diff --git a/composer.json b/composer.json
index 926f2f0..ffeabb1 100644
--- a/composer.json
+++ b/composer.json
@@ -11,18 +11,18 @@
     "license": "MIT",
 
     "require": {
-        "php": "^5.5.9 || ^7.0"
+        "php": "^5.5.9 || ^7.1"
     },
 
     "require-dev": {
         "phpunit/phpunit": "~5.0",
         "mockery/mockery": "dev-master",
-        "doctrine/cache": "^1.6",
-        "symfony/cache": "~3.0",
-        "symfony/dependency-injection": "~2.8|~3.0",
-        "symfony/http-kernel": "~2.8|~3.0",
-        "illuminate/contracts": "^5.4",
-        "illuminate/cache": "^5.4"
+        "doctrine/cache": "^1.7",
+        "symfony/cache": "~4.1",
+        "symfony/dependency-injection": "~2.8|~3.0|~4.1",
+        "symfony/http-kernel": "~2.8|~3.0|~4.1",
+        "illuminate/contracts": "^5.6",
+        "illuminate/cache": "^5.6"
     },
 
     "suggest": {