diff --git a/requirements.txt b/requirements.txt
index d9b1c18..d6eb6a8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,5 +10,6 @@ configparser==3.5
 mozsvc==0.9
 futures==3.0
 soupsieve==1.9.5
+umemcache==1.6.3
 https://github.com/mozilla-services/tokenserver/archive/1.5.11.zip
 https://github.com/mozilla-services/server-syncstorage/archive/1.8.0.zip