diff --git a/composer.json b/composer.json
index e39decc..abe9c9d 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     "gitonomy/gitlib": "~1.0",
     "psr/log": "^1",
     "knplabs/github-api": "^2.0",
-    "php-http/guzzle6-adapter": "^1.2"
+    "php-http/guzzle6-adapter": "^1.1"
   },
   "require-dev": {
     "phpunit/phpunit": "4@stable"