diff --git a/composer.json b/composer.json
index 6ec6c0d..13402dd 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
         "behat/mink-extension": "^2.1",
         "silverstripe/mink-framework-web-driver": "^1",
         "symfony/dom-crawler": "^3",
-        "silverstripe/testsession": "^2",
+        "silverstripe/testsession": "^2.1",
         "silverstripe/framework": "^4",
         "symfony/finder": "^3.2"
     },