diff --git a/.travis.yml b/.travis.yml
index 2f0f880ebd..5354360f8c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,11 +1,9 @@
 language: node_js
+sudo: false
+services:
+  - mongodb
 node_js:
   - '4.1'
-before_install:
-  - "sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10"
-  - "echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' | sudo tee /etc/apt/sources.list.d/mongodb.list"
-  - "sudo apt-get update"
-  - "sudo apt-get install mongodb-org-server"
 before_script:
   - 'npm install -g grunt-cli mocha'
   - cp config.json.example config.json
diff --git a/package.json b/package.json
index da8eff1113..d089129b97 100644
--- a/package.json
+++ b/package.json
@@ -58,7 +58,7 @@
     "merge-stream": "^1.0.0",
     "method-override": "~2.2.0",
     "moment": "~2.8.3",
-    "mongoose": "~3.8.23",
+    "mongoose": "~4.2.3",
     "mongoose-id-autoinc": "~2013.7.14-4",
     "morgan": "^1.6.1",
     "nconf": "~0.6.9",
diff --git a/test/api-legacy/challenges.coffee b/test/api-legacy/challenges.coffee
index 8fa3afe9ce..30e5ccad8d 100644
--- a/test/api-legacy/challenges.coffee
+++ b/test/api-legacy/challenges.coffee
@@ -161,7 +161,7 @@ describe "Challenges", ->
         # Now let's handle if challenge was deleted, but didn't get to update all the users (an error)
         unset = $unset: {}
         unset["$unset"]["dailys." + len + ".challenge.broken"] = 1
-        User.findByIdAndUpdate user._id, unset, (err, user) ->
+        User.findByIdAndUpdate user._id, unset, {new: true}, (err, user) ->
           expect(err).to.not.exist
           expect(user.dailys[len].challenge.broken).to.not.exist
           request.post(baseURL + "/user/tasks/" + daily.id + "/up").end (err, res) ->
@@ -175,6 +175,7 @@ describe "Challenges", ->
     User.findByIdAndUpdate user._id,
       $set:
         "contributor.admin": true
+    , {new: true}
     , (err, _user) ->
       expect(err).to.not.exist
       async.parallel [
@@ -205,7 +206,8 @@ describe "Challenges", ->
   it "User creates a non-tavern challenge with prize, deletes it, gets refund", (done) ->
     User.findByIdAndUpdate user._id,
       $set:
-        "balance": 8
+        "balance": 8,
+    , {new: true}
     , (err, user) ->
       expect(err).to.not.be.ok
       request.post(baseURL + "/challenges").send(
@@ -234,7 +236,8 @@ describe "Challenges", ->
   it "User creates a tavern challenge with prize, deletes it, and does not get refund", (done) ->
     User.findByIdAndUpdate user._id,
       $set:
-        "balance": 8
+        "balance": 8,
+    , {new: true}
     , (err, user) ->
       expect(err).to.not.be.ok
       request.post(baseURL + "/challenges").send(
@@ -312,7 +315,7 @@ describe "Challenges", ->
     context "non-owner that is an admin", () ->
 
       beforeEach (done) ->
-        User.findByIdAndUpdate(user._id, { 'contributor.admin': true }, done)
+        User.findByIdAndUpdate(user._id, { 'contributor.admin': true }, {new: true}, done)
           
       it 'can edit challenge', (done) ->
         challenge.name = 'foobar'
diff --git a/test/api-legacy/coupons.coffee b/test/api-legacy/coupons.coffee
index c6fb4f36d7..e0fd380bf5 100644
--- a/test/api-legacy/coupons.coffee
+++ b/test/api-legacy/coupons.coffee
@@ -6,7 +6,7 @@ Coupon = require("../../website/src/models/coupon").model
 makeSudoUser = (usr, cb) ->
   registerNewUser ->
     sudoUpdate = { "$set" : { "contributor.sudo" : true } }
-    User.findByIdAndUpdate user._id, sudoUpdate, (err, _user) ->
+    User.findByIdAndUpdate user._id, sudoUpdate, {new: true}, (err, _user) ->
       usr = _user
       cb()
   , true
diff --git a/test/api-legacy/party.coffee b/test/api-legacy/party.coffee
index 83adc7df0c..93dadf5b12 100644
--- a/test/api-legacy/party.coffee
+++ b/test/api-legacy/party.coffee
@@ -58,6 +58,7 @@ describe "Party", ->
           User.findByIdAndUpdate user._id,
             $set:
               "stats.lvl": 50
+          , {new: true}
           , (err, _user) ->
             cb(null, _user)
         (_user, cb) ->
@@ -142,6 +143,7 @@ describe "Party", ->
                     User.findByIdAndUpdate user._id,
                       $set:
                         "items.quests.vice3": 1
+                    , {new: true}
                     , cb
 
                 (_user, cb) ->
@@ -281,6 +283,7 @@ describe "Party", ->
                       Group.findByIdAndUpdate group._id,
                         $set:
                           "quest.progress.hp": 0
+                      , {new: true}
                       , cb2
                   ], cb
                 (_group, cb) ->
diff --git a/test/api-legacy/users.coffee b/test/api-legacy/users.coffee
index 5e992cbcf6..69411cf792 100644
--- a/test/api-legacy/users.coffee
+++ b/test/api-legacy/users.coffee
@@ -27,6 +27,7 @@ describe "Users", ->
             User.findByIdAndUpdate userToDelete._id,
               $set:
                 "balance": 4
+              , {new: true}
               , (err, _user) ->
                 cb()
 
@@ -88,6 +89,7 @@ describe "Users", ->
           User.findByIdAndUpdate user._id,
             $set:
               "balance": 4
+            , {new: true}
             , (err, _user) ->
               async.waterfall [
                 (cb) ->
diff --git a/website/src/controllers/challenges.js b/website/src/controllers/challenges.js
index 5219503537..6ac40b2571 100644
--- a/website/src/controllers/challenges.js
+++ b/website/src/controllers/challenges.js
@@ -230,7 +230,7 @@ api.update = function(req, res, next){
       // before-save / after-save comparison to determine if we need to sync to users
       before = _before;
       var attrs = _.pick(req.body, 'name shortName description habits dailys todos rewards date'.split(' '));
-      Challenge.findByIdAndUpdate(cid, {$set:attrs}, cb);
+      Challenge.findByIdAndUpdate(cid, {$set:attrs}, {new: true}, cb);
     },
     function(saved, cb) {
 
@@ -271,7 +271,7 @@ function closeChal(cid, broken, cb) {
     function(_removed, cb2) {
       removed = _removed;
       var pull = {'$pull':{}}; pull['$pull'][_removed._id] = 1;
-      Group.findByIdAndUpdate(_removed.group, pull);
+      Group.findByIdAndUpdate(_removed.group, {new: true}, pull);
       User.find({_id:{$in: removed.members}}, cb2);
     },
     function(users, cb2) {
@@ -370,7 +370,7 @@ api.join = function(req, res, next){
 
   async.waterfall([
     function(cb) {
-      Challenge.findByIdAndUpdate(cid, {$addToSet:{members:user._id}}, cb);
+      Challenge.findByIdAndUpdate(cid, {$addToSet:{members:user._id}}, {new: true}, cb);
     },
     function(chal, cb) {
 
@@ -403,7 +403,7 @@ api.leave = function(req, res, next){
 
   async.waterfall([
     function(cb){
-      Challenge.findByIdAndUpdate(cid, {$pull:{members:user._id}}, cb);
+      Challenge.findByIdAndUpdate(cid, {$pull:{members:user._id}}, {new: true}, cb);
     },
     function(chal, cb){
 
diff --git a/website/src/controllers/unsubscription.js b/website/src/controllers/unsubscription.js
index d0ef89f920..f839b11551 100644
--- a/website/src/controllers/unsubscription.js
+++ b/website/src/controllers/unsubscription.js
@@ -13,9 +13,9 @@ api.unsubscribe = function(req, res, next){
   if(data._id){
     User.update({_id: data._id}, {
       $set: {'preferences.emailNotifications.unsubscribeFromAll': true}
-    }, {multi: false}, function(err, nAffected){
+    }, {multi: false}, function(err, updateRes){
       if(err) return next(err);
-      if(nAffected !== 1) return res.json(404, {err: 'User not found'});
+      if(updateRes.n !== 1) return res.json(404, {err: 'User not found'});
 
       res.send('<h1>' + i18n.t('unsubscribedSuccessfully', null, req.language) + '</h1>' + i18n.t('unsubscribedTextUsers', null, req.language));
     });