diff --git a/settings.gradle.kts b/settings.gradle.kts
index 2c640cd..c2b99e0 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -67,7 +67,7 @@ dependencyResolutionManagement {
             // micronaut.security.version=5.3.1, micronaut.serialization.version=3.1.0) --
             // Micronaut 5 is the current major; there is no newer 4.x release to prefer over it.
             version("micronaut", "5.2.6")
-            version("micronaut-security", "5.3.2")
+            version("micronaut-security", "5.4.0")
             version("micronaut-serde", "3.2.4")
             // Test-only (phase 5a consolidation, part 2): micronaut-test-junit5 versions
             // independently of micronaut-core -- verified against Maven Central on 2026-08-09,