diff --git a/Spring_Security/pom.xml b/Spring_Security/pom.xml
index d9648d9..309879d 100644
--- a/Spring_Security/pom.xml
+++ b/Spring_Security/pom.xml
@@ -75,7 +75,7 @@
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-core</artifactId>
-			<version>4.3.19.RELEASE</version>
+			<version>4.3.21.RELEASE</version>
 		</dependency>
 		
 		<!-- Spring 5 Web Dependency -->