diff --git a/Jenkinsfile b/Jenkinsfile
index 4f7c280..e790162 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -4,6 +4,6 @@
  * allowing one to test against multiple Jenkins versions.
  */
 buildPlugin(useContainerAgent: true, configurations: [
-  [ platform: 'windows', jdk: '21' ],
+  [ platform: 'windows', jdk: '17' ],
   [ platform: 'linux', jdk: '25' ]
 ])
diff --git a/pom.xml b/pom.xml
index 68e4cc0..33245b9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,6 +26,7 @@
     <gitHubRepo>jenkinsci/lib-${project.artifactId}</gitHubRepo>
     <spotless.check.skip>false</spotless.check.skip>
     <ban-junit4-imports.skip>false</ban-junit4-imports.skip>
+    <maven.compiler.release>17</maven.compiler.release>
   </properties>
 
   <dependencies>