diff --git a/composer.json b/composer.json
old mode 100755
new mode 100644
index 9f0b0df..7ada343
--- a/composer.json
+++ b/composer.json
@@ -2,7 +2,7 @@
     "name": "php-middleware/request-simulator",
     "require": {
         "php": ">=5.6",
-        "zendframework/zend-diactoros": "^1.1",
+        "zendframework/zend-diactoros": "^2.1",
         "php-middleware/double-pass-compatibility": "^1.0",
         "http-interop/http-middleware": "^0.4.1",
         "psr/http-message": "^1.0"