diff --git a/index.js b/index.js
index abdd8cd..444fcaf 100755
--- a/index.js
+++ b/index.js
@@ -6,13 +6,15 @@ var Base = require('db-migrate-base');
 var Promise = require('bluebird');
 var log;
 var type;
+var fs = require('fs');
 
 var MongodbDriver = Base.extend({
 
-  init: function(connection, internals, mongoString) {
+  init: function(connection, internals, mongoString, options) {
     this._super(internals);
     this.connection = connection;
     this.connectionString = mongoString;
+    this.options = options;
   },
 
   /**
@@ -291,10 +293,10 @@ var MongodbDriver = Base.extend({
       };
 
       // Get a connection to mongo
-      this.connection.connect(this.connectionString, function(err, db) {
+      this.connection.connect(this.connectionString, this.options, function(err, db) {
 
         if(err) {
-          prCB(err);
+          return prCB(err);
         }
 
         // Callback function to return mongo records
@@ -543,11 +545,19 @@ exports.connect = function(config, intern, callback) {
     extraParams.push('replicaSet=' + config.replicaSet);
   }
 
+  if (config.readPreference){
+    extraParams.push('readPreference=' + config.readPreference);
+  }
+
   if(extraParams.length > 0){
       mongoString += '?' + extraParams.join('&');
   }
 
+  if (config.options && config.options.sslCA) {
+    config.options.sslCA = Buffer.from(config.options.sslCA);
+  }
+
+  db = config.db || new MongoClient();
 
-  db = config.db || new MongoClient(new Server(host, port));
-  callback(null, new MongodbDriver(db, intern, mongoString));
+  callback(null, new MongodbDriver(db, intern, mongoString, config.options));
 };
diff --git a/package-lock.json b/package-lock.json
index 92ba38e..d3a8d2a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "db-migrate-mongodb",
-  "version": "1.4.0",
+  "version": "1.5.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -35,7 +35,7 @@
       "resolved": "https://registry.npmjs.org/db-migrate-base/-/db-migrate-base-1.3.3.tgz",
       "integrity": "sha512-gahWCfkAxNSEicwwE/D1yB3K23a3OBL2r3/+vteoijpgwkdBs1TtG6rc2N9g2Jt4iWtB0ijYnosYDhdAAMJg6g==",
       "requires": {
-        "bluebird": "3.5.0"
+        "bluebird": "^3.1.1"
       },
       "dependencies": {
         "bluebird": {
@@ -74,10 +74,10 @@
       "integrity": "sha1-aVxQvdTi+1xdNwsJHziNNwfikac=",
       "dev": true,
       "requires": {
-        "graceful-fs": "3.0.11",
-        "inherits": "2.0.3",
-        "minimatch": "1.0.0",
-        "once": "1.4.0"
+        "graceful-fs": "^3.0.2",
+        "inherits": "2",
+        "minimatch": "^1.0.0",
+        "once": "^1.3.0"
       }
     },
     "graceful-fs": {
@@ -86,7 +86,7 @@
       "integrity": "sha1-dhPHeKGv6mLyXGMKCG1/Osu92Bg=",
       "dev": true,
       "requires": {
-        "natives": "1.1.0"
+        "natives": "^1.1.0"
       }
     },
     "inherits": {
@@ -111,8 +111,8 @@
       "integrity": "sha1-4N0hILSeG3JM6NcUxSCCKpQ4V20=",
       "dev": true,
       "requires": {
-        "lru-cache": "2.7.3",
-        "sigmund": "1.0.1"
+        "lru-cache": "2",
+        "sigmund": "~1.0.0"
       }
     },
     "moment": {
@@ -135,8 +135,8 @@
       "resolved": "https://registry.npmjs.org/mongodb-core/-/mongodb-core-2.1.18.tgz",
       "integrity": "sha1-TEYTm986HwMt7ZHbSfOO7AFlkFA=",
       "requires": {
-        "bson": "1.0.4",
-        "require_optional": "1.0.1"
+        "bson": "~1.0.4",
+        "require_optional": "~1.0.0"
       }
     },
     "natives": {
@@ -151,7 +151,7 @@
       "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
       "dev": true,
       "requires": {
-        "wrappy": "1.0.2"
+        "wrappy": "1"
       }
     },
     "process-nextick-args": {
@@ -164,13 +164,13 @@
       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.2.7.tgz",
       "integrity": "sha1-BwV6y+JGeyIELTb5jFrVBwVOlbE=",
       "requires": {
-        "buffer-shims": "1.0.0",
-        "core-util-is": "1.0.2",
-        "inherits": "2.0.3",
-        "isarray": "1.0.0",
-        "process-nextick-args": "1.0.7",
-        "string_decoder": "1.0.3",
-        "util-deprecate": "1.0.2"
+        "buffer-shims": "~1.0.0",
+        "core-util-is": "~1.0.0",
+        "inherits": "~2.0.1",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~1.0.6",
+        "string_decoder": "~1.0.0",
+        "util-deprecate": "~1.0.1"
       }
     },
     "require_optional": {
@@ -178,8 +178,8 @@
       "resolved": "https://registry.npmjs.org/require_optional/-/require_optional-1.0.1.tgz",
       "integrity": "sha512-qhM/y57enGWHAe3v/NcwML6a3/vfESLe/sGM2dII+gEO0BpKRUkWZow/tyloNqJyN6kXSl3RyyM8Ll5D/sJP8g==",
       "requires": {
-        "resolve-from": "2.0.0",
-        "semver": "5.4.1"
+        "resolve-from": "^2.0.0",
+        "semver": "^5.1.0"
       }
     },
     "resolve-from": {
@@ -208,7 +208,7 @@
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
       "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
       "requires": {
-        "safe-buffer": "5.1.1"
+        "safe-buffer": "~5.1.0"
       }
     },
     "util-deprecate": {
@@ -222,9 +222,9 @@
       "integrity": "sha1-zQESKnGk+oU4chmBgtQQ3mw9uKM=",
       "dev": true,
       "requires": {
-        "diff": "1.0.8",
-        "eyes": "0.1.8",
-        "glob": "4.0.6"
+        "diff": "~1.0.8",
+        "eyes": "~0.1.6",
+        "glob": "~4.0.6"
       }
     },
     "wrappy": {
diff --git a/package.json b/package.json
index c2bd573..5e5ba11 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "db-migrate-mongodb",
-  "version": "1.4.0",
+  "version": "1.5.0",
   "description": "mongodb driver for db-migrate",
   "main": "index.js",
   "scripts": {