diff --git a/pom.xml b/pom.xml
index 20c0868..c35a378 100644
--- a/pom.xml
+++ b/pom.xml
@@ -24,7 +24,7 @@
             </roles>
         </developer>
     </developers>
-    
+
     <dependencies>
         <dependency>
             <groupId>ch.qos.logback</groupId>
@@ -52,7 +52,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-javadoc-plugin</artifactId>
-                <version>2.9.1</version>
+                <version>${maven-javadoc-plugin.version}</version>
                 <executions>
                     <execution>
                         <id>attach-javadocs</id>
@@ -114,6 +114,8 @@
         <exec-maven-plugin.version>3.0.0</exec-maven-plugin.version>
         <maven-surefire-plugin.version>2.21.0</maven-surefire-plugin.version>
         <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
+        <maven-javadoc-plugin.version>2.9.1</maven-javadoc-plugin.version>
+
     </properties>
 
 </project>
\ No newline at end of file