diff --git a/samples/boot/oauth2-integration/authorizationserver/spring-security-samples-boot-oauth2-integrated-authorizationserver.gradle b/samples/boot/oauth2-integration/authorizationserver/spring-security-samples-boot-oauth2-integrated-authorizationserver.gradle
index b53da68..2d0bd26 100644
--- a/samples/boot/oauth2-integration/authorizationserver/spring-security-samples-boot-oauth2-integrated-authorizationserver.gradle
+++ b/samples/boot/oauth2-integration/authorizationserver/spring-security-samples-boot-oauth2-integrated-authorizationserver.gradle
@@ -1,3 +1,5 @@
+ext['spring-security.version'] = '5.5.+' // TODO remove once Spring Boot upgraded to Spring Security 5.5
+
 apply plugin: 'io.spring.convention.spring-sample-boot'
 
 dependencies {