diff --git a/services/notifications/app.js b/services/notifications/app.js
index f83d7f0282..1aad0f6e18 100644
--- a/services/notifications/app.js
+++ b/services/notifications/app.js
@@ -15,6 +15,7 @@ const app = express()
 const methodOverride = require('method-override')
 const bodyParser = require('body-parser')
 const errorHandler = require('errorhandler')
+const mongodb = require('./app/js/mongodb')
 const controller = require('./app/js/NotificationsController')
 
 metrics.memory.monitor(logger)
@@ -62,9 +63,18 @@ const port =
     Settings.internal != null ? Settings.internal.notifications : undefined,
     (x1) => x1.port
   ) || 3042
-app.listen(port, host, () =>
-  logger.info(`notifications starting up, listening on ${host}:${port}`)
-)
+
+mongodb
+  .waitForDb()
+  .then(() => {
+    app.listen(port, host, () =>
+      logger.info(`notifications starting up, listening on ${host}:${port}`)
+    )
+  })
+  .catch((err) => {
+    logger.fatal({ err }, 'Cannot connect to mongo. Exiting.')
+    process.exit(1)
+  })
 
 function __guard__(value, transform) {
   return typeof value !== 'undefined' && value !== null
diff --git a/services/notifications/app/js/HealthCheckController.js b/services/notifications/app/js/HealthCheckController.js
index dc468473fe..3350f35bbe 100644
--- a/services/notifications/app/js/HealthCheckController.js
+++ b/services/notifications/app/js/HealthCheckController.js
@@ -11,7 +11,7 @@
  * DS207: Consider shorter variations of null checks
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
-const { ObjectId } = require('mongojs')
+const { db, ObjectId } = require('./mongodb')
 const request = require('request')
 const async = require('async')
 const _ = require('underscore')
@@ -19,12 +19,6 @@ const settings = require('settings-sharelatex')
 const { port } = settings.internal.notifications
 const logger = require('logger-sharelatex')
 
-const mongojs = require('mongojs')
-const Settings = require('settings-sharelatex')
-const db = mongojs(Settings.mongo != null ? Settings.mongo.url : undefined, [
-  'notifications'
-])
-
 module.exports = {
   check(callback) {
     const user_id = ObjectId()
diff --git a/services/notifications/app/js/Notifications.js b/services/notifications/app/js/Notifications.js
index d808ecb2c5..f26e8fa898 100644
--- a/services/notifications/app/js/Notifications.js
+++ b/services/notifications/app/js/Notifications.js
@@ -12,13 +12,8 @@
  * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
  */
 let Notifications
-const Settings = require('settings-sharelatex')
 const logger = require('logger-sharelatex')
-const mongojs = require('mongojs')
-const db = mongojs(Settings.mongo != null ? Settings.mongo.url : undefined, [
-  'notifications'
-])
-const { ObjectId } = require('mongojs')
+const { db, ObjectId } = require('./mongodb')
 const metrics = require('metrics-sharelatex')
 
 module.exports = Notifications = {
@@ -30,9 +25,7 @@ module.exports = Notifications = {
       user_id: ObjectId(user_id),
       templateKey: { $exists: true }
     }
-    return db.notifications.find(query, (err, notifications) =>
-      callback(err, notifications)
-    )
+    db.notifications.find(query).toArray(callback)
   },
 
   _countExistingNotifications(user_id, notification, callback) {
@@ -85,7 +78,7 @@ module.exports = Notifications = {
           return callback(err)
         }
       }
-      return db.notifications.update(
+      db.notifications.updateOne(
         { user_id: doc.user_id, key: notification.key },
         { $set: doc },
         { upsert: true },
@@ -100,7 +93,7 @@ module.exports = Notifications = {
       _id: ObjectId(notification_id)
     }
     const updateOperation = { $unset: { templateKey: true, messageOpts: true } }
-    return db.notifications.update(searchOps, updateOperation, callback)
+    db.notifications.updateOne(searchOps, updateOperation, callback)
   },
 
   removeNotificationKey(user_id, notification_key, callback) {
@@ -109,19 +102,19 @@ module.exports = Notifications = {
       key: notification_key
     }
     const updateOperation = { $unset: { templateKey: true } }
-    return db.notifications.update(searchOps, updateOperation, callback)
+    db.notifications.updateOne(searchOps, updateOperation, callback)
   },
 
   removeNotificationByKeyOnly(notification_key, callback) {
     const searchOps = { key: notification_key }
     const updateOperation = { $unset: { templateKey: true } }
-    return db.notifications.update(searchOps, updateOperation, callback)
+    db.notifications.updateOne(searchOps, updateOperation, callback)
   },
 
   // hard delete of doc, rather than removing the templateKey
   deleteNotificationByKeyOnly(notification_key, callback) {
     const searchOps = { key: notification_key }
-    return db.notifications.remove(searchOps, { justOne: true }, callback)
+    db.notifications.deleteOne(searchOps, callback)
   }
 }
 ;['getUserNotifications', 'addNotification'].map((method) =>
diff --git a/services/notifications/app/js/mongodb.js b/services/notifications/app/js/mongodb.js
new file mode 100644
index 0000000000..d52fa2c2cf
--- /dev/null
+++ b/services/notifications/app/js/mongodb.js
@@ -0,0 +1,28 @@
+const Settings = require('settings-sharelatex')
+const { MongoClient, ObjectId } = require('mongodb')
+
+const clientPromise = MongoClient.connect(
+  Settings.mongo.url,
+  Settings.mongo.options
+)
+
+let setupDbPromise
+async function waitForDb() {
+  if (!setupDbPromise) {
+    setupDbPromise = setupDb()
+  }
+  await setupDbPromise
+}
+
+const db = {}
+async function setupDb() {
+  const internalDb = (await clientPromise).db()
+
+  db.notifications = internalDb.collection('notifications')
+}
+
+module.exports = {
+  db,
+  ObjectId,
+  waitForDb
+}
diff --git a/services/notifications/config/settings.defaults.js b/services/notifications/config/settings.defaults.js
index 136aa3a594..db91ba7672 100644
--- a/services/notifications/config/settings.defaults.js
+++ b/services/notifications/config/settings.defaults.js
@@ -7,6 +7,10 @@ module.exports = {
   },
 
   mongo: {
+    options: {
+      useUnifiedTopology:
+        (process.env.MONGO_USE_UNIFIED_TOPOLOGY || 'true') === 'true'
+    },
     url:
       process.env.MONGO_CONNECTION_STRING ||
       `mongodb://${process.env.MONGO_HOST || 'localhost'}/sharelatex`
diff --git a/services/notifications/package-lock.json b/services/notifications/package-lock.json
index e1da64df24..4dd1dcad15 100644
--- a/services/notifications/package-lock.json
+++ b/services/notifications/package-lock.json
@@ -17,6 +17,7 @@
       "version": "7.9.4",
       "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.9.4.tgz",
       "integrity": "sha512-rjP8ahaDy/ouhrvCoU1E5mqaitWrxwuNGU+dy1EpaoK48jZay4MdkskKGIMHLZNewg8sAsqpGSREJwP0zH3YQA==",
+      "dev": true,
       "requires": {
         "@babel/types": "^7.9.0",
         "jsesc": "^2.5.1",
@@ -27,7 +28,8 @@
         "source-map": {
           "version": "0.5.7",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w="
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
         }
       }
     },
@@ -35,6 +37,7 @@
       "version": "7.8.3",
       "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.8.3.tgz",
       "integrity": "sha512-BCxgX1BC2hD/oBlIFUgOCQDOPV8nSINxCwM3o93xP4P9Fq6aV5sgv2cOOITDMtCfQ+3PvHp3l689XZvAM9QyOA==",
+      "dev": true,
       "requires": {
         "@babel/helper-get-function-arity": "^7.8.3",
         "@babel/template": "^7.8.3",
@@ -45,6 +48,7 @@
       "version": "7.8.3",
       "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.8.3.tgz",
       "integrity": "sha512-FVDR+Gd9iLjUMY1fzE2SR0IuaJToR4RkCDARVfsBBPSP53GEqSFjD8gNyxg246VUyc/ALRxFaAK8rVG7UT7xRA==",
+      "dev": true,
       "requires": {
         "@babel/types": "^7.8.3"
       }
@@ -53,6 +57,7 @@
       "version": "7.8.3",
       "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.8.3.tgz",
       "integrity": "sha512-3x3yOeyBhW851hroze7ElzdkeRXQYQbFIb7gLK1WQYsw2GWDay5gAJNw1sWJ0VFP6z5J1whqeXH/WCdCjZv6dA==",
+      "dev": true,
       "requires": {
         "@babel/types": "^7.8.3"
       }
@@ -60,7 +65,8 @@
     "@babel/helper-validator-identifier": {
       "version": "7.9.0",
       "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.9.0.tgz",
-      "integrity": "sha512-6G8bQKjOh+of4PV/ThDm/rRqlU7+IGoJuofpagU5GlEl29Vv0RGqqt86ZGRV8ZuSOY3o+8yXl5y782SMcG7SHw=="
+      "integrity": "sha512-6G8bQKjOh+of4PV/ThDm/rRqlU7+IGoJuofpagU5GlEl29Vv0RGqqt86ZGRV8ZuSOY3o+8yXl5y782SMcG7SHw==",
+      "dev": true
     },
     "@babel/highlight": {
       "version": "7.8.0",
@@ -76,7 +82,8 @@
     "@babel/parser": {
       "version": "7.9.4",
       "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.9.4.tgz",
-      "integrity": "sha512-bC49otXX6N0/VYhgOMh4gnP26E9xnDZK3TmbNpxYzzz9BQLBosQwfyOe9/cXUU3txYhTzLCbcqd5c8y/OmCjHA=="
+      "integrity": "sha512-bC49otXX6N0/VYhgOMh4gnP26E9xnDZK3TmbNpxYzzz9BQLBosQwfyOe9/cXUU3txYhTzLCbcqd5c8y/OmCjHA==",
+      "dev": true
     },
     "@babel/runtime": {
       "version": "7.8.0",
@@ -101,6 +108,7 @@
       "version": "7.8.6",
       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.8.6.tgz",
       "integrity": "sha512-zbMsPMy/v0PWFZEhQJ66bqjhH+z0JgMoBWuikXybgG3Gkd/3t5oQ1Rw2WQhnSrsOmsKXnZOx15tkC4qON/+JPg==",
+      "dev": true,
       "requires": {
         "@babel/code-frame": "^7.8.3",
         "@babel/parser": "^7.8.6",
@@ -111,6 +119,7 @@
           "version": "7.8.3",
           "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
           "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+          "dev": true,
           "requires": {
             "@babel/highlight": "^7.8.3"
           }
@@ -119,6 +128,7 @@
           "version": "7.9.0",
           "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.9.0.tgz",
           "integrity": "sha512-lJZPilxX7Op3Nv/2cvFdnlepPXDxi29wxteT57Q965oc5R9v86ztx0jfxVrTcBk8C2kcPkkDa2Z4T3ZsPPVWsQ==",
+          "dev": true,
           "requires": {
             "@babel/helper-validator-identifier": "^7.9.0",
             "chalk": "^2.0.0",
@@ -131,6 +141,7 @@
       "version": "7.9.0",
       "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.9.0.tgz",
       "integrity": "sha512-jAZQj0+kn4WTHO5dUZkZKhbFrqZE7K5LAQ5JysMnmvGij+wOdr+8lWqPeW0BcF4wFwrEXXtdGO7wcV6YPJcf3w==",
+      "dev": true,
       "requires": {
         "@babel/code-frame": "^7.8.3",
         "@babel/generator": "^7.9.0",
@@ -147,6 +158,7 @@
           "version": "7.8.3",
           "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.8.3.tgz",
           "integrity": "sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==",
+          "dev": true,
           "requires": {
             "@babel/highlight": "^7.8.3"
           }
@@ -155,6 +167,7 @@
           "version": "7.9.0",
           "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.9.0.tgz",
           "integrity": "sha512-lJZPilxX7Op3Nv/2cvFdnlepPXDxi29wxteT57Q965oc5R9v86ztx0jfxVrTcBk8C2kcPkkDa2Z4T3ZsPPVWsQ==",
+          "dev": true,
           "requires": {
             "@babel/helper-validator-identifier": "^7.9.0",
             "chalk": "^2.0.0",
@@ -165,6 +178,7 @@
           "version": "4.1.1",
           "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
           "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
           "requires": {
             "ms": "^2.1.1"
           }
@@ -172,7 +186,8 @@
         "ms": {
           "version": "2.1.2",
           "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
-          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
         }
       }
     },
@@ -180,6 +195,7 @@
       "version": "7.9.0",
       "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.9.0.tgz",
       "integrity": "sha512-BS9JKfXkzzJl8RluW4JGknzpiUV7ZrvTayM6yfqLTVBEnFtyowVIOu6rqxRd5cVO6yGoWf4T8u8dgK9oB+GCng==",
+      "dev": true,
       "requires": {
         "@babel/helper-validator-identifier": "^7.9.0",
         "lodash": "^4.17.13",
@@ -1238,6 +1254,7 @@
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
       "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
       "requires": {
         "color-convert": "^1.9.0"
       }
@@ -1252,23 +1269,11 @@
         "picomatch": "^2.0.4"
       }
     },
-    "append-transform": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-1.0.0.tgz",
-      "integrity": "sha512-P009oYkeHyU742iSZJzZZywj4QRJdnTWffaKuJQLablCZ1uz6/cW4yaRgcDaoQ+uwOxxnt0gRUcwfsNP2ri0gw==",
-      "requires": {
-        "default-require-extensions": "^2.0.0"
-      }
-    },
-    "archy": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
-      "integrity": "sha1-+cjBN1fMHde8N5rHeyxipcKGjEA="
-    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
       "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
       "requires": {
         "sprintf-js": "~1.0.2"
       }
@@ -1542,9 +1547,9 @@
       "dev": true
     },
     "bson": {
-      "version": "1.1.4",
-      "resolved": "https://registry.npmjs.org/bson/-/bson-1.1.4.tgz",
-      "integrity": "sha512-S/yKGU1syOMzO86+dGpg2qGoDL0zvzcb262G+gqEy6TgP6rt6z6qxSFX/8X6vLC91P7G7C3nLs0+bvDzmvBA3Q=="
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/bson/-/bson-1.1.5.tgz",
+      "integrity": "sha512-kDuEzldR21lHciPQAIulLs1LZlCXdLziXI6Mb/TDkwXhb//UORJNPXgcRs2CuO4H0DcMkpfT3/ySsP3unoZjBg=="
     },
     "buffer-equal-constant-time": {
       "version": "1.0.1",
@@ -1573,17 +1578,6 @@
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
       "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg=="
     },
-    "caching-transform": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/caching-transform/-/caching-transform-3.0.2.tgz",
-      "integrity": "sha512-Mtgcv3lh3U0zRii/6qVgQODdPA4G3zhG+jtbCWj39RXuUFTMzH0vcdMtaJS1jPowd+It2Pqr6y3NJMQqOqCE2w==",
-      "requires": {
-        "hasha": "^3.0.0",
-        "make-dir": "^2.0.0",
-        "package-hash": "^3.0.0",
-        "write-file-atomic": "^2.4.2"
-      }
-    },
     "callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -1593,7 +1587,8 @@
     "camelcase": {
       "version": "5.3.1",
       "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
-      "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg=="
+      "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
+      "dev": true
     },
     "camelcase-keys": {
       "version": "6.1.1",
@@ -1629,6 +1624,7 @@
       "version": "2.4.2",
       "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
       "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+      "dev": true,
       "requires": {
         "ansi-styles": "^3.2.1",
         "escape-string-regexp": "^1.0.5",
@@ -1638,12 +1634,14 @@
         "has-flag": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
-          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0="
+          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+          "dev": true
         },
         "supports-color": {
           "version": "5.5.0",
           "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
           "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+          "dev": true,
           "requires": {
             "has-flag": "^3.0.0"
           }
@@ -1702,6 +1700,7 @@
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
       "integrity": "sha512-PYeGSEmmHM6zvoef2w8TPzlrnNpXIjTipYK780YswmIP9vjxmd6Y2a3CB2Ks6/AU8NHjZugXvo8w3oWM2qnwXA==",
+      "dev": true,
       "requires": {
         "string-width": "^3.1.0",
         "strip-ansi": "^5.2.0",
@@ -1711,17 +1710,20 @@
         "emoji-regex": {
           "version": "7.0.3",
           "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-7.0.3.tgz",
-          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA=="
+          "integrity": "sha512-CwBLREIQ7LvYFB0WyRvwhq5N5qPhc6PMjD6bYggFlI5YyDgl+0vxq5VHbMOFqLg7hfWzmu8T5Z1QofhmTIhItA==",
+          "dev": true
         },
         "is-fullwidth-code-point": {
           "version": "2.0.0",
           "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
-          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8="
+          "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8=",
+          "dev": true
         },
         "string-width": {
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
           "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
           "requires": {
             "emoji-regex": "^7.0.1",
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@@ -1739,6 +1741,7 @@
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           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
           "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
           "requires": {
             "p-locate": "^3.0.0",
             "path-exists": "^3.0.0"
@@ -7237,6 +6699,7 @@
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
           "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
           "requires": {
             "p-limit": "^2.0.0"
           }
@@ -7245,6 +6708,7 @@
           "version": "3.1.0",
           "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
           "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
           "requires": {
             "emoji-regex": "^7.0.1",
             "is-fullwidth-code-point": "^2.0.0",
@@ -7257,6 +6721,7 @@
       "version": "13.1.1",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
       "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+      "dev": true,
       "requires": {
         "camelcase": "^5.0.0",
         "decamelize": "^1.2.0"
diff --git a/services/notifications/package.json b/services/notifications/package.json
index 420c4fdcbc..e5fdc4c5bd 100644
--- a/services/notifications/package.json
+++ b/services/notifications/package.json
@@ -25,7 +25,7 @@
     "logger-sharelatex": "^2.2.0",
     "method-override": "^3.0.0",
     "metrics-sharelatex": "^2.6.2",
-    "mongojs": "^3.1.0",
+    "mongodb": "^3.6.0",
     "node-statsd": "0.1.1",
     "request": "^2.88.2",
     "settings-sharelatex": "^1.1.0",
diff --git a/services/notifications/test/unit/js/NotificationsTests.js b/services/notifications/test/unit/js/NotificationsTests.js
index f0feaee15f..ed33556423 100644
--- a/services/notifications/test/unit/js/NotificationsTests.js
+++ b/services/notifications/test/unit/js/NotificationsTests.js
@@ -19,7 +19,7 @@ const should = chai.should()
 const modulePath = '../../../app/js/Notifications.js'
 const SandboxedModule = require('sandboxed-module')
 const assert = require('assert')
-const { ObjectId } = require('mongojs')
+const { ObjectId } = require('mongodb')
 
 const user_id = '51dc93e6fb625a261300003b'
 const notification_id = 'fb625a26f09d'
@@ -27,25 +27,19 @@ const notification_key = 'notification-key'
 
 describe('Notifications Tests', function () {
   beforeEach(function () {
-    const self = this
-    this.findStub = sinon.stub()
-    this.insertStub = sinon.stub()
+    this.findToArrayStub = sinon.stub()
+    this.findStub = sinon.stub().returns({ toArray: this.findToArrayStub })
     this.countStub = sinon.stub()
-    this.updateStub = sinon.stub()
-    this.removeStub = sinon.stub()
-    this.mongojs = () => {
-      return {
-        notifications: {
-          update: self.mongojsUpdate,
-          find: this.findStub,
-          insert: this.insertStub,
-          count: this.countStub,
-          update: this.updateStub,
-          remove: this.removeStub
-        }
+    this.updateOneStub = sinon.stub()
+    this.deleteOneStub = sinon.stub()
+    this.db = {
+      notifications: {
+        find: this.findStub,
+        count: this.countStub,
+        updateOne: this.updateOneStub,
+        deleteOne: this.deleteOneStub
       }
     }
-    this.mongojs.ObjectId = ObjectId
 
     this.notifications = SandboxedModule.require(modulePath, {
       requires: {
@@ -54,7 +48,7 @@ describe('Notifications Tests', function () {
           error() {}
         },
         'settings-sharelatex': {},
-        mongojs: this.mongojs,
+        './mongodb': { db: this.db, ObjectId },
         'metrics-sharelatex': { timeAsyncMethod: sinon.stub() }
       },
       globals: {
@@ -73,7 +67,7 @@ describe('Notifications Tests', function () {
 
   describe('getUserNotifications', function () {
     return it('should find all notifications and return i', function (done) {
-      this.findStub.callsArgWith(1, null, this.stubbedNotificationArray)
+      this.findToArrayStub.callsArgWith(0, null, this.stubbedNotificationArray)
       return this.notifications.getUserNotifications(
         user_id,
         (err, notifications) => {
@@ -106,7 +100,7 @@ describe('Notifications Tests', function () {
         user_id: this.stubbedNotification.user_id,
         key: 'notification-key'
       }
-      this.updateStub.yields()
+      this.updateOneStub.yields()
       return this.countStub.yields(null, 0)
     })
 
@@ -117,7 +111,7 @@ describe('Notifications Tests', function () {
         (err) => {
           expect(err).not.exists
           sinon.assert.calledWith(
-            this.updateStub,
+            this.updateOneStub,
             this.expectedQuery,
             { $set: this.expectedDocument },
             { upsert: true }
@@ -138,7 +132,7 @@ describe('Notifications Tests', function () {
           this.stubbedNotification,
           (err) => {
             expect(err).not.exists
-            sinon.assert.notCalled(this.updateStub)
+            sinon.assert.notCalled(this.updateOneStub)
             return done()
           }
         )
@@ -152,7 +146,7 @@ describe('Notifications Tests', function () {
           (err) => {
             expect(err).not.exists
             sinon.assert.calledWith(
-              this.updateStub,
+              this.updateOneStub,
               this.expectedQuery,
               { $set: this.expectedDocument },
               { upsert: true }
@@ -192,7 +186,7 @@ describe('Notifications Tests', function () {
           (err) => {
             expect(err).not.exists
             sinon.assert.calledWith(
-              this.updateStub,
+              this.updateOneStub,
               this.expectedQuery,
               { $set: this.expectedDocument },
               { upsert: true }
@@ -227,7 +221,7 @@ describe('Notifications Tests', function () {
           this.stubbedNotification,
           (err) => {
             ;(err instanceof Error).should.equal(true)
-            sinon.assert.notCalled(this.updateStub)
+            sinon.assert.notCalled(this.updateOneStub)
             return done()
           }
         )
@@ -237,7 +231,7 @@ describe('Notifications Tests', function () {
 
   describe('removeNotificationId', function () {
     return it('should mark the notification id as read', function (done) {
-      this.updateStub.callsArgWith(2, null)
+      this.updateOneStub.callsArgWith(2, null)
 
       return this.notifications.removeNotificationId(
         user_id,
@@ -250,8 +244,8 @@ describe('Notifications Tests', function () {
           const updateOperation = {
             $unset: { templateKey: true, messageOpts: true }
           }
-          assert.deepEqual(this.updateStub.args[0][0], searchOps)
-          assert.deepEqual(this.updateStub.args[0][1], updateOperation)
+          assert.deepEqual(this.updateOneStub.args[0][0], searchOps)
+          assert.deepEqual(this.updateOneStub.args[0][1], updateOperation)
           return done()
         }
       )
@@ -260,7 +254,7 @@ describe('Notifications Tests', function () {
 
   describe('removeNotificationKey', function () {
     return it('should mark the notification key as read', function (done) {
-      this.updateStub.callsArgWith(2, null)
+      this.updateOneStub.callsArgWith(2, null)
 
       return this.notifications.removeNotificationKey(
         user_id,
@@ -273,8 +267,8 @@ describe('Notifications Tests', function () {
           const updateOperation = {
             $unset: { templateKey: true }
           }
-          assert.deepEqual(this.updateStub.args[0][0], searchOps)
-          assert.deepEqual(this.updateStub.args[0][1], updateOperation)
+          assert.deepEqual(this.updateOneStub.args[0][0], searchOps)
+          assert.deepEqual(this.updateOneStub.args[0][1], updateOperation)
           return done()
         }
       )
@@ -283,15 +277,15 @@ describe('Notifications Tests', function () {
 
   describe('removeNotificationByKeyOnly', function () {
     return it('should mark the notification key as read', function (done) {
-      this.updateStub.callsArgWith(2, null)
+      this.updateOneStub.callsArgWith(2, null)
 
       return this.notifications.removeNotificationByKeyOnly(
         notification_key,
         (err) => {
           const searchOps = { key: notification_key }
           const updateOperation = { $unset: { templateKey: true } }
-          assert.deepEqual(this.updateStub.args[0][0], searchOps)
-          assert.deepEqual(this.updateStub.args[0][1], updateOperation)
+          assert.deepEqual(this.updateOneStub.args[0][0], searchOps)
+          assert.deepEqual(this.updateOneStub.args[0][1], updateOperation)
           return done()
         }
       )
@@ -300,15 +294,13 @@ describe('Notifications Tests', function () {
 
   return describe('deleteNotificationByKeyOnly', function () {
     return it('should completely remove the notification', function (done) {
-      this.removeStub.callsArgWith(2, null)
+      this.deleteOneStub.callsArgWith(1, null)
 
       return this.notifications.deleteNotificationByKeyOnly(
         notification_key,
         (err) => {
           const searchOps = { key: notification_key }
-          const opts = { justOne: true }
-          assert.deepEqual(this.removeStub.args[0][0], searchOps)
-          assert.deepEqual(this.removeStub.args[0][1], opts)
+          assert.deepEqual(this.deleteOneStub.args[0][0], searchOps)
           return done()
         }
       )