diff --git a/src/Psalm/Internal/PluginManager/ComposerLock.php b/src/Psalm/Internal/PluginManager/ComposerLock.php
index 03c9733d9..428b914aa 100644
--- a/src/Psalm/Internal/PluginManager/ComposerLock.php
+++ b/src/Psalm/Internal/PluginManager/ComposerLock.php
@@ -18,7 +18,7 @@ use function json_last_error_msg;
 /**
  * @internal
  */
-final class ComposerLock
+class ComposerLock
 {
     /** @var string[] */
     private array $file_names;