diff --git a/composer.json b/composer.json
index 4c019c0..a9f8d2c 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
         "composer/composer": "^2.1",
         "firehed/input": "^2.1.5",
         "psr/container": "^1.0 || ^2.0",
-        "psr/http-message": "^1.0",
+        "psr/http-message": "^2.0",
         "psr/http-server-handler": "^1.0",
         "psr/http-server-middleware": "^1.0",
         "psr/log": "^1.0",