diff --git a/assertj-mail/pom.xml b/assertj-mail/pom.xml
index 34b9ea7..321391c 100644
--- a/assertj-mail/pom.xml
+++ b/assertj-mail/pom.xml
@@ -151,7 +151,7 @@
             <dependency>
               <groupId>com.puppycrawl.tools</groupId>
               <artifactId>checkstyle</artifactId>
-              <version>13.3.0</version>
+              <version>13.4.0</version>
             </dependency>
           </dependencies>
         </plugin>
diff --git a/pom.xml b/pom.xml
index 263f882..34c5ded 100644
--- a/pom.xml
+++ b/pom.xml
@@ -68,7 +68,7 @@
             <dependency>
               <groupId>com.puppycrawl.tools</groupId>
               <artifactId>checkstyle</artifactId>
-              <version>13.3.0</version>
+              <version>13.4.0</version>
             </dependency>
           </dependencies>
         </plugin>