diff --git a/SpMVC_04_Iolist/pom.xml b/SpMVC_04_Iolist/pom.xml
index 05182f4..7380032 100644
--- a/SpMVC_04_Iolist/pom.xml
+++ b/SpMVC_04_Iolist/pom.xml
@@ -10,7 +10,7 @@
 	<version>1.0.0-BUILD-SNAPSHOT</version>
 	<properties>
 		<java-version>1.8</java-version>
-		<org.springframework-version>5.1.11.RELEASE</org.springframework-version>
+		<org.springframework-version>5.2.20.RELEASE</org.springframework-version>
 		<org.aspectj-version>1.6.10</org.aspectj-version>
 		<org.slf4j-version>1.6.6</org.slf4j-version>
 	</properties>