Oddities with PHPUnit versions

composer.json

@@ -25,7 +25,7 @@
     },
     "require-dev": {
 		"rncryptor/spec": "3.0.1",
-		"phpunit/phpunit": ">=4.8"
+		"phpunit/phpunit": "~4.8"
     },
     "autoload": {
         "psr-0": {"RNCryptor": "lib/"}