diff --git a/Bookworm/pom.xml b/Bookworm/pom.xml
index f22b27a..ba2c7e0 100644
--- a/Bookworm/pom.xml
+++ b/Bookworm/pom.xml
@@ -36,7 +36,7 @@
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-core</artifactId>
-			<version>4.2.5.RELEASE</version>
+			<version>4.3.21.RELEASE</version>
 		</dependency>
 
 		<!-- http://mvnrepository.com/artifact/org.springframework/spring-web -->