diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 7fbe635..e3f143a 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -5,17 +5,17 @@ on:
     - cron: '0 15 * * *' # daily at 3pm
 jobs:
   build-and-test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     name: Build Application
     steps:
       - name: Checkout Code
         uses: actions/checkout@v3
 
-      - name: Setup for JDK 17
+      - name: Setup for JDK 21
         uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
           java-package: jdk
           cache: maven
 
diff --git a/.java-version b/.java-version
index 03b6389..5f39e91 100644
--- a/.java-version
+++ b/.java-version
@@ -1 +1 @@
-17.0
+21.0
diff --git a/README.md b/README.md
index 7cd7f20..90ecde1 100644
--- a/README.md
+++ b/README.md
@@ -2,8 +2,8 @@
 
 # About the Primer
 
-[![](https://img.shields.io/badge/Spring%20Boot%20Version-3.1.0-orange)](/pom.xml)
-[![](https://img.shields.io/badge/Java%20Version-17-orange)](/pom.xml)
+[![](https://img.shields.io/badge/Spring%20Boot%20Version-3.2.1-orange)](/pom.xml)
+[![](https://img.shields.io/badge/Java%20Version-21-orange)](/pom.xml)
 [![](https://img.shields.io/badge/Enroll-Now-orange)](https://rieckpil.de/testing-spring-boot-applications-primer/)
 
 `main` branch: [![Build & Test Maven Project (main)](https://github.com/rieckpil/testing-spring-boot-applications-primer/workflows/Build%20&%20Test%20Maven%20Project/badge.svg)](https://github.com/rieckpil/testing-spring-boot-applications-primer/actions/workflows/maven.yml?query=branch%3Amain)
@@ -40,13 +40,13 @@ Enroll [here](https://rieckpil.de/testing-spring-boot-applications-primer/) for
 
 Mandatory requirements:
 
-* Java 17 (JDK flavour (OpenJDK/Azul/Oracle) does not matter). For the correct Java version setup I can recommend [JEnv](https://www.youtube.com/watch?v=9FVZyeFDXo0) (Mac/Linux) and the [Maven Toolchains Plugin](https://maven.apache.org/plugins/maven-toolchains-plugin/toolchains/jdk.html) (Windows)
+* Java 21 (JDK flavour (OpenJDK/Azul/Oracle) does not matter). For the correct Java version setup I can recommend [JEnv](https://www.youtube.com/watch?v=9FVZyeFDXo0) (Mac/Linux) and the [Maven Toolchains Plugin](https://maven.apache.org/plugins/maven-toolchains-plugin/toolchains/jdk.html) (Windows)
 
 ```
 $ java -version
-openjdk version "17" 2021-09-14 LTS
-OpenJDK Runtime Environment Zulu17.28+13-CA (build 17+35-LTS)
-OpenJDK 64-Bit Server VM Zulu17.28+13-CA (build 17+35-LTS, mixed mode, sharing)
+openjdk version "21.0.2" 2024-01-16 LTS
+OpenJDK Runtime Environment Temurin-21.0.2+13 (build 21.0.2+13-LTS)
+OpenJDK 64-Bit Server VM Temurin-21.0.2+13 (build 21.0.2+13-LTS, mixed mode)
 ```
 
 * Docker Engine (Community Edition is enough):
diff --git a/pom.xml b/pom.xml
index e5f3905..ef8ead6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>3.1.1</version>
+    <version>3.2.1</version>
     <relativePath/> <!-- lookup parent from repository -->
   </parent>
 
@@ -16,7 +16,7 @@
   <name>spring-boot-testing-primer</name>
 
   <properties>
-    <java.version>17</java.version>
+    <java.version>21</java.version>
     <testcontainers.version>1.18.3</testcontainers.version>
     <selenium.version>4.8.3</selenium.version>
     <selenide.version>6.16.0</selenide.version>