diff --git a/core/pom.xml b/core/pom.xml
index a941dba6b..ba378ee3b 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -168,7 +168,7 @@
       <dependency>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-classic</artifactId>
-        <version>1.5.20</version>
+        <version>1.5.21</version>
         <scope>test</scope>
       </dependency>
       <dependency>