diff --git a/composer.json b/composer.json
index e07500f..8774fa3 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         "ext-openssl": "*",
         "ext-pdo": "*",
 
-        "simplesamlphp/assert": "^1.9",
+        "simplesamlphp/assert": "^2.0",
         "simplesamlphp/simplesamlphp": "^2.5@dev"
     },
     "require-dev": {