diff --git a/src/main/groovy/org/jenkinsci/gradle/plugins/jpi/JpiExtension.groovy b/src/main/groovy/org/jenkinsci/gradle/plugins/jpi/JpiExtension.groovy
index 8b7f9bce..aaec48b3 100644
--- a/src/main/groovy/org/jenkinsci/gradle/plugins/jpi/JpiExtension.groovy
+++ b/src/main/groovy/org/jenkinsci/gradle/plugins/jpi/JpiExtension.groovy
@@ -146,7 +146,7 @@ class JpiExtension {
         }
 
         if (new VersionNumber(this.coreVersion) >= new VersionNumber('2.64')) {
-            testHarnessVersion = '2.31'
+            testHarnessVersion = '2.60'
         }
 
         // workarounds for JENKINS-26331
diff --git a/src/test/groovy/org/jenkinsci/gradle/plugins/jpi/JpiExtensionSpec.groovy b/src/test/groovy/org/jenkinsci/gradle/plugins/jpi/JpiExtensionSpec.groovy
index 6e229f37..91400cc7 100644
--- a/src/test/groovy/org/jenkinsci/gradle/plugins/jpi/JpiExtensionSpec.groovy
+++ b/src/test/groovy/org/jenkinsci/gradle/plugins/jpi/JpiExtensionSpec.groovy
@@ -343,7 +343,7 @@ class JpiExtensionSpec extends Specification {
 
         then:
         def dependencies = collectDependencies(project, 'jenkinsTest')
-        'org.jenkins-ci.main:jenkins-test-harness:2.31' in dependencies
+        'org.jenkins-ci.main:jenkins-test-harness:2.60' in dependencies
         'org.jenkins-ci.main:ui-samples-plugin:2.0' in dependencies
         project.configurations.jenkinsWar in project.configurations.jenkinsTest.extendsFrom
     }