diff --git a/tests/test-client-generation/pom.xml b/tests/test-client-generation/pom.xml
index df7168f1..dbf97d03 100644
--- a/tests/test-client-generation/pom.xml
+++ b/tests/test-client-generation/pom.xml
@@ -26,7 +26,7 @@
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.5.20</version>
+      <version>1.5.21</version>
     </dependency>
 
     <dependency>