diff --git a/pom.xml b/pom.xml
index 4ddda8e..bad256f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -154,7 +154,7 @@
       <dependency>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-classic</artifactId>
-        <version>1.5.20</version>
+        <version>1.5.21</version>
       </dependency>
 
       <!-- Test suite -->