diff --git a/composer.json b/composer.json
index 3d6d622..74c6c35 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
         "nikic/fast-route": "^1.3",
         "psr/container": "^2.0",
         "psr/http-factory": "^1.0",
-        "psr/http-message": "^1.0.1",
+        "psr/http-message": "^1.1|^2.0",
         "psr/http-server-handler": "^1.0.1",
         "psr/http-server-middleware": "^1.0.1",
         "opis/closure": "^3.6.3",