diff --git a/composer.json b/composer.json
index 53d27a2..9175037 100644
--- a/composer.json
+++ b/composer.json
@@ -61,7 +61,7 @@
   },
   "require-dev": {
     "squizlabs/php_codesniffer": "3.*",
-    "wikimedia/less.php": "^3.1"
+    "wikimedia/less.php": "^5.0"
   },
   "scripts": {
     "post-install-cmd": [