diff --git a/composer.json b/composer.json
index d189d43..c97eb16 100644
--- a/composer.json
+++ b/composer.json
@@ -24,14 +24,15 @@
     }
   ],
   "require": {
+    "php": "~7.0.0 || ~7.1.0",
     "typo3/cms": "^7.6.0"
   },
   "require-dev": {
-    "namelesscoder/typo3-repository-client": "^1.2",
-    "nimut/testing-framework": "^1.0",
-    "mikey179/vfsStream": "^1.4",
+    "namelesscoder/typo3-repository-client": "^1.2.0",
+    "nimut/testing-framework": "^1.0.0",
     "typo3-ter/phpunit": "*",
-    "phpunit/phpunit": "^4.7 || ^5.0"
+    "phpunit/phpunit": "^5.7.0",
+    "mikey179/vfsStream": "^1.6.0"
   },
   "config": {
     "vendor-dir": ".Build/vendor",