diff --git a/sandbox/pom.xml b/sandbox/pom.xml
index f0f4c1c..5064e6c 100644
--- a/sandbox/pom.xml
+++ b/sandbox/pom.xml
@@ -87,7 +87,7 @@
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-core</artifactId>
-            <version>4.3.13.RELEASE</version>
+            <version>4.3.21.RELEASE</version>
         </dependency>
 
         <dependency>