diff --git a/.circleci/config.yml b/.circleci/config.yml
index ff01bb4..8ce2096 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -6,7 +6,7 @@ version: 2
 jobs:
   build:
     docker:
-      - image: maven:3.9.4-eclipse-temurin-17
+      - image: maven:3.9.9-eclipse-temurin-21
 
     working_directory: ~/repo
 
diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
new file mode 100644
index 0000000..1a6afc6
--- /dev/null
+++ b/.github/workflows/maven.yml
@@ -0,0 +1,35 @@
+# This workflow will build a Java project with Maven, and cache/restore any dependencies to improve the workflow execution time
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-java-with-maven
+
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up JDK 21
+      uses: actions/setup-java@v4
+      with:
+        java-version: '21'
+        distribution: 'temurin'
+        cache: maven
+    - name: Build with Maven
+      run: mvn -B package --file pom.xml
+
+    # Optional: Uploads the full dependency graph to GitHub to improve the quality of Dependabot alerts this repository can receive
+    - name: Update dependency graph
+      uses: advanced-security/maven-dependency-submission-action@571e99aab1055c2e71a1e2309b9691de18d6b7d6
diff --git a/README.md b/README.md
index ad56116..1602873 100644
--- a/README.md
+++ b/README.md
@@ -10,16 +10,19 @@ This library provides the ability to register Jersey resources to the admin port
 
 Supported versions:
 
-| Dropwizard  |  Admin resource |
-|---|---|
-| 1.1.0  | 1.1.0  |
-| 1.1.4  | 1.1.4  |
-| 1.2.2  | 1.2.2  |
-| 1.3.8  | 1.3.8  |
-| 2.0.0  | 2.0.0  |
-| 2.0.9  | 2.0.9  |
-| 4.0.1  | 4.0.1  |
-| 4.0.5  | 4.0.5  |
+| Dropwizard  |  Admin resource | Java version |
+|---|---| --- |
+| 1.1.0  | 1.1.0  | |
+| 1.1.4  | 1.1.4  | |
+| 1.2.2  | 1.2.2  | |
+| 1.3.8  | 1.3.8  | |
+| 2.0.0  | 2.0.0  | |
+| 2.0.9  | 2.0.9  | |
+| 4.0.1  | 4.0.1  | 11 |
+| 4.0.5  | 4.0.5  | 11 |
+| 4.0.11  | 4.0.11  | 21 |
+
+* Starting from version 4.0.11 this library is compiled with java 21.
 
 ## Maven
 
@@ -30,7 +33,7 @@ The library is available at the maven central, so just add dependency to `pom.xm
   <dependency>
     <groupId>com.github.mtakaki</groupId>
     <artifactId>dropwizard-admin-resource</artifactId>
-    <version>4.0.5</version>
+    <version>4.0.11</version>
   </dependency>
 </dependencies>
 ```
diff --git a/pom.xml b/pom.xml
index f717f7d..1a4cdc3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
 
     <groupId>com.github.mtakaki</groupId>
     <artifactId>dropwizard-admin-resource</artifactId>
-    <version>4.0.6-SNAPSHOT</version>
+    <version>4.0.11-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>Dropwizard Admin Resource</name>
@@ -21,7 +21,7 @@
     <developers>
         <developer>
             <name>Mitsuo Takaki</name>
-            <email>mitsuotakaki@gmail.com</email>
+            <email>g6rtfcy9i@mozmail.com</email>
             <organization>mtakaki</organization>
             <organizationUrl>https://github.com/mtakaki/</organizationUrl>
         </developer>
@@ -29,9 +29,8 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven.compiler.source>11</maven.compiler.source>
-        <maven.compiler.target>11</maven.compiler.target>
-        <dropwizard.version>4.0.5</dropwizard.version>
+        <maven.compiler.release>21</maven.compiler.release>
+        <dropwizard.version>4.0.11</dropwizard.version>
         <!-- Flaky test setting, re-run more 2 times in case of a failure -->
         <surefire.rerunFailingTestsCount>2</surefire.rerunFailingTestsCount>
     </properties>