diff --git a/composer.json b/composer.json
index 87a6119..5e8cae8 100755
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
         }
     },
     "require": {
-        "php": ">=5.3"
+        "php": ">=5.4"
     },
     "require-dev": {
         "phpunit/phpunit": "4.*",
diff --git a/src/Enum.php b/src/Enum.php
index 2ad5aea..ef992e2 100755
--- a/src/Enum.php
+++ b/src/Enum.php
@@ -15,7 +15,7 @@
  * @author Daniel Costa <danielcosta@gmail.com>
  * @author Mirosław Filip <mirfilip@gmail.com>
  */
-abstract class Enum
+abstract class Enum implements \JsonSerializable
 {
     /**
      * Enum value
@@ -73,6 +73,19 @@ public function __toString()
         return (string)$this->value;
     }
 
+    /**
+     * (PHP 5 &gt;= 5.4.0)<br/>
+     * Specify data which should be serialized to JSON
+     * @link http://php.net/manual/en/jsonserializable.jsonserialize.php
+     * @return mixed data which can be serialized by <b>json_encode</b>,
+     * which is a value of any type other than a resource.
+     */
+    public function jsonSerialize()
+    {
+        return $this->getValue();
+    }
+
+
     /**
      * Returns the names (keys) of all constants in the Enum class
      *
diff --git a/tests/EnumTest.php b/tests/EnumTest.php
index 5f16ee0..d2f7c96 100755
--- a/tests/EnumTest.php
+++ b/tests/EnumTest.php
@@ -71,6 +71,21 @@ public function testToString($expected, $enumObject)
         $this->assertSame($expected, (string) $enumObject);
     }
 
+    public function testJsonEncode()
+    {
+        $value = new EnumFixture(EnumFixture::FOO);
+        $encoded = json_encode($value);
+        $this->assertEquals($encoded, '"'.EnumFixture::FOO.'"');
+
+        $value = new EnumFixture(EnumFixture::BAR);
+        $encoded = json_encode($value);
+        $this->assertEquals($encoded, '"'.EnumFixture::BAR.'"');
+
+        $value = new EnumFixture(EnumFixture::NUMBER);
+        $encoded = json_encode($value);
+        $this->assertEquals($encoded, EnumFixture::NUMBER);
+    }
+
     public function toStringProvider() {
         return array(
             array(EnumFixture::FOO, new EnumFixture(EnumFixture::FOO)),