diff --git a/Jenkinsfile b/Jenkinsfile
index 99e7a01..9dc9a63 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -17,8 +17,8 @@ devToolsProject.run(
     data['venv'] = pyenv.createVirtualEnv(readFile('.python-version'))
     data.venv.run('pip install -r requirements-dev.txt')
 
-    data['groovy3Version'] = '3.0.10'
-    data['groovy4Version'] = '4.0.2'
+    data['groovy3Version'] = '3.0.22'
+    data['groovy4Version'] = '4.0.22'
 
     [data.groovy3Version, data.groovy4Version].each { groovyVersion ->
       String groovyZip = "apache-groovy-binary-${groovyVersion}.zip"
diff --git a/README.md b/README.md
index 5f6a5e8..9e9f1ca 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,8 @@ This repository provides a way to run [CodeNarc][codenarc-home] checks from a do
 image. CodeNarc analyzes Groovy code for defects, bad practices, inconsistencies, style
 issues and more.
 
-CodeNarc, and Groovylint by extension, require Groovy 3.0 or greater.
+CodeNarc, and Groovylint by extension, require Groovy 3.0.22 or greater (or Groovy 4.0.11
+or greater, if using Groovy 4.x).
 
 ## Usage
 
@@ -48,7 +49,6 @@ $ docker run --rm -v `pwd`:/ws -u `id -u`:`id -g` abletonag/groovylint \
     /opt/run_codenarc.py --single-file Jenkinsfile
 ```
 
-
 ### Running in a Docker container
 
 ```bash
diff --git a/VERSION b/VERSION
index 226468e..a551051 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.14.6
+0.15.0
diff --git a/ruleset.groovy b/ruleset.groovy
index b602754..a93d495 100644
--- a/ruleset.groovy
+++ b/ruleset.groovy
@@ -30,6 +30,7 @@ ruleset {
   ruleset('rulesets/generic.xml') {}
   ruleset('rulesets/groovyism.xml') {}
   ruleset('rulesets/imports.xml') {}
+  ruleset('rulesets/jenkins.xml') {}
   ruleset('rulesets/naming.xml') {
     FactoryMethodName(enabled: false)
     VariableName(ignoreVariableNames: '_')