diff --git a/site-cookbooks/5apps-xmpp_server/recipes/default.rb b/site-cookbooks/5apps-xmpp_server/recipes/default.rb
index 6a4bfa4..9405fb2 100644
--- a/site-cookbooks/5apps-xmpp_server/recipes/default.rb
+++ b/site-cookbooks/5apps-xmpp_server/recipes/default.rb
@@ -18,7 +18,8 @@ end
 
 apt_repository "prosody" do
   uri "https://packages.prosody.im/debian"
-  distribution node["lsb"]["codename"]
+  # 15.04 doesn't get new packages anymore, use the ones built for 16.04
+  distribution node["lsb"]["codename"] == "vivid" ? "xenial" : node["lsb"]["codename"]
   components ["main"]
   key "https://prosody.im/files/prosody-debian-packages.key"
 end
@@ -29,8 +30,10 @@ service "prosody" do
   action [:enable]
 end
 
-include_recipe "5apps-xmpp_server::letsencrypt"
+unless node.chef_environment == "development"
+  include_recipe "5apps-xmpp_server::letsencrypt"
 
-# backup the data dir and the config files
-node.override["backup"]["archives"]["prosody"] = ["/var/lib/prosody", "/etc/prosody"]
-include_recipe "backup"
+  # backup the data dir and the config files
+  node.override["backup"]["archives"]["prosody"] = ["/var/lib/prosody", "/etc/prosody"]
+  include_recipe "backup"
+end