diff --git a/pom.xml b/pom.xml
index 4e6af95..2617329 100644
--- a/pom.xml
+++ b/pom.xml
@@ -71,7 +71,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
-            <version>1.5.20</version>
+            <version>1.5.21</version>
             <scope>test</scope>
         </dependency>
     </dependencies>