diff --git a/composer.json b/composer.json
index ef06992..a808619 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
     "keywords": ["php-emoji", "emoji"],
     "license": "MIT",
     "require": {
-        "php": ">=5.4"
+        "php": ">=5.6"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.0",
diff --git a/src/LitEmoji.php b/src/LitEmoji.php
index ee2c608..c70979d 100644
--- a/src/LitEmoji.php
+++ b/src/LitEmoji.php
@@ -194,14 +194,10 @@ private static function getShortcodes()
             return self::$shortcodes;
         }
 
-        $data = require(__DIR__ . '/shortcodes-array.php');
-
         // Skip excluded shortcodes
-        foreach ($data as $code => $codepoint) {
-            if (!in_array($code, self::$excludedShortcodes)) {
-                self::$shortcodes[$code] = $codepoint;
-            }
-        }
+        self::$shortcodes = array_filter(require(__DIR__ . '/shortcodes-array.php'), function($code) {
+            return !in_array($code, self::$excludedShortcodes);
+        }, ARRAY_FILTER_USE_KEY);
 
         return self::$shortcodes;
     }