diff --git a/composer.json b/composer.json
index 62e1278..f3db560 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
     ],
     "require": {
         "php": "^8.3",
-        "dragonmantank/cron-expression": "^3",
+        "dragonmantank/cron-expression": "^3.4",
         "silverstripe/framework": "^6"
     },
     "require-dev": {