diff --git a/composer.json b/composer.json
index 2d17281..c198e0c 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,7 @@
         "ext-json": "*",
         "psr/log": "^1|^2|^3",
         "psr/http-client": "^1.0",
-        "psr/http-message": "^1.0",
+        "psr/http-message": "^1.0 || ^2.0",
         "psr/http-message-implementation": "^1.0",
         "php-http/client-implementation": "^1.0",
         "php-http/message-factory": "^1.0",