diff --git a/build.gradle b/build.gradle
index 6886405..df8fdf5 100644
--- a/build.gradle
+++ b/build.gradle
@@ -39,8 +39,9 @@ repositories {
 
 dependencies {
     // DigitalSanctuary Spring User Framework
-    // 5.3.3 adds the WebAuthn step-up primitive (SUF-02, library #365) this demo exercises.
-    implementation 'com.digitalsanctuary:ds-spring-user-framework:5.3.3'
+    // 5.3.4 aligns the passkey enrollment freshness denial to HTTP 401 + step-up-required (library #371),
+    // which this demo's webauthn-register.js and step-up E2E exercise; 5.3.3 added the step-up primitive.
+    implementation 'com.digitalsanctuary:ds-spring-user-framework:5.3.4'
 
     // WebAuthn support (Passkey authentication)
     implementation 'org.springframework.security:spring-security-webauthn'