diff --git a/index.js b/index.js
index f1d7e42..40f4553 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,3 @@
-var Sequelize = require('sequelize');
-
 function JsonField(db, modelName, fieldName, options) {
   var self = this;
   options = options || {};
@@ -20,7 +18,7 @@ function JsonField(db, modelName, fieldName, options) {
   });
 
   var model = {
-    type: options.type || Sequelize.TEXT,
+    type: options.type || db.constructor.TEXT,
     get: function() {
       var currentValue = this.getDataValue(fieldName);
       if (typeof currentValue == 'string') {
diff --git a/package.json b/package.json
index e0fa4de..7675953 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "mocha": "^2.1.0",
     "sqlite3": "^3.0.5"
   },
-  "dependencies": {
-    "sequelize": "^3.6.0"
+  "peerDependencies": {
+    "sequelize": "^ 3 || ^4"
   }
 }