diff --git a/composer.json b/composer.json
index a52b1bd..1dc50c2 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
     "type": "robo-tasks",
     "require": {
         "php": ">=5.5.0",
-        "consolidation/robo": "^1.0"
+        "consolidation/robo": "^1.0 || ^2.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.5"