diff --git a/composer.json b/composer.json
index fa3184b..02305aa 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,7 @@
   "type": "library",
   "require": {
     "php": "^7.2|^8.0",
-    "guzzlehttp/guzzle": "^6.3|^7.0",
+    "guzzlehttp/guzzle": "^6.3|^7.0|^8.0",
     "promphp/prometheus_client_php": "^1.0|^2.0"
   },
   "require-dev": {