diff --git a/composer.json b/composer.json
index a43a6b3..cd789b4 100644
--- a/composer.json
+++ b/composer.json
@@ -27,7 +27,7 @@
     },
     "require": {
         "php": ">=5.4.2",
-        "guzzlehttp/psr7": "^1.7|^2.0"
+        "guzzlehttp/psr7": "^2 || ^1.7"
     },
     "require-dev": {
         "phpunit/phpunit": "5.7.*",