diff --git a/.travis.yml b/.travis.yml
index d9ed36b..9cbd12d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,3 @@
-branches:
-  only:
-    - legacy-stable
-    - master
-    - unstable
-
 language: php
 
 php:
diff --git a/composer.json b/composer.json
index fb817e7..490e671 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
     ],
     "require": {
         "php": "^7.1",
-        "doctrine/inflector": "^1.0"
+        "doctrine/inflector": "^1.4 || ^2.0"
     },
     "conflict": {
         "symfony/form": "<3.2 || >=6.0 <999",
diff --git a/src/AbstractEnum.php b/src/AbstractEnum.php
index 3c89b5e..435ea33 100644
--- a/src/AbstractEnum.php
+++ b/src/AbstractEnum.php
@@ -2,7 +2,8 @@
 
 namespace Greg0ire\Enum;
 
-use Doctrine\Common\Inflector\Inflector;
+use Doctrine\Inflector\Inflector;
+use Doctrine\Inflector\InflectorFactory;
 use Greg0ire\Enum\Exception\InvalidEnumName;
 use Greg0ire\Enum\Exception\InvalidEnumValue;
 
@@ -19,6 +20,11 @@ abstract class AbstractEnum
 
     private static $constCache = [];
 
+    /**
+     * @var Inflector
+     */
+    private static $inflector;
+
     /**
      * Uses reflection to find the constants defined in the class and cache
      * them in a local property for performance, before returning them.
@@ -98,7 +104,11 @@ final public static function getClassPrefixedKeys(
         ?string $namespaceSeparator = null
     ): array {
         $namespaceSeparator = $namespaceSeparator ?: static::$defaultNamespaceSeparator;
-        $classKey = str_replace('\\', $namespaceSeparator, Inflector::tableize(static::class));
+        $classKey = str_replace(
+            '\\',
+            $namespaceSeparator,
+            self::inflector()->tableize(static::class)
+        );
 
         $keys = static::getKeys(function ($key) use ($namespaceSeparator, $classKey) {
             return $classKey.$namespaceSeparator.$key;
@@ -111,6 +121,15 @@ final public static function getClassPrefixedKeys(
         return $keys;
     }
 
+    private static function inflector(): Inflector
+    {
+        if (!isset(self::$inflector)) {
+            self::$inflector = InflectorFactory::create()->build();
+        }
+
+        return self::$inflector;
+    }
+
     /**
      * Checks whether a constant with this name is defined.
      */