diff --git a/Jenkinsfile b/Jenkinsfile
index ec7f9a0ea..572b7dcec 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -84,6 +84,9 @@ stage('prep') {
 if (BRANCH_NAME == 'master' || fullTestMarkerFile || env.CHANGE_ID && pullRequest.labels.contains('full-test')) {
   branches = [failFast: false]
   lines.each {line ->
+    if (line != 'weekly') {
+      return
+    }
     pluginsByRepository.each { repository, plugins ->
       branches["pct-$repository-$line"] = {
         def jdk = line == 'weekly' ? 21 : 11
diff --git a/sample-plugin/pom.xml b/sample-plugin/pom.xml
index 4a05172b9..3331fbdf5 100644
--- a/sample-plugin/pom.xml
+++ b/sample-plugin/pom.xml
@@ -14,7 +14,8 @@
   <properties>
     <changelist>999999-SNAPSHOT</changelist>
     <bom>weekly</bom>
-    <jenkins.version>2.427</jenkins.version>
+    <!-- TODO https://github.com/jenkinsci/jenkins/pull/8608 -->
+    <jenkins.version>2.428-rc34312.02815a_a_6cdd5</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
   </properties>
   <dependencyManagement>