diff --git a/composer.json b/composer.json
index 1a4a12e..e051477 100644
--- a/composer.json
+++ b/composer.json
@@ -20,11 +20,11 @@
         }
     ],
     "require": {
-        "silverstripe/framework": "~3.1",
+        "silverstripe/framework": "^4.0@dev",
         "monolog/monolog": "~1.15"
     },
     "require-dev": {
-        "silverstripe/cms": "~3.1",
+        "silverstripe/cms": "^4.0@dev",
         "hafriedlander/silverstripe-phockito": "*"
     },
     "extra": {