diff --git a/composer.json b/composer.json
index 9a9adc3b..3ab2438e 100644
--- a/composer.json
+++ b/composer.json
@@ -48,7 +48,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^8.5 || ^7.5",
-        "smarty/smarty-lexer": "^4.0.1"
+        "smarty/smarty-lexer": "dev-master"
     },
     "repositories": [
         {