diff --git a/composer.json b/composer.json
index b8394ef..9356e23 100644
--- a/composer.json
+++ b/composer.json
@@ -7,14 +7,14 @@
     "config": {
         "sort-packages": true,
         "platform": {
-            "php": "5.6.3"
+            "php": "7.1.3"
         }
     },
     "support": {
         "issues": "https://github.com/Icinga/icinga-php-thirdparty/issues"
     },
     "require": {
-        "php": ">=5.6.3",
+        "php": ">=7.1.3",
         "ext-curl": "*",
         "clue/block-react": "^1",
         "clue/connection-manager-extra": "^1",
@@ -40,7 +40,8 @@
         "react/socket": "^1",
         "react/stream": "^1",
         "guzzlehttp/psr7": "^1",
-        "guzzlehttp/guzzle": "^6.5"
+        "guzzlehttp/guzzle": "^6.5",
+        "jfcherng/php-diff": "^6.10"
     },
     "require-dev": {
     }