diff --git a/composer.json b/composer.json
index 251038f..b67bb2d 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
     "license": "MIT",
     "require": {
         "php": ">=7.1.0",
-        "kitetail/zttp": "^0.3.0"
+        "kitetail/zttp": "^0.4.0"
     },
     "autoload": {
         "psr-4": {