diff --git a/composer.json b/composer.json
index 2eabc37..1adf616 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "psr/http-server-middleware": "^1.0",
         "psr/container": "^1.0",
         "psr/http-message": "^1.0.1",
-        "zendframework/zend-diactoros": "^1.1.3"
+        "zendframework/zend-diactoros": "^1.1.3 || ^2.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.1.2",