diff --git a/Jenkinsfile b/Jenkinsfile
new file mode 100644
index 0000000..237dda4
--- /dev/null
+++ b/Jenkinsfile
@@ -0,0 +1,8 @@
+#!/usr/bin/groovy
+
+buildPlugin(failFast: false,
+            configurations: [
+                [platform: 'linux',   jdk: '17', jenkins: '2.346.1'],
+                [platform: 'linux',   jdk: '11'],
+                [platform: 'windows', jdk: '8'],
+            ])
diff --git a/pom.xml b/pom.xml
index 3841976..349e6d8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>2.5</version>
+    <version>4.47</version>
     <relativePath />
   </parent>
   <groupId>org.jvnet.hudson.tools</groupId>
@@ -14,17 +14,7 @@
   <packaging>hpi</packaging>
 
   <properties>
-    <!-- Baseline Jenkins version you use to build the plugin. Users must have this version or newer to run. -->
-    <jenkins.version>1.625.3</jenkins.version>
-    <!-- Java Level to use. Java 7 required when using core >= 1.612 -->
-    <java.level>7</java.level>
-    <!-- Jenkins Test Harness version you use to test the plugin. -->
-    <!-- For Jenkins version >= 1.580.1 use JTH 2.x or higher. -->
-    <jenkins-test-harness.version>2.1</jenkins-test-harness.version>
-    <!-- Other properties you may want to use:
-         ~ hpi-plugin.version: The HPI Maven Plugin version used by the plugin..
-         ~ stapler-plugin.version: The Stapler Maven plugin version required by the plugin.
-    -->
+     <jenkins.version>2.332.4</jenkins.version>
   </properties>
 
   <name>Version Number Plug-In</name>
@@ -89,32 +79,38 @@
     </pluginRepository>
   </pluginRepositories>
 
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>io.jenkins.tools.bom</groupId>
+        <artifactId>bom-2.332.x</artifactId>
+        <version>1607.va_c1576527071</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
   <!-- If you want to depend on other plugins: -->
   <dependencies>
     <dependency>
       <groupId>org.jenkins-ci.plugins.workflow</groupId>
       <artifactId>workflow-api</artifactId>
-      <version>1.15</version>
     </dependency>
     <!-- Testing scope -->
     <dependency>
       <groupId>org.jenkins-ci.plugins.workflow</groupId>
-      <artifactId>workflow-aggregator</artifactId>
-      <version>1.14</version>
+      <artifactId>workflow-cps</artifactId>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.jenkins-ci.plugins.workflow</groupId>
-      <artifactId>workflow-support</artifactId>
-      <version>1.14</version>
-      <classifier>tests</classifier>
+      <artifactId>workflow-job</artifactId>
       <scope>test</scope>
     </dependency>
-    <!-- Required by workflow-cps-global-lib (transitive of git-server) -->
     <dependency>
-      <groupId>org.jenkins-ci.modules</groupId>
-      <artifactId>sshd</artifactId>
-      <version>1.6</version>
+      <groupId>org.jenkins-ci.plugins.workflow</groupId>
+      <artifactId>workflow-basic-steps</artifactId>
       <scope>test</scope>
     </dependency>
   </dependencies>
diff --git a/src/main/java/org/jvnet/hudson/tools/versionnumber/VersionNumberCommon.java b/src/main/java/org/jvnet/hudson/tools/versionnumber/VersionNumberCommon.java
index 3cf6f39..bf7d548 100644
--- a/src/main/java/org/jvnet/hudson/tools/versionnumber/VersionNumberCommon.java
+++ b/src/main/java/org/jvnet/hudson/tools/versionnumber/VersionNumberCommon.java
@@ -180,7 +180,7 @@ public static String formatVersionNumber(String versionNumberFormatString,
                 else {
                     LOGGER.fine("Special case: A variable could not be resolved. (Does it resolve to itself?)" +
                                 " [var == " + expressionKey + "]");
-                    if (enVars != null) {
+
                         for (Map.Entry entry : enVars.entrySet()) {
                             if (entry.getKey().equals(expressionKey)) {
                                 // Check for variable which resolves to itself!
@@ -195,7 +195,7 @@ public static String formatVersionNumber(String versionNumberFormatString,
                                     replaceValue = selectSubstringOfReplaceValue(replaceValue, argumentString);
                                 }
                             }
-                        }
+
                     }
                 }
                 vnf = vnf.substring(0, blockStart) + replaceValue + vnf.substring(blockEnd, vnf.length());