diff --git a/docs/tutorial/pom.xml b/docs/tutorial/pom.xml
index 55eb26c..485ae9e 100644
--- a/docs/tutorial/pom.xml
+++ b/docs/tutorial/pom.xml
@@ -18,7 +18,7 @@
   <packaging>takari-maven-plugin</packaging>
 
   <properties>
-    <mavenVersion>3.3.9</mavenVersion>
+    <mavenVersion>3.8.1</mavenVersion>
   </properties>
 
   <dependencies>