diff --git a/ssrf-guard-springai-demo/build.gradle.kts b/ssrf-guard-springai-demo/build.gradle.kts
index 83f12bf..3dea464 100644
--- a/ssrf-guard-springai-demo/build.gradle.kts
+++ b/ssrf-guard-springai-demo/build.gradle.kts
@@ -1,6 +1,6 @@
 plugins {
     java
-    id("org.springframework.boot") version "3.5.3"
+    id("org.springframework.boot") version "4.0.6"
     id("io.spring.dependency-management") version "1.1.6"
 }