diff --git a/src/database/mongo.js b/src/database/mongo.js
index 99e045d9f4..9ab35feba2 100644
--- a/src/database/mongo.js
+++ b/src/database/mongo.js
@@ -98,6 +98,7 @@ mongoModule.getConnectionOptions = function () {
 		reconnectTries: 3600,
 		reconnectInterval: 1000,
 		autoReconnect: true,
+		useNewUrlParser: true,
 	};
 
 	return _.merge(connOptions, nconf.get('mongo:options') || {});
diff --git a/src/database/mongo/hash.js b/src/database/mongo/hash.js
index bfbeb5cb6c..1298e6e292 100644
--- a/src/database/mongo/hash.js
+++ b/src/database/mongo/hash.js
@@ -46,7 +46,7 @@ module.exports = function (db, module) {
 		if (data.hasOwnProperty('')) {
 			delete data[''];
 		}
-		db.collection('objects').update({ _key: key }, { $set: data }, { upsert: true, w: 1 }, function (err) {
+		db.collection('objects').updateOne({ _key: key }, { $set: data }, { upsert: true, w: 1 }, function (err) {
 			if (err) {
 				return callback(err);
 			}
@@ -208,8 +208,8 @@ module.exports = function (db, module) {
 		}
 		var data = {};
 		field = helpers.fieldToString(field);
-		data[field] = '';
-		db.collection('objects').findOne({ _key: key }, { fields: data }, function (err, item) {
+		data[field] = 1;
+		db.collection('objects').findOne({ _key: key }, { projection: data }, function (err, item) {
 			callback(err, !!item && item[field] !== undefined && item[field] !== null);
 		});
 	};
@@ -222,10 +222,10 @@ module.exports = function (db, module) {
 		var data = {};
 		fields.forEach(function (field) {
 			field = helpers.fieldToString(field);
-			data[field] = '';
+			data[field] = 1;
 		});
 
-		db.collection('objects').findOne({ _key: key }, { fields: data }, function (err, item) {
+		db.collection('objects').findOne({ _key: key }, { projection: data }, function (err, item) {
 			if (err) {
 				return callback(err);
 			}
@@ -259,7 +259,7 @@ module.exports = function (db, module) {
 			data[field] = '';
 		});
 
-		db.collection('objects').update({ _key: key }, { $unset: data }, function (err) {
+		db.collection('objects').updateOne({ _key: key }, { $unset: data }, function (err) {
 			if (err) {
 				return callback(err);
 			}
@@ -317,7 +317,7 @@ module.exports = function (db, module) {
 		}
 
 
-		db.collection('objects').findAndModify({ _key: key }, {}, { $inc: data }, { new: true, upsert: true }, function (err, result) {
+		db.collection('objects').findOneAndUpdate({ _key: key }, { $inc: data }, { returnOriginal: false, upsert: true }, function (err, result) {
 			if (err) {
 				return callback(err);
 			}
diff --git a/src/database/mongo/list.js b/src/database/mongo/list.js
index b0b87ae922..219cd53be5 100644
--- a/src/database/mongo/list.js
+++ b/src/database/mongo/list.js
@@ -18,7 +18,7 @@ module.exports = function (db, module) {
 			}
 
 			if (exists) {
-				db.collection('objects').update({ _key: key }, { $push: { array: { $each: [value], $position: 0 } } }, { upsert: true, w: 1 }, function (err) {
+				db.collection('objects').updateOne({ _key: key }, { $push: { array: { $each: [value], $position: 0 } } }, { upsert: true, w: 1 }, function (err) {
 					callback(err);
 				});
 			} else {
@@ -33,7 +33,7 @@ module.exports = function (db, module) {
 			return callback();
 		}
 		value = helpers.valueToString(value);
-		db.collection('objects').update({ _key: key }, { $push: { array: value } }, { upsert: true, w: 1 }, function (err) {
+		db.collection('objects').updateOne({ _key: key }, { $push: { array: value } }, { upsert: true, w: 1 }, function (err) {
 			callback(err);
 		});
 	};
@@ -48,7 +48,7 @@ module.exports = function (db, module) {
 				return callback(err);
 			}
 
-			db.collection('objects').update({ _key: key }, { $pop: { array: 1 } }, function (err) {
+			db.collection('objects').updateOne({ _key: key }, { $pop: { array: 1 } }, function (err) {
 				callback(err, (value && value.length) ? value[0] : null);
 			});
 		});
@@ -61,7 +61,7 @@ module.exports = function (db, module) {
 		}
 		value = helpers.valueToString(value);
 
-		db.collection('objects').update({ _key: key }, { $pull: { array: value } }, function (err) {
+		db.collection('objects').updateOne({ _key: key }, { $pull: { array: value } }, function (err) {
 			callback(err);
 		});
 	};
@@ -76,7 +76,7 @@ module.exports = function (db, module) {
 				return callback(err);
 			}
 
-			db.collection('objects').update({ _key: key }, { $set: { array: value } }, function (err) {
+			db.collection('objects').updateOne({ _key: key }, { $set: { array: value } }, function (err) {
 				callback(err);
 			});
 		});
diff --git a/src/database/mongo/main.js b/src/database/mongo/main.js
index 55a29e6ff9..1b23bc3409 100644
--- a/src/database/mongo/main.js
+++ b/src/database/mongo/main.js
@@ -12,7 +12,7 @@ module.exports = function (db, module) {
 
 	module.emptydb = function (callback) {
 		callback = callback || helpers.noop;
-		db.collection('objects').remove({}, function (err) {
+		db.collection('objects').deleteMany({}, function (err) {
 			if (err) {
 				return callback(err);
 			}
@@ -35,7 +35,7 @@ module.exports = function (db, module) {
 		if (!key) {
 			return callback();
 		}
-		db.collection('objects').remove({ _key: key }, function (err) {
+		db.collection('objects').deleteMany({ _key: key }, function (err) {
 			if (err) {
 				return callback(err);
 			}
@@ -49,7 +49,7 @@ module.exports = function (db, module) {
 		if (!Array.isArray(keys) || !keys.length) {
 			return callback();
 		}
-		db.collection('objects').remove({ _key: { $in: keys } }, function (err) {
+		db.collection('objects').deleteMany({ _key: { $in: keys } }, function (err) {
 			if (err) {
 				return callback(err);
 			}
@@ -97,14 +97,14 @@ module.exports = function (db, module) {
 		if (!key) {
 			return callback();
 		}
-		db.collection('objects').findAndModify({ _key: key }, {}, { $inc: { data: 1 } }, { new: true, upsert: true }, function (err, result) {
+		db.collection('objects').findOneAndUpdate({ _key: key }, { $inc: { data: 1 } }, { returnOriginal: false, upsert: true }, function (err, result) {
 			callback(err, result && result.value ? result.value.data : null);
 		});
 	};
 
 	module.rename = function (oldKey, newKey, callback) {
 		callback = callback || helpers.noop;
-		db.collection('objects').update({ _key: oldKey }, { $set: { _key: newKey } }, { multi: true }, function (err) {
+		db.collection('objects').updateMany({ _key: oldKey }, { $set: { _key: newKey } }, function (err) {
 			if (err) {
 				return callback(err);
 			}
diff --git a/src/database/mongo/sets.js b/src/database/mongo/sets.js
index 4f807b3922..b66772639c 100644
--- a/src/database/mongo/sets.js
+++ b/src/database/mongo/sets.js
@@ -13,7 +13,7 @@ module.exports = function (db, module) {
 			array[index] = helpers.valueToString(element);
 		});
 
-		db.collection('objects').update({
+		db.collection('objects').updateOne({
 			_key: key,
 		}, {
 			$addToSet: {
@@ -74,7 +74,7 @@ module.exports = function (db, module) {
 				callback(err);
 			});
 		} else {
-			db.collection('objects').update({ _key: key }, { $pullAll: { members: value } }, function (err) {
+			db.collection('objects').updateOne({ _key: key }, { $pullAll: { members: value } }, function (err) {
 				callback(err);
 			});
 		}
@@ -87,7 +87,7 @@ module.exports = function (db, module) {
 		}
 		value = helpers.valueToString(value);
 
-		db.collection('objects').update({ _key: { $in: keys } }, { $pull: { members: value } }, { multi: true }, function (err) {
+		db.collection('objects').updateMany({ _key: { $in: keys } }, { $pull: { members: value } }, function (err) {
 			callback(err);
 		});
 	};
@@ -98,7 +98,7 @@ module.exports = function (db, module) {
 		}
 		value = helpers.valueToString(value);
 
-		db.collection('objects').findOne({ _key: key, members: value }, { _id: 0, members: 0 }, function (err, item) {
+		db.collection('objects').findOne({ _key: key, members: value }, { projection: { _id: 0, members: 0 } }, function (err, item) {
 			callback(err, item !== null && item !== undefined);
 		});
 	};
@@ -112,7 +112,7 @@ module.exports = function (db, module) {
 			values[i] = helpers.valueToString(values[i]);
 		}
 
-		db.collection('objects').findOne({ _key: key }, { _id: 0, _key: 0 }, function (err, items) {
+		db.collection('objects').findOne({ _key: key }, { projection: { _id: 0, _key: 0 } }, function (err, items) {
 			if (err) {
 				return callback(err);
 			}
@@ -131,7 +131,7 @@ module.exports = function (db, module) {
 		}
 		value = helpers.valueToString(value);
 
-		db.collection('objects').find({ _key: { $in: sets }, members: value }, { _id: 0, members: 0 }).toArray(function (err, result) {
+		db.collection('objects').find({ _key: { $in: sets }, members: value }, { projection: { _id: 0, members: 0 } }).toArray(function (err, result) {
 			if (err) {
 				return callback(err);
 			}
@@ -184,7 +184,7 @@ module.exports = function (db, module) {
 		if (!key) {
 			return callback(null, 0);
 		}
-		db.collection('objects').findOne({ _key: key }, { _id: 0 }, function (err, data) {
+		db.collection('objects').findOne({ _key: key }, { projection: { _id: 0 } }, function (err, data) {
 			callback(err, data ? data.members.length : 0);
 		});
 	};
diff --git a/src/database/mongo/sorted.js b/src/database/mongo/sorted.js
index d4eb7a8522..9ec82f5a68 100644
--- a/src/database/mongo/sorted.js
+++ b/src/database/mongo/sorted.js
@@ -32,9 +32,9 @@ module.exports = function (db, module) {
 			return callback();
 		}
 
-		var fields = { _id: 0, value: 1 };
-		if (withScores) {
-			fields.score = 1;
+		var fields = { _id: 0, _key: 0 };
+		if (!withScores) {
+			fields.score = 0;
 		}
 
 		if (Array.isArray(key)) {
@@ -62,7 +62,7 @@ module.exports = function (db, module) {
 			limit = 0;
 		}
 
-		db.collection('objects').find({ _key: key }, { fields: fields })
+		db.collection('objects').find({ _key: key }, { projection: fields })
 			.limit(limit)
 			.skip(start)
 			.sort({ score: sort })
@@ -70,6 +70,7 @@ module.exports = function (db, module) {
 				if (err || !data) {
 					return callback(err);
 				}
+
 				if (reverse) {
 					data.reverse();
 				}
@@ -117,12 +118,12 @@ module.exports = function (db, module) {
 			query.score.$lte = max;
 		}
 
-		var fields = { _id: 0, value: 1 };
-		if (withScores) {
-			fields.score = 1;
+		var fields = { _id: 0, _key: 0 };
+		if (!withScores) {
+			fields.score = 0;
 		}
 
-		db.collection('objects').find(query, { fields: fields })
+		db.collection('objects').find(query, { projection: fields })
 			.limit(count)
 			.skip(start)
 			.sort({ score: sort })
@@ -155,7 +156,7 @@ module.exports = function (db, module) {
 			query.score.$lte = max;
 		}
 
-		db.collection('objects').count(query, function (err, count) {
+		db.collection('objects').countDocuments(query, function (err, count) {
 			callback(err, count || 0);
 		});
 	};
@@ -164,7 +165,7 @@ module.exports = function (db, module) {
 		if (!key) {
 			return callback(null, 0);
 		}
-		db.collection('objects').count({ _key: key }, function (err, count) {
+		db.collection('objects').countDocuments({ _key: key }, function (err, count) {
 			count = parseInt(count, 10);
 			callback(err, count || 0);
 		});
@@ -220,7 +221,7 @@ module.exports = function (db, module) {
 				return callback(err, null);
 			}
 
-			db.collection('objects').count({
+			db.collection('objects').countDocuments({
 				$or: [
 					{
 						_key: key,
@@ -273,7 +274,7 @@ module.exports = function (db, module) {
 			return callback(null, null);
 		}
 		value = helpers.valueToString(value);
-		db.collection('objects').findOne({ _key: key, value: value }, { fields: { _id: 0, score: 1 } }, function (err, result) {
+		db.collection('objects').findOne({ _key: key, value: value }, { projection: { _id: 0, _key: 0, value: 0 } }, function (err, result) {
 			callback(err, result ? result.score : null);
 		});
 	};
@@ -283,7 +284,7 @@ module.exports = function (db, module) {
 			return callback();
 		}
 		value = helpers.valueToString(value);
-		db.collection('objects').find({ _key: { $in: keys }, value: value }, { _id: 0, _key: 1, score: 1 }).toArray(function (err, result) {
+		db.collection('objects').find({ _key: { $in: keys }, value: value }, { projection: { _id: 0, value: 0 } }).toArray(function (err, result) {
 			if (err) {
 				return callback(err);
 			}
@@ -306,7 +307,7 @@ module.exports = function (db, module) {
 			return callback(null, null);
 		}
 		values = values.map(helpers.valueToString);
-		db.collection('objects').find({ _key: key, value: { $in: values } }, { _id: 0, value: 1, score: 1 }).toArray(function (err, result) {
+		db.collection('objects').find({ _key: key, value: { $in: values } }, { projection: { _id: 0, _key: 0 } }).toArray(function (err, result) {
 			if (err) {
 				return callback(err);
 			}
@@ -333,7 +334,7 @@ module.exports = function (db, module) {
 			return callback();
 		}
 		value = helpers.valueToString(value);
-		db.collection('objects').findOne({ _key: key, value: value }, { _id: 0, value: 1 }, function (err, result) {
+		db.collection('objects').findOne({ _key: key, value: value }, { projection: { _id: 0, _key: 0, score: 0 } }, function (err, result) {
 			callback(err, !!result);
 		});
 	};
@@ -343,17 +344,19 @@ module.exports = function (db, module) {
 			return callback();
 		}
 		values = values.map(helpers.valueToString);
-		db.collection('objects').find({ _key: key, value: { $in: values } }, { fields: { _id: 0, value: 1 } }).toArray(function (err, results) {
+		db.collection('objects').find({ _key: key, value: { $in: values } }, { projection: { _id: 0, _key: 0, score: 0 } }).toArray(function (err, results) {
 			if (err) {
 				return callback(err);
 			}
-
-			results = results.map(function (item) {
-				return item.value;
+			var isMember = {};
+			results.forEach(function (item) {
+				if (item) {
+					isMember[item.value] = true;
+				}
 			});
 
 			values = values.map(function (value) {
-				return results.indexOf(value) !== -1;
+				return !!isMember[value];
 			});
 			callback(null, values);
 		});
@@ -364,17 +367,19 @@ module.exports = function (db, module) {
 			return callback();
 		}
 		value = helpers.valueToString(value);
-		db.collection('objects').find({ _key: { $in: keys }, value: value }, { fields: { _id: 0, _key: 1, value: 1 } }).toArray(function (err, results) {
+		db.collection('objects').find({ _key: { $in: keys }, value: value }, { projection: { _id: 0, score: 0 } }).toArray(function (err, results) {
 			if (err) {
 				return callback(err);
 			}
-
-			results = results.map(function (item) {
-				return item._key;
+			var isMember = {};
+			results.forEach(function (item) {
+				if (item) {
+					isMember[item._key] = true;
+				}
 			});
 
 			results = keys.map(function (key) {
-				return results.indexOf(key) !== -1;
+				return !!isMember[key];
 			});
 			callback(null, results);
 		});
@@ -384,7 +389,7 @@ module.exports = function (db, module) {
 		if (!Array.isArray(keys) || !keys.length) {
 			return callback(null, []);
 		}
-		db.collection('objects').find({ _key: { $in: keys } }, { _id: 0, _key: 1, value: 1 }).sort({ score: 1 }).toArray(function (err, data) {
+		db.collection('objects').find({ _key: { $in: keys } }, { projection: { _id: 0, score: 0 } }).sort({ score: 1 }).toArray(function (err, data) {
 			if (err) {
 				return callback(err);
 			}
@@ -412,7 +417,7 @@ module.exports = function (db, module) {
 		value = helpers.valueToString(value);
 		data.score = parseFloat(increment);
 
-		db.collection('objects').findAndModify({ _key: key, value: value }, {}, { $inc: data }, { new: true, upsert: true }, function (err, result) {
+		db.collection('objects').findOneAndUpdate({ _key: key, value: value }, { $inc: data }, { returnOriginal: false, upsert: true }, function (err, result) {
 			// if there is duplicate key error retry the upsert
 			// https://github.com/NodeBB/NodeBB/issues/4467
 			// https://jira.mongodb.org/browse/SERVER-14322
@@ -448,7 +453,7 @@ module.exports = function (db, module) {
 		var query = { _key: key };
 		buildLexQuery(query, min, max);
 
-		db.collection('objects').find(query, { _id: 0, value: 1 })
+		db.collection('objects').find(query, { projection: { _id: 0, _key: 0, score: 0 } })
 			.sort({ value: sort })
 			.skip(start)
 			.limit(count === -1 ? 0 : count)
@@ -469,7 +474,7 @@ module.exports = function (db, module) {
 		var query = { _key: key };
 		buildLexQuery(query, min, max);
 
-		db.collection('objects').remove(query, function (err) {
+		db.collection('objects').deleteMany(query, function (err) {
 			callback(err);
 		});
 	};
@@ -499,13 +504,12 @@ module.exports = function (db, module) {
 	module.processSortedSet = function (setKey, processFn, options, callback) {
 		var done = false;
 		var ids = [];
-		var project = { _id: 0, value: 1 };
-		if (options.withScores) {
-			project.score = 1;
+		var project = { _id: 0, _key: 0 };
+		if (!options.withScores) {
+			project.score = 0;
 		}
-		var cursor = db.collection('objects').find({ _key: setKey })
+		var cursor = db.collection('objects').find({ _key: setKey }, { projection: project })
 			.sort({ score: 1 })
-			.project(project)
 			.batchSize(options.batch);
 
 		async.whilst(
diff --git a/src/database/mongo/sorted/add.js b/src/database/mongo/sorted/add.js
index b90501feee..e71bb0568a 100644
--- a/src/database/mongo/sorted/add.js
+++ b/src/database/mongo/sorted/add.js
@@ -14,7 +14,7 @@ module.exports = function (db, module) {
 
 		value = helpers.valueToString(value);
 
-		db.collection('objects').update({ _key: key, value: value }, { $set: { score: parseFloat(score) } }, { upsert: true, w: 1 }, function (err) {
+		db.collection('objects').updateOne({ _key: key, value: value }, { $set: { score: parseFloat(score) } }, { upsert: true, w: 1 }, function (err) {
 			if (err && err.message.startsWith('E11000 duplicate key error')) {
 				return process.nextTick(module.sortedSetAdd, key, score, value, callback);
 			}
diff --git a/src/database/mongo/sorted/remove.js b/src/database/mongo/sorted/remove.js
index c9bf121e10..80f9221604 100644
--- a/src/database/mongo/sorted/remove.js
+++ b/src/database/mongo/sorted/remove.js
@@ -12,16 +12,16 @@ module.exports = function (db, module) {
 			return callback();
 		}
 		if (Array.isArray(key) && Array.isArray(value)) {
-			db.collection('objects').remove({ _key: { $in: key }, value: { $in: value } }, done);
+			db.collection('objects').deleteMany({ _key: { $in: key }, value: { $in: value } }, done);
 		} else if (Array.isArray(value)) {
 			value = value.map(helpers.valueToString);
-			db.collection('objects').remove({ _key: key, value: { $in: value } }, done);
+			db.collection('objects').deleteMany({ _key: key, value: { $in: value } }, done);
 		} else if (Array.isArray(key)) {
 			value = helpers.valueToString(value);
-			db.collection('objects').remove({ _key: { $in: key }, value: value }, done);
+			db.collection('objects').deleteMany({ _key: { $in: key }, value: value }, done);
 		} else {
 			value = helpers.valueToString(value);
-			db.collection('objects').remove({ _key: key, value: value }, done);
+			db.collection('objects').deleteOne({ _key: key, value: value }, done);
 		}
 	};
 
@@ -32,7 +32,7 @@ module.exports = function (db, module) {
 		}
 		value = helpers.valueToString(value);
 
-		db.collection('objects').remove({ _key: { $in: keys }, value: value }, function (err) {
+		db.collection('objects').deleteMany({ _key: { $in: keys }, value: value }, function (err) {
 			callback(err);
 		});
 	};
@@ -52,7 +52,7 @@ module.exports = function (db, module) {
 			query.score.$lte = parseFloat(max);
 		}
 
-		db.collection('objects').remove(query, function (err) {
+		db.collection('objects').deleteMany(query, function (err) {
 			callback(err);
 		});
 	};
diff --git a/src/upgrades/1.7.3/key_value_schema_change.js b/src/upgrades/1.7.3/key_value_schema_change.js
index a8abefb10a..882f8ff200 100644
--- a/src/upgrades/1.7.3/key_value_schema_change.js
+++ b/src/upgrades/1.7.3/key_value_schema_change.js
@@ -23,7 +23,7 @@ module.exports = {
 		var cursor;
 		async.waterfall([
 			function (next) {
-				client.collection('objects').count({
+				client.collection('objects').countDocuments({
 					_key: { $exists: true },
 					value: { $exists: true },
 					score: { $exists: false },
@@ -55,7 +55,7 @@ module.exports = {
 								}
 								delete item.expireAt;
 								if (Object.keys(item).length === 3 && item.hasOwnProperty('_key') && item.hasOwnProperty('value')) {
-									client.collection('objects').update({ _key: item._key }, { $rename: { value: 'data' } }, next);
+									client.collection('objects').updateOne({ _key: item._key }, { $rename: { value: 'data' } }, next);
 								} else {
 									next();
 								}
diff --git a/test/database/keys.js b/test/database/keys.js
index 6b187b4e3d..1051658b26 100644
--- a/test/database/keys.js
+++ b/test/database/keys.js
@@ -192,6 +192,24 @@ describe('Key methods', function () {
 				});
 			});
 		});
+
+		it('should rename multiple keys', function (done) {
+			db.sortedSetAdd('zsettorename', [1, 2, 3], ['value1', 'value2', 'value3'], function (err) {
+				assert.ifError(err);
+				db.rename('zsettorename', 'newzsetname', function (err) {
+					assert.ifError(err);
+					db.exists('zsettorename', function (err, exists) {
+						assert.ifError(err);
+						assert(!exists);
+						db.getSortedSetRange('newzsetname', 0, -1, function (err, values) {
+							assert.ifError(err);
+							assert.deepEqual(['value1', 'value2', 'value3'], values);
+							done();
+						});
+					});
+				});
+			});
+		});
 	});
 
 	describe('type', function () {