diff --git a/reactive/webflux/authentication/x509/build.gradle b/reactive/webflux/authentication/x509/build.gradle
index 46dc0e2..d1f8bfd 100644
--- a/reactive/webflux/authentication/x509/build.gradle
+++ b/reactive/webflux/authentication/x509/build.gradle
@@ -18,3 +18,7 @@ dependencies {
 	testImplementation 'org.springframework.security:spring-security-test'
 }
 
+
+tasks.withType(Test).configureEach {
+	useJUnitPlatform()
+}