diff --git a/sample-1-2/pom.xml b/sample-1-2/pom.xml
index 0a9909b..d8de2b9 100644
--- a/sample-1-2/pom.xml
+++ b/sample-1-2/pom.xml
@@ -31,7 +31,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>2.17</version>
+                <version>3.1.1</version>
                 <dependencies>
                     <dependency>
                         <groupId>com.puppycrawl.tools</groupId>
diff --git a/sample-2-1/pom.xml b/sample-2-1/pom.xml
index f2c5587..b643cd3 100644
--- a/sample-2-1/pom.xml
+++ b/sample-2-1/pom.xml
@@ -48,7 +48,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>2.17</version>
+                <version>3.1.1</version>
                 <dependencies>
                     <dependency>
                         <groupId>com.puppycrawl.tools</groupId>
diff --git a/sample-3-1/pom.xml b/sample-3-1/pom.xml
index eaefd18..9c99e53 100644
--- a/sample-3-1/pom.xml
+++ b/sample-3-1/pom.xml
@@ -79,7 +79,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
-                <version>3.0.0</version>
+                <version>3.1.1</version>
                 <dependencies>
                     <dependency>
                         <groupId>com.puppycrawl.tools</groupId>
diff --git a/sample-3-2/pom.xml b/sample-3-2/pom.xml
index ba8fafa..41cf0e3 100644
--- a/sample-3-2/pom.xml
+++ b/sample-3-2/pom.xml
@@ -56,7 +56,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-checkstyle-plugin</artifactId>
-				<version>3.0.0</version>
+				<version>3.1.1</version>
 				<dependencies>
 					<dependency>
 						<groupId>com.puppycrawl.tools</groupId>