diff --git a/composer.json b/composer.json
index b217cbf..c9ec5a8 100644
--- a/composer.json
+++ b/composer.json
@@ -12,11 +12,11 @@
     }],
     "require": {
         "php": ">=5.3.0",
-        "psr/log": "~1.0",
-        "symfony/var-dumper": "~2.6"
+        "psr/log": "^1.0",
+        "symfony/var-dumper": "^2.6|^3.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.0"
+        "phpunit/phpunit": "^4.0|^5.0"
     },
     "autoload": {
         "psr-0": {"DebugBar": "src/"}