diff --git a/composer.json b/composer.json
index ee87ce0..e68ea81 100644
--- a/composer.json
+++ b/composer.json
@@ -13,10 +13,10 @@
         "php": ">= 5.5.9",
         "vierbergenlars/php-semver": "3.0.*",
         "desarrolla2/cache": "2.1.*",
-        "monolog/monolog": "1.18.*"
+        "monolog/monolog": "1.21.*"
     },
     "require-dev": {
-        "phpunit/phpunit": "4.5.*"
+        "phpunit/phpunit": "4.8.*"
     },
     "autoload": {
         "psr-4": {