diff --git a/guestbook/pom.xml b/guestbook/pom.xml
index 4bdb476..e5079e6 100644
--- a/guestbook/pom.xml
+++ b/guestbook/pom.xml
@@ -18,7 +18,7 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<maven.compiler.source>1.7</maven.compiler.source>
 		<maven.compiler.target>1.7</maven.compiler.target>
-		<spring.version>5.2.3.RELEASE</spring.version>
+		<spring.version>5.3.18</spring.version>
 		<!-- jackson -->
 		<jackson2.version>[2.9.10.1,)</jackson2.version>
 	</properties>