diff --git a/composer.json b/composer.json
index dffbe2f..d48535e 100644
--- a/composer.json
+++ b/composer.json
@@ -45,7 +45,7 @@
         "symfony/http-foundation": "~7.4"
     },
     "require-dev": {
-        "beste/clock": "~3.0",
+        "beste/clock": "~4.0",
         "mockery/mockery": "~1.6",
         "simplesamlphp/simplesamlphp-test-framework": "~1.11"
     },