diff --git a/pom.xml b/pom.xml
index 40b691e..511d9c6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -85,14 +85,14 @@
 
 		<!-- plugins -->
 
-		<version.org.apache.maven.plugins.checkstyle>3.1.2</version.org.apache.maven.plugins.checkstyle>
+		<version.org.apache.maven.plugins.checkstyle>3.2.0</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>3.10.1</version.org.apache.maven.plugins.compiler>
 		<version.org.apache.maven.plugins.dependency_>3.3.0</version.org.apache.maven.plugins.dependency_>
 		<version.org.apache.maven.plugins.deploy>3.0.0</version.org.apache.maven.plugins.deploy>
 		<version.org.apache.maven.plugins.gpg>3.0.1</version.org.apache.maven.plugins.gpg>
 		<version.org.apache.maven.plugins.install>3.0.1</version.org.apache.maven.plugins.install>
-		<version.org.apache.maven.plugins.javadoc>3.4.0</version.org.apache.maven.plugins.javadoc>
+		<version.org.apache.maven.plugins.javadoc>3.4.1</version.org.apache.maven.plugins.javadoc>
 		<version.org.apache.maven.plugins.jar>3.2.2</version.org.apache.maven.plugins.jar>
 		<version.org.apache.maven.plugins.release>3.0.0-M6</version.org.apache.maven.plugins.release>
 		<version.org.apache.maven.plugins.resources>3.3.0</version.org.apache.maven.plugins.resources>
@@ -100,7 +100,7 @@
 		<version.org.apache.maven.plugins.surefire>3.0.0-M7</version.org.apache.maven.plugins.surefire>
 		<version.org.codehaus.mojo.tidy>1.1.0</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>10.3.2</version.com.puppycrawl.tools.checkstyle>
+		<version.com.puppycrawl.tools.checkstyle>10.3.3</version.com.puppycrawl.tools.checkstyle>
 		<version.io.kokuwa.checkstyle>0.5.6</version.io.kokuwa.checkstyle>
 
 		<!-- dependencies -->