--- a/contrib/provision/roles/prosody/tasks/extra-modules.yml	Fri Aug 12 22:26:01 2016 +0800
+++ b/contrib/provision/roles/prosody/tasks/extra-modules.yml	Sat Dec 03 01:27:01 2016 +0800
@@ -3,6 +3,7 @@
   hg:
     repo: https://hg.prosody.im/prosody-modules/
     dest: /var/lib/prosody/extra-modules
+    revision: default
   notify:
     - restart prosody
 ...