diff --git a/build.gradle b/build.gradle
index 136b009d..ab79301f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,7 +10,7 @@ plugins {
   id 'application'
   id 'jacoco'
   id 'io.spring.dependency-management' version '1.1.7'
-  id 'org.springframework.boot' version '3.5.11'
+  id 'org.springframework.boot' version '4.0.5'
   id 'com.github.ben-manes.versions' version '0.53.0'
   id 'org.sonarqube' version '7.2.3.7755'
   id 'uk.gov.hmcts.java' version '0.12.67'