..7467cea 100644
--- a/MD/MembraneLook/requirements.txt
+++ b/MD/MembraneLook/requirements.txt
@@ -348,7 +348,7 @@ txaio==18.8.1
 typed-ast==1.3.0
 typing==3.6.6
 tzlocal==1.5.1
-ujson==1.35
+ujson==5.4.0
 unicodecsv==0.14.1
 urllib3==1.24.1
 virtualenv==16.0.0