diff --git a/conversational-ai4j-demo/build.gradle b/conversational-ai4j-demo/build.gradle
index 4cec422..94d16ef 100644
--- a/conversational-ai4j-demo/build.gradle
+++ b/conversational-ai4j-demo/build.gradle
@@ -1,6 +1,6 @@
 plugins {
   id 'java'
-  id 'org.springframework.boot' version '3.5.10'
+  id 'org.springframework.boot' version '4.0.2'
   id 'io.spring.dependency-management' version '1.1.7'
 }