diff --git a/composer.json b/composer.json
index 2e0cccb..6fffb96 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
     "behat/mink-extension": "^2.1",
     "behat/mink-selenium2-driver": "^1.3",
     "symfony/dom-crawler": "^3",
-    "silverstripe/testsession": "~2.0.0@alpha",
+    "silverstripe/testsession": "^2.0.0@alpha",
     "silverstripe/framework": "^4@dev",
     "symfony/finder": "^3.2"
   },