diff --git a/composer.json b/composer.json
index 2e8bbe6..f9f2489 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
         "ext-openssl": "*",
         "ext-pdo": "*",
 
-        "simplesamlphp/assert": "~1.9",
+        "simplesamlphp/assert": "~2.0",
         "simplesamlphp/simplesamlphp": "~2.5@RC",
         "spomky-labs/cbor-php": "~3.2",
         "spomky-labs/pki-framework": "~1.4",