diff --git a/pom.xml b/pom.xml
index 4e5e65c..e7f7d8c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -55,7 +55,7 @@
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-core</artifactId>
-            <version>4.3.0.RELEASE</version>
+            <version>4.3.21.RELEASE</version>
         </dependency>
         <dependency>
             <groupId>org.mongodb</groupId>