diff --git a/pom.xml b/pom.xml
index de5a591..19398fc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -27,7 +27,7 @@
     <pmd-plugin.version>3.28.0</pmd-plugin.version>
     <pmd.version>7.26.0</pmd.version>
     <checkstyle-plugin.version>3.6.0</checkstyle-plugin.version>
-    <checkstyle.version>13.8.0</checkstyle.version>
+    <checkstyle.version>13.9.0</checkstyle.version>
 
     <!-- SonarCloud setup -->
     <sonar.projectKey>SvenWoltmann_binary-tree</sonar.projectKey>