diff --git a/composer.json b/composer.json
index e73d61cf..056f3a01 100644
--- a/composer.json
+++ b/composer.json
@@ -18,8 +18,8 @@
     "php": ">=5.5",
     "justinrainbow/json-schema": "^1.6 || ^2.0 || ^4.0 || ^5.0",
     "lastguest/murmurhash": "1.3.0",
-    "guzzlehttp/guzzle": "~6.2",
-    "monolog/monolog": "~1.21"
+    "guzzlehttp/guzzle": ">=6.2",
+    "monolog/monolog": ">=1.21"
   },
   "require-dev": {
     "phpunit/phpunit": "^4.8|^5.0",