diff --git a/complete/build.gradle b/complete/build.gradle
index ca715c2..7dcaa6e 100644
--- a/complete/build.gradle
+++ b/complete/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-	id 'org.springframework.boot' version '3.5.7'
+	id 'org.springframework.boot' version '4.0.0'
 	id 'io.spring.dependency-management' version '1.1.7'
 	id 'java'
 }
diff --git a/initial/build.gradle b/initial/build.gradle
index ca715c2..7dcaa6e 100644
--- a/initial/build.gradle
+++ b/initial/build.gradle
@@ -1,5 +1,5 @@
 plugins {
-	id 'org.springframework.boot' version '3.5.7'
+	id 'org.springframework.boot' version '4.0.0'
 	id 'io.spring.dependency-management' version '1.1.7'
 	id 'java'
 }