diff --git a/pom.xml b/pom.xml
index 165c0e0..efa162b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -54,7 +54,7 @@
     <project.build.outputTimestamp>2026-06-29T17:27:40Z</project.build.outputTimestamp>
 
     <!-- build tool versions -->
-    <checkstyle.version>13.8.0</checkstyle.version>
+    <checkstyle.version>13.9.0</checkstyle.version>
     <maven-checkstyle-plugin.version>3.6.0</maven-checkstyle-plugin.version>
     <spotless-maven-plugin.version>3.8.0</spotless-maven-plugin.version>
     <templating-maven-plugin.version>3.1.0</templating-maven-plugin.version>