diff --git a/build.gradle b/build.gradle
index 6f4cdbe1..fda6edd2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,7 @@ buildscript {
 		snapshotBuild = version.endsWith('SNAPSHOT')
 		milestoneBuild = !(releaseBuild || snapshotBuild)
 
-		springBootVersion = '2.4.5'
+		springBootVersion = '2.5.3'
 	}
 
 	repositories {
diff --git a/spring-session-samples/spring-session-sample-boot-websocket/src/main/resources/application.properties b/spring-session-samples/spring-session-sample-boot-websocket/src/main/resources/application.properties
index bfdecd49..62c01000 100644
--- a/spring-session-samples/spring-session-sample-boot-websocket/src/main/resources/application.properties
+++ b/spring-session-samples/spring-session-sample-boot-websocket/src/main/resources/application.properties
@@ -1,2 +1,3 @@
 #server.servlet.session.timeout=1m
 spring.h2.console.enabled=true
+spring.jpa.defer-datasource-initialization=true