diff --git a/2-application/build.gradle b/2-application/build.gradle
index d53d49c..5736043 100644
--- a/2-application/build.gradle
+++ b/2-application/build.gradle
@@ -5,7 +5,7 @@ import java.util.Properties
 plugins {
     id 'java'
     id 'jacoco'
-    id 'org.springframework.boot' version '3.5.16'
+    id 'org.springframework.boot' version '4.1.1'
     id 'io.spring.dependency-management' version '1.1.7'
 }
 
diff --git a/4-knowledge-graph/build.gradle b/4-knowledge-graph/build.gradle
index 255c6fb..b0b8e6d 100644
--- a/4-knowledge-graph/build.gradle
+++ b/4-knowledge-graph/build.gradle
@@ -1,6 +1,6 @@
 plugins {
     id 'java'
-    id 'org.springframework.boot' version '3.5.16'
+    id 'org.springframework.boot' version '4.1.1'
     id 'io.spring.dependency-management' version '1.1.7'
 }