diff --git a/pom.xml b/pom.xml
index f2926cf..ac08aeb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -79,10 +79,10 @@
 
 		<!-- plugins -->
 
-		<version.org.apache.maven.plugins.checkstyle>3.2.2</version.org.apache.maven.plugins.checkstyle>
+		<version.org.apache.maven.plugins.checkstyle>3.3.0</version.org.apache.maven.plugins.checkstyle>
 		<version.org.apache.maven.plugins.clean>3.2.0</version.org.apache.maven.plugins.clean>
 		<version.org.apache.maven.plugins.compiler>3.11.0</version.org.apache.maven.plugins.compiler>
-		<version.org.apache.maven.plugins.dependency>3.5.0</version.org.apache.maven.plugins.dependency>
+		<version.org.apache.maven.plugins.dependency>3.6.0</version.org.apache.maven.plugins.dependency>
 		<version.org.apache.maven.plugins.deploy>3.1.1</version.org.apache.maven.plugins.deploy>
 		<version.org.apache.maven.plugins.gpg>3.1.0</version.org.apache.maven.plugins.gpg>
 		<version.org.apache.maven.plugins.install>3.1.1</version.org.apache.maven.plugins.install>
@@ -91,11 +91,11 @@
 		<version.org.apache.maven.plugins.jar>3.3.0</version.org.apache.maven.plugins.jar>
 		<version.org.apache.maven.plugins.release>3.0.0</version.org.apache.maven.plugins.release>
 		<version.org.apache.maven.plugins.resources>3.3.1</version.org.apache.maven.plugins.resources>
-		<version.org.apache.maven.plugins.source>3.2.1</version.org.apache.maven.plugins.source>
+		<version.org.apache.maven.plugins.source>3.3.0</version.org.apache.maven.plugins.source>
 		<version.org.apache.maven.plugins.surefire>3.1.0</version.org.apache.maven.plugins.surefire>
 		<version.org.codehaus.mojo.tidy>1.2.0</version.org.codehaus.mojo.tidy>
 		<version.org.sonatype.plugins.nexus-staging>1.6.13</version.org.sonatype.plugins.nexus-staging>
-		<version.com.puppycrawl.tools.checkstyle>10.11.0</version.com.puppycrawl.tools.checkstyle>
+		<version.com.puppycrawl.tools.checkstyle>10.12.0</version.com.puppycrawl.tools.checkstyle>
 		<version.io.kokuwa.checkstyle>0.5.6</version.io.kokuwa.checkstyle>
 
 		<!-- dependencies -->