diff --git a/contentgrid-appserver-platform/build.gradle b/contentgrid-appserver-platform/build.gradle
index 4651da775..397ef325a 100644
--- a/contentgrid-appserver-platform/build.gradle
+++ b/contentgrid-appserver-platform/build.gradle
@@ -8,7 +8,7 @@ javaPlatform {
 }
 
 dependencies {
-    api platform('org.springframework.boot:spring-boot-dependencies:3.5.11')
+    api platform('org.springframework.boot:spring-boot-dependencies:4.0.3')
     api platform('com.contentgrid.thunx:thunx-bom:0.15.0')
 
     constraints {
diff --git a/settings.gradle b/settings.gradle
index 7b91ccccb..3879a6f53 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1,7 +1,7 @@
 pluginManagement {
     plugins {
         id "io.freefair.lombok" version "9.2.0"
-        id 'org.springframework.boot' version '3.5.11'
+        id 'org.springframework.boot' version '4.0.3'
     }
 }