diff --git a/pom.xml b/pom.xml
index 95b92b1..3b15468 100644
--- a/pom.xml
+++ b/pom.xml
@@ -44,7 +44,7 @@
 
     <!-- Third-party dependencies. -->
     <org.junit.version>5.14.1</org.junit.version>
-    <ch.qos.logback.version>1.5.20</ch.qos.logback.version>
+    <ch.qos.logback.version>1.5.21</ch.qos.logback.version>
   </properties>
 
   <licenses>