diff --git a/gdf.js b/gdf.js
index c87229c..409d219 100755
--- a/gdf.js
+++ b/gdf.js
@@ -447,15 +447,15 @@ export class GDF {
 
     if (this.#pj.engines?.node) {
       // determine minimal version from package.json
-      let { node } = this.#pj.engines
-      let minversion = node.match(/\d+(\.\d+(\.\d+)?)?/)?.[0].split('.')
-      if (node.includes('>') && !node.includes("=")) {
+      const { node } = this.#pj.engines
+      const minversion = node.match(/\d+(\.\d+(\.\d+)?)?/)?.[0].split('.')
+      if (node.includes('>') && !node.includes('=')) {
         minversion.push(parseInt(minversion.pop()) + 1)
       }
 
       // ensure version is at least the minimum
       version = version.split('.')
-      for (const i=0; i<version.length; i++) {
+      for (let i = 0; i < version.length; i++) {
         if (minversion[i] > version[i]) {
           version = minversion
           break
diff --git a/test/test.js b/test/test.js
index c070f7a..559df36 100644
--- a/test/test.js
+++ b/test/test.js
@@ -30,7 +30,7 @@ for (const group of fs.readdirSync('test', { withFileTypes: true })) {
         await new GDF().run(workdir, options)
 
         let argmask = /^(ARG\s+\w+\s*=).*?(\s*\\?)$/gm
-        if (entry.name == 'version') argmask = /()xxx()/g
+        if (entry.name === 'version') argmask = /()xxx()/g
 
         const actualResults = fs.readFileSync(path.join(workdir, 'Dockerfile'), 'utf-8')
           .replaceAll(argmask, '$1xxx$2')