diff --git a/composer.json b/composer.json
index 7e1d1c0..86433ee 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "silverstripe/framework": "^4.3"
+        "silverstripe/framework": "^4.0"
     },
     "extra": {
         "installer-name": "betternavigator",