diff --git a/composer.json b/composer.json
index 052defe..872443e 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
         }
     },
     "require": {
-        "psr/http-message": "^1.0"
+        "psr/http-message": "^2.0"
     },
     "extra": {
         "lean": {