diff --git a/composer.json b/composer.json
index c10f721..7f1fda4 100644
--- a/composer.json
+++ b/composer.json
@@ -26,6 +26,7 @@
         "ext-json": "*",
         "cboden/ratchet": "^0.4.1",
         "clue/buzz-react": "^2.5",
+        "guzzlehttp/psr7": "^1.5",
         "illuminate/broadcasting": "5.7.*",
         "illuminate/console": "5.7.*",
         "illuminate/http": "5.7.*",