diff --git a/composer.json b/composer.json
index 522d4322..be3fdf91 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
         "ext-mbstring": "*",
         "composer/ca-bundle": "^1.0",
         "oscarotero/html-parser": "^0.1.4",
-        "psr/http-message": "^1.0",
+        "psr/http-message": "^1.0|^2.0",
         "psr/http-client": "^1.0",
         "psr/http-factory": "^1.0",
         "ml/json-ld": "^1.1"