diff --git a/boost-web-programming/Part3/BE/guestbook/pom.xml b/boost-web-programming/Part3/BE/guestbook/pom.xml
index 8dd1b527..79a1415e 100644
--- a/boost-web-programming/Part3/BE/guestbook/pom.xml
+++ b/boost-web-programming/Part3/BE/guestbook/pom.xml
@@ -9,7 +9,7 @@
   <url>http://maven.apache.org</url>
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <spring.version>5.2.3.RELEASE</spring.version>
+    <spring.version>5.2.20.RELEASE</spring.version>
   </properties>
   
   <dependencies>