diff --git a/servlet/spring-boot/java/authentication/username-password/user-details-service/custom-user/build.gradle b/servlet/spring-boot/java/authentication/username-password/user-details-service/custom-user/build.gradle
index a0aafdb..b859734 100644
--- a/servlet/spring-boot/java/authentication/username-password/user-details-service/custom-user/build.gradle
+++ b/servlet/spring-boot/java/authentication/username-password/user-details-service/custom-user/build.gradle
@@ -11,6 +11,8 @@ repositories {
 	maven { url "https://repo.spring.io/snapshot" }
 }
 
+ext["micrometer.version"] = "1.10.0-SNAPSHOT"
+
 dependencies {
 	implementation 'org.springframework.boot:spring-boot-starter-security'
 	implementation 'org.springframework.boot:spring-boot-starter-web'