diff --git a/composer.json b/composer.json
index 7cf59c3..2e42aa2 100644
--- a/composer.json
+++ b/composer.json
@@ -39,7 +39,7 @@
         "fig/http-message-util": "^1.1.2",
         "psr/container": "^1.0 || ^2.0",
         "psr/http-factory": "^1.0",
-        "psr/http-message": "^1.0.1",
+        "psr/http-message": "^1.0.1 || ^2.0.0",
         "psr/http-server-middleware": "^1.0",
         "webmozart/assert": "^1.10"
     },
diff --git a/composer.lock b/composer.lock
index ef98a39..4f33986 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "0b5246607f3de246835403a5017e54db",
+    "content-hash": "f4d6bad9ff06870409c010abb0b41f5a",
     "packages": [
         {
             "name": "fig/http-message-util",