diff --git a/requirements.txt b/requirements.txt
index 32dc598..42871fa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,3 +27,4 @@ django-auditlog==0.4.3
 django-phonenumber-field==1.3.0
 paho-mqtt==1.3.0
 django-autocomplete-light==3.2.10
+six==1.10.0