diff --git a/composer.json b/composer.json
index b62c0559..87d865d7 100644
--- a/composer.json
+++ b/composer.json
@@ -48,6 +48,6 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^8.5 || ^7.5",
-        "smarty/smarty-lexer": "dev-master"
+        "smarty/smarty-lexer": "^4.0.2"
     }
 }