diff --git a/CHANGELOG.md b/CHANGELOG.md
index 99bf645..760100f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+3.13.1
+======
+
+* (improvement) Make `StoryblokIdSlugMapper` mock-able.
+
+
 3.13.0
 ======
 
diff --git a/src/Api/Transformer/StoryblokIdSlugMapper.php b/src/Api/Transformer/StoryblokIdSlugMapper.php
index c630d3d..8425d7f 100644
--- a/src/Api/Transformer/StoryblokIdSlugMapper.php
+++ b/src/Api/Transformer/StoryblokIdSlugMapper.php
@@ -5,7 +5,10 @@
 use Symfony\Contracts\Service\ResetInterface;
 use Torr\Storyblok\Api\ContentApi;
 
-final class StoryblokIdSlugMapper implements ResetInterface
+/**
+ * @final
+ */
+class StoryblokIdSlugMapper implements ResetInterface
 {
 	/** @var array<string|int, string>|null */
 	private ?array $map = null;