diff --git a/composer.json b/composer.json
index a03d9fe..3be97ba 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
         "knplabs/github-api": "~1.3"
     },
     "require-dev": {
-        "graham-campbell/testbench": "dev-master"
+        "graham-campbell/testbench": "~2.0"
     },
     "autoload": {
         "psr-4": {