diff --git a/bin/zulip-send b/bin/zulip-send
index 3cd31ad..b314863 100755
--- a/bin/zulip-send
+++ b/bin/zulip-send
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 # zulip-send -- Sends a message to the specified recipients.
 
diff --git a/bots/check-mirroring b/bots/check-mirroring
index 50a4718..bfc5588 100755
--- a/bots/check-mirroring
+++ b/bots/check-mirroring
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 import sys
 import time
 import optparse
diff --git a/bots/check-rabbitmq-consumers b/bots/check-rabbitmq-consumers
index fd3661b..4f4c7ff 100755
--- a/bots/check-rabbitmq-consumers
+++ b/bots/check-rabbitmq-consumers
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 
 import sys
 import time
diff --git a/bots/check-rabbitmq-queue b/bots/check-rabbitmq-queue
index 5c9af8d..ba359f3 100755
--- a/bots/check-rabbitmq-queue
+++ b/bots/check-rabbitmq-queue
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 
 import sys
 import re
diff --git a/bots/cron_file_helper.py b/bots/cron_file_helper.py
index 7aa6460..b61609c 100644
--- a/bots/cron_file_helper.py
+++ b/bots/cron_file_helper.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 import time
 
 def nagios_from_file(results_file):
diff --git a/bots/gcal-bot b/bots/gcal-bot
index ff33d7b..90b92aa 100755
--- a/bots/gcal-bot
+++ b/bots/gcal-bot
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 import sys
 import time
 import datetime
diff --git a/bots/irc-mirror.py b/bots/irc-mirror.py
index b5102ad..40af27a 100644
--- a/bots/irc-mirror.py
+++ b/bots/irc-mirror.py
@@ -1,4 +1,4 @@
-#! /usr/bin/env python
+#! /usr/bin/env python2.7
 #
 # EXPERIMENTAL
 # IRC <=> Zulip mirroring bot
@@ -92,11 +92,11 @@ class IRCBot(irc.bot.SingleServerIRCBot):
                 return
             self.dcc_connect(address, port)
 
-usage = """python irc-mirror.py --server=IRC_SERVER --channel=<CHANNEL> --nick-prefix=<NICK> [optional args]
+usage = """python2.7 irc-mirror.py --server=IRC_SERVER --channel=<CHANNEL> --nick-prefix=<NICK> [optional args]
 
 Example:
 
-python irc-mirror.py --irc-server=127.0.0.1 --channel='#test' --nick-prefix=username
+python2.7 irc-mirror.py --irc-server=127.0.0.1 --channel='#test' --nick-prefix=username
   --site=https://zulip.example.com --user=irc-bot@example.com
   --api-key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
 
diff --git a/bots/jabber_mirror.py b/bots/jabber_mirror.py
index 7146d14..3f609a3 100755
--- a/bots/jabber_mirror.py
+++ b/bots/jabber_mirror.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright (C) 2014 Zulip, Inc.
 #
 # Permission is hereby granted, free of charge, to any person
diff --git a/bots/jabber_mirror_backend.py b/bots/jabber_mirror_backend.py
index b86cbe7..c22f189 100755
--- a/bots/jabber_mirror_backend.py
+++ b/bots/jabber_mirror_backend.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python2.7
 #
 # Copyright (C) 2013 Permabit, Inc.
 # Copyright (C) 2013--2014 Zulip, Inc.
diff --git a/bots/log2zulip b/bots/log2zulip
index 2c3bfac..d8750c8 100755
--- a/bots/log2zulip
+++ b/bots/log2zulip
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python2.7
 import subprocess
 import os
 import sys
diff --git a/bots/process_ccache b/bots/process_ccache
index 091f946..89363b6 100755
--- a/bots/process_ccache
+++ b/bots/process_ccache
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python2.7
 import sys
 import subprocess
 import base64
diff --git a/bots/sync-public-streams b/bots/sync-public-streams
index a535e76..e890586 100755
--- a/bots/sync-public-streams
+++ b/bots/sync-public-streams
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 import sys
 import os
 import logging
diff --git a/bots/tddium-notify-humbug b/bots/tddium-notify-humbug
index 6ab221c..2a97225 100755
--- a/bots/tddium-notify-humbug
+++ b/bots/tddium-notify-humbug
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright (C) 2012 Zulip, Inc.
 #
 # Permission is hereby granted, free of charge, to any person
diff --git a/bots/zephyr_mirror.py b/bots/zephyr_mirror.py
index 356725e..26b56b6 100755
--- a/bots/zephyr_mirror.py
+++ b/bots/zephyr_mirror.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright (C) 2012 Zulip, Inc.
 #
 # Permission is hereby granted, free of charge, to any person
diff --git a/bots/zephyr_mirror_backend.py b/bots/zephyr_mirror_backend.py
index 77148d3..39e33be 100755
--- a/bots/zephyr_mirror_backend.py
+++ b/bots/zephyr_mirror_backend.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # Copyright (C) 2012 Zulip, Inc.
 #
 # Permission is hereby granted, free of charge, to any person
diff --git a/examples/create-user b/examples/create-user
index c492fdd..6f2a379 100755
--- a/examples/create-user
+++ b/examples/create-user
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 # Copyright © 2012-2014 Zulip, Inc.
diff --git a/examples/edit-message b/examples/edit-message
index af61fb7..609f291 100755
--- a/examples/edit-message
+++ b/examples/edit-message
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 # Copyright © 2012 Zulip, Inc.
diff --git a/examples/get-public-streams b/examples/get-public-streams
index c71c354..2137d13 100755
--- a/examples/get-public-streams
+++ b/examples/get-public-streams
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 # Copyright © 2012 Zulip, Inc.
diff --git a/examples/list-members b/examples/list-members
index d7829ae..70c1c1b 100755
--- a/examples/list-members
+++ b/examples/list-members
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 # Copyright © 2014 Zulip, Inc.
diff --git a/examples/list-subscriptions b/examples/list-subscriptions
index 67d26b9..6223dab 100755
--- a/examples/list-subscriptions
+++ b/examples/list-subscriptions
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 # Copyright © 2012 Zulip, Inc.
diff --git a/examples/print-events b/examples/print-events
index 06c1450..a3d0457 100755
--- a/examples/print-events
+++ b/examples/print-events
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 # Copyright © 2012 Zulip, Inc.
diff --git a/examples/print-messages b/examples/print-messages
index eda3503..f1a521e 100755
--- a/examples/print-messages
+++ b/examples/print-messages
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 # Copyright © 2012 Zulip, Inc.
diff --git a/examples/print-next-message b/examples/print-next-message
index 901a19a..cf41e32 100755
--- a/examples/print-next-message
+++ b/examples/print-next-message
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 # Copyright © 2012 Zulip, Inc.
diff --git a/examples/send-message b/examples/send-message
index 582ae6b..f257e57 100755
--- a/examples/send-message
+++ b/examples/send-message
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 # Copyright © 2012 Zulip, Inc.
diff --git a/examples/subscribe b/examples/subscribe
index 6e94d36..548a02e 100755
--- a/examples/subscribe
+++ b/examples/subscribe
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 # Copyright © 2012 Zulip, Inc.
diff --git a/examples/unsubscribe b/examples/unsubscribe
index 4e9d69a..3b72173 100755
--- a/examples/unsubscribe
+++ b/examples/unsubscribe
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 # Copyright © 2012 Zulip, Inc.
diff --git a/integrations/asana/zulip_asana_config.py b/integrations/asana/zulip_asana_config.py
index 6020f6d..c14db0b 100644
--- a/integrations/asana/zulip_asana_config.py
+++ b/integrations/asana/zulip_asana_config.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Copyright © 2014 Zulip, Inc.
diff --git a/integrations/asana/zulip_asana_mirror b/integrations/asana/zulip_asana_mirror
index c0ee4d8..1fbb0be 100755
--- a/integrations/asana/zulip_asana_mirror
+++ b/integrations/asana/zulip_asana_mirror
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Asana integration for Zulip
diff --git a/integrations/basecamp/zulip_basecamp_config.py b/integrations/basecamp/zulip_basecamp_config.py
index c343a69..024ace0 100644
--- a/integrations/basecamp/zulip_basecamp_config.py
+++ b/integrations/basecamp/zulip_basecamp_config.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Copyright © 2014 Zulip, Inc.
diff --git a/integrations/basecamp/zulip_basecamp_mirror b/integrations/basecamp/zulip_basecamp_mirror
index f56fccf..abacb31 100755
--- a/integrations/basecamp/zulip_basecamp_mirror
+++ b/integrations/basecamp/zulip_basecamp_mirror
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Zulip mirror of Basecamp activity
diff --git a/integrations/codebase/zulip_codebase_config.py b/integrations/codebase/zulip_codebase_config.py
index d13d80d..fb37981 100644
--- a/integrations/codebase/zulip_codebase_config.py
+++ b/integrations/codebase/zulip_codebase_config.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Copyright © 2014 Zulip, Inc.
diff --git a/integrations/codebase/zulip_codebase_mirror b/integrations/codebase/zulip_codebase_mirror
index 6f7d8fc..c3e7863 100755
--- a/integrations/codebase/zulip_codebase_mirror
+++ b/integrations/codebase/zulip_codebase_mirror
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Zulip mirror of Codebase HQ activity
diff --git a/integrations/git/post-receive b/integrations/git/post-receive
index df8b97f..eaeb1e5 100755
--- a/integrations/git/post-receive
+++ b/integrations/git/post-receive
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Zulip notification post-receive hook.
diff --git a/integrations/git/zulip_git_config.py b/integrations/git/zulip_git_config.py
index 9b3157a..b0be000 100644
--- a/integrations/git/zulip_git_config.py
+++ b/integrations/git/zulip_git_config.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Copyright © 2014 Zulip, Inc.
diff --git a/integrations/hg/zulip-changegroup.py b/integrations/hg/zulip-changegroup.py
index f1ec24d..427702c 100755
--- a/integrations/hg/zulip-changegroup.py
+++ b/integrations/hg/zulip-changegroup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Zulip hook for Mercurial changeset pushes.
diff --git a/integrations/nagios/nagios-notify-zulip b/integrations/nagios/nagios-notify-zulip
index 6145952..8f2dd28 100755
--- a/integrations/nagios/nagios-notify-zulip
+++ b/integrations/nagios/nagios-notify-zulip
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 import optparse
 import zulip
 
diff --git a/integrations/perforce/git_p4.py b/integrations/perforce/git_p4.py
index 494b0ef..ffe2fc9 100644
--- a/integrations/perforce/git_p4.py
+++ b/integrations/perforce/git_p4.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 #
 # git-p4.py -- A tool for bidirectional operation between a Perforce depot and git.
 #
diff --git a/integrations/perforce/zulip_change-commit.py b/integrations/perforce/zulip_change-commit.py
index 3596267..f1cdee4 100755
--- a/integrations/perforce/zulip_change-commit.py
+++ b/integrations/perforce/zulip_change-commit.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Copyright © 2012-2014 Zulip, Inc.
diff --git a/integrations/perforce/zulip_perforce_config.py b/integrations/perforce/zulip_perforce_config.py
index 2928a0c..de36c30 100644
--- a/integrations/perforce/zulip_perforce_config.py
+++ b/integrations/perforce/zulip_perforce_config.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Copyright © 2014 Zulip, Inc.
diff --git a/integrations/rss/rss-bot b/integrations/rss/rss-bot
index 0511e2b..9aa7925 100755
--- a/integrations/rss/rss-bot
+++ b/integrations/rss/rss-bot
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # RSS integration for Zulip
diff --git a/integrations/svn/post-commit b/integrations/svn/post-commit
index dabfb12..7f67e13 100755
--- a/integrations/svn/post-commit
+++ b/integrations/svn/post-commit
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Zulip notification post-commit hook.
diff --git a/integrations/svn/zulip_svn_config.py b/integrations/svn/zulip_svn_config.py
index 70a84c9..a69fc04 100644
--- a/integrations/svn/zulip_svn_config.py
+++ b/integrations/svn/zulip_svn_config.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Copyright © 2014 Zulip, Inc.
diff --git a/integrations/twitter/twitter-bot b/integrations/twitter/twitter-bot
index 30c890f..ec3ad03 100755
--- a/integrations/twitter/twitter-bot
+++ b/integrations/twitter/twitter-bot
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Twitter integration for Zulip
diff --git a/integrations/twitter/twitter-search-bot b/integrations/twitter/twitter-search-bot
index 64e42d8..64938f5 100755
--- a/integrations/twitter/twitter-search-bot
+++ b/integrations/twitter/twitter-search-bot
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Twitter search integration for Zulip
diff --git a/setup.py b/setup.py
index e12955d..129303d 100644
--- a/setup.py
+++ b/setup.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 
 import os