diff --git a/composer.json b/composer.json
index 3661d9e..8af0669 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         "psr/http-message": "^1.0"
     },
     "require-dev": {
-        "infection/infection": "^0.26",
+        "infection/infection": "^0.26 || ^0.27",
         "kriswallsmith/buzz": "^1.2",
         "nyholm/psr7": "^1.5",
         "phpspec/prophecy-phpunit": "^2.0",