diff --git a/composer.json b/composer.json
index 539c798..f5cac16 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     ],
     "require": {
       "php": ">=5.4",
-      "caffeina-core/core": "~1",
+      "caffeina-core/core": "*",
       "erusev/parsedown-extra": "*"
     },
     "minimum-stability": "stable",