diff --git a/pydeps b/pydeps
--- a/pydeps
+++ b/pydeps
@@ -20,4 +20,6 @@ service_identity==0.2
 Pillow==2.4.0
 faulthandler==2.3
 treq==0.2.1
-mock==1.0.1
\ No newline at end of file
+mock==1.0.1
+toposort==1.0
+