diff --git a/README.md b/README.md
index cf460790..2f208dae 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 Java bytecode engineering toolkit
 ### [Javassist version 3](http://www.javassist.org)
 
-Copyright (C) 1999-2020 by Shigeru Chiba, All rights reserved.
+Copyright (C) 1999-2021 by Shigeru Chiba, All rights reserved.
 
 Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation
 simple. It is a class library for editing bytecodes in Java; it enables Java
diff --git a/Readme.html b/Readme.html
index 1bd4b416..58da8128 100644
--- a/Readme.html
+++ b/Readme.html
@@ -7,7 +7,7 @@
 
 <h1>Javassist version 3</h1>
 
-<h3>Copyright (C) 1999-2020 by Shigeru Chiba, All rights reserved.</h3>
+<h3>Copyright (C) 1999-2021 by Shigeru Chiba, All rights reserved.</h3>
 
 <p><br></p>
 
@@ -291,7 +291,7 @@ <h2>Release</h2>
 
 <h2>Changes</h2>
 
-<p>-version 3.28
+<p>-version 3.28 on May 8, 2021
 <ul>
    <li>GitHub Issue #305, #328, #339, #350, #357, and PR #363.
 </ul>
diff --git a/build.xml b/build.xml
index 4fd45c6e..8e77bfc3 100644
--- a/build.xml
+++ b/build.xml
@@ -6,7 +6,7 @@
 
 <project name="javassist" default="jar" basedir=".">
 
-  <property name="dist-version" value="javassist-3.27.0-GA"/>
+  <property name="dist-version" value="javassist-3.28.0-GA"/>
 
   <property environment="env"/>
   <property name="target.jar" value="javassist.jar"/>
diff --git a/pom.xml b/pom.xml
index 2f97e6c0..3fe94575 100644
--- a/pom.xml
+++ b/pom.xml
@@ -7,7 +7,7 @@
   	Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation
     simple.  It is a class library for editing bytecodes in Java.
   </description>
-  <version>3.27.0-GA</version>
+  <version>3.28.0-GA</version>
   <name>Javassist</name>
   <url>http://www.javassist.org/</url>
 
diff --git a/src/main/javassist/CtClass.java b/src/main/javassist/CtClass.java
index dc3bd2ea..f528673d 100644
--- a/src/main/javassist/CtClass.java
+++ b/src/main/javassist/CtClass.java
@@ -80,7 +80,7 @@ public abstract class CtClass {
      */
     public static void main(String[] args) {
         System.out.println("Javassist version " + CtClass.version);
-        System.out.println("Copyright (C) 1999-2020 Shigeru Chiba."
+        System.out.println("Copyright (C) 1999-2021 Shigeru Chiba."
                            + " All Rights Reserved.");
     }