diff --git a/composer.json b/composer.json
index c1b8970..544726b 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
     "prefer-stable": true,
     "require": {
         "php": ">=8.0.0",
-        "murph/murph-core": "dev-master",
+        "murph/murph-core": "^1.13,>=1.13.0",
         "sabre/dav": "^4.3"
     },
     "require-dev": {