diff --git a/Jenkinsfile b/Jenkinsfile
index 34a625c..1be0a79 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -4,6 +4,6 @@
  * allowing one to test against multiple Jenkins versions.
  */
 buildPlugin(useContainerAgent: true, configurations: [
-  [ platform: 'windows', jdk: '17' ],
-  [ platform: 'linux', jdk: '21' ]
+  [ platform: 'linux', jdk: 25 ],
+  [ platform: 'windows', jdk: 21 ]
 ])
diff --git a/pom.xml b/pom.xml
index 6da1903..d3f87fb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
   <parent>
     <groupId>org.jenkins-ci</groupId>
     <artifactId>jenkins</artifactId>
-    <version>1.142</version>
+    <version>2.1326.v00b_e26755312</version>
     <relativePath />
   </parent>
 
diff --git a/src/main/java/io/jenkins/lib/versionnumber/JavaSpecificationVersion.java b/src/main/java/io/jenkins/lib/versionnumber/JavaSpecificationVersion.java
index 5017407..3b4feab 100644
--- a/src/main/java/io/jenkins/lib/versionnumber/JavaSpecificationVersion.java
+++ b/src/main/java/io/jenkins/lib/versionnumber/JavaSpecificationVersion.java
@@ -75,6 +75,11 @@ public class JavaSpecificationVersion extends VersionNumber {
         releaseToClass.put(18, 62);
         releaseToClass.put(19, 63);
         releaseToClass.put(20, 64);
+        releaseToClass.put(21, 65);
+        releaseToClass.put(22, 66);
+        releaseToClass.put(23, 67);
+        releaseToClass.put(24, 68);
+        releaseToClass.put(25, 69);
         RELEASE_TO_CLASS = Collections.unmodifiableNavigableMap(releaseToClass);
 
         NavigableMap<Integer, Integer> classToRelease = new TreeMap<>();
diff --git a/src/test/java/io/jenkins/lib/versionnumber/JavaSpecificationVersionTest.java b/src/test/java/io/jenkins/lib/versionnumber/JavaSpecificationVersionTest.java
index 09d4166..2eedc1c 100644
--- a/src/test/java/io/jenkins/lib/versionnumber/JavaSpecificationVersionTest.java
+++ b/src/test/java/io/jenkins/lib/versionnumber/JavaSpecificationVersionTest.java
@@ -79,6 +79,12 @@ void shouldRetrieveSpecVersionForTheCurrentJVM() {
         assertNotNull(JavaSpecificationVersion.forCurrentJVM());
     }
 
+    @Test
+    void shouldRetrieveClassVersionForTheCurrentJVM() {
+        // Library no longer supports Java versions before 21
+        assertTrue(JavaSpecificationVersion.forCurrentJVM().toClassVersion() >= 21);
+    }
+
     @Test
     void invalidVersions() {
         assertThrows(NumberFormatException.class, () -> new JavaSpecificationVersion("1.1.1"));