diff --git a/lib/core/typed.js b/lib/core/typed.js
index 4e284d5a4..aa988f32f 100644
--- a/lib/core/typed.js
+++ b/lib/core/typed.js
@@ -111,7 +111,7 @@ exports.create = function create(type) {
       from: 'Fraction',
       to: 'number',
       convert: function (x) {
-        return x.toNumber();
+        return x.valueOf();
       }
     }
   ];
diff --git a/lib/type/fraction/Fraction.js b/lib/type/fraction/Fraction.js
index 1afe4cacb..9d8417ccd 100644
--- a/lib/type/fraction/Fraction.js
+++ b/lib/type/fraction/Fraction.js
@@ -6,15 +6,6 @@ var Fraction = require('fraction.js');
 Fraction.prototype.type = 'Fraction';
 Fraction.prototype.isFraction = true;
 
-/**
- * Get the primitive value of a Fraction, a number
- * @return {number} Returns a number
- */
-// TODO: remove this when Fraction.js supports this itself.
-Fraction.prototype.valueOf = function () {
-  return this.toNumber();
-};
-
 /**
  * Get a JSON representation of a Fraction containing type information
  * @returns {Object} Returns a JSON object structured as:
diff --git a/package.json b/package.json
index 2c49b7480..96b6ba7e9 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
   ],
   "dependencies": {
     "decimal.js": "^4.0.2",
-    "fraction.js": "^1.7.0",
+    "fraction.js": "^1.9.0",
     "tiny-emitter": "^1.0.0",
     "typed-function": "^0.8.2"
   },