diff --git a/pom.xml b/pom.xml
index 361875f..e51106c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -95,7 +95,7 @@
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.2.11</version>
+      <version>1.2.13</version>
     </dependency>
 
     <!-- unit test -->