diff --git a/composer.json b/composer.json
index 19fa87a..faa61e7 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
         "php": ">=5.3.0",
         "ext-curl": "*",
         "ext-json": "*",
-        "psr/log": "1.0.0"
+        "psr/log": "^1.0.0"
     },
     "require-dev": {
         "phpunit/phpunit": "3.7.*"