diff --git a/pom.xml b/pom.xml
index 7da9317..c03ca1f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -140,7 +140,7 @@
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-core</artifactId>
-            <version>4.3.4.RELEASE</version>
+            <version>4.3.21.RELEASE</version>
         </dependency>
         <!-- spring end -->
         <dependency>