diff --git a/CHANGELOG.md b/CHANGELOG.md
index d971471..2e0df4f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@
 * refactor: remove `Countable` from minimal classes
 * refactor: rename `RestrictedCountStrategy` to `DisabledCountStrategy`
 * feat: `$offset` parameter type widening for `ArrayAccess` methods
+* fix(`DefaultKeyTransformer`): only convert `Stringable` to string for now.
+* feat: add `UuidKeyTransformer`
 
 ## 0.7.0
 
diff --git a/packages/collections-common/src/KeyTransformer/DefaultKeyTransformer.php b/packages/collections-common/src/KeyTransformer/DefaultKeyTransformer.php
index d103531..f05a16a 100644
--- a/packages/collections-common/src/KeyTransformer/DefaultKeyTransformer.php
+++ b/packages/collections-common/src/KeyTransformer/DefaultKeyTransformer.php
@@ -14,14 +14,13 @@
 namespace Rekalogika\Domain\Collections\Common\KeyTransformer;
 
 use Rekalogika\Contracts\Collections\Exception\NotFoundException;
-use Symfony\Component\Uid\AbstractUid;
 
 class DefaultKeyTransformer implements KeyTransformer
 {
     public static function transformToKey(mixed $key): int|string
     {
-        if ($key instanceof AbstractUid) {
-            return $key->toBinary();
+        if ($key instanceof \Stringable) {
+            return (string) $key;
         } elseif (!\is_string($key) && !\is_int($key)) {
             throw new NotFoundException();
         }
diff --git a/packages/collections-common/src/KeyTransformer/UuidKeyTransformer.php b/packages/collections-common/src/KeyTransformer/UuidKeyTransformer.php
new file mode 100644
index 0000000..a8fa69b
--- /dev/null
+++ b/packages/collections-common/src/KeyTransformer/UuidKeyTransformer.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of rekalogika/collections package.
+ *
+ * (c) Priyadi Iman Nurcahyo <https://rekalogika.dev>
+ *
+ * For the full copyright and license information, please view the LICENSE file
+ * that was distributed with this source code.
+ */
+
+namespace Rekalogika\Domain\Collections\Common\KeyTransformer;
+
+use Rekalogika\Contracts\Collections\Exception\NotFoundException;
+use Symfony\Component\Uid\AbstractUid;
+use Symfony\Component\Uid\Uuid;
+
+class UuidKeyTransformer implements KeyTransformer
+{
+    public static function transformToKey(mixed $key): int|string
+    {
+        if ($key instanceof AbstractUid) {
+            return $key->toRfc4122();
+        }
+
+        if (!\is_string($key)) {
+            throw new NotFoundException();
+        }
+
+        try {
+            $uuid = new Uuid($key);
+
+            return $key;
+        } catch (\InvalidArgumentException $e) {
+            throw new NotFoundException();
+        }
+    }
+}