diff --git a/composer.json b/composer.json
index 0207ae4..c3e60b6 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
     "nette/utils": "^2.0|^3.0|^4.0"
   },
   "require-dev": {
-    "guzzlehttp/guzzle": "^6.3|^7.0",
+    "guzzlehttp/guzzle": "^7.15.2",
     "nette/tester": "^2.4"
   }
 }