diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4f30242c3..8e7c614f9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,7 +38,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        node: [10, 12, 14, 16, 19]
+        node: [10, 12, 14, 16, 20]
     runs-on: ${{ matrix.os }}
     steps:
      - uses: actions/checkout@v2
diff --git a/package-lock.json b/package-lock.json
index c1ca16a13..b0d4eb3a2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,8 +12,7 @@
       "devDependencies": {
         "github-changes": "^1.1.2",
         "lerna": "^3.22.1",
-        "npm-run-all": "^4.1.5",
-        "resolve-bin": "~1.0.1"
+        "npm-run-all": "^4.1.5"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -4441,11 +4440,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/find-parent-dir": {
-      "version": "0.3.1",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/find-up": {
       "version": "4.1.0",
       "dev": true,
@@ -9033,14 +9027,6 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/resolve-bin": {
-      "version": "1.0.1",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "find-parent-dir": "~0.3.0"
-      }
-    },
     "node_modules/resolve-cwd": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/resolve-cwd/-/resolve-cwd-2.0.0.tgz",
@@ -14659,10 +14645,6 @@
       "integrity": "sha512-8rXg1ZnX7xzy2NGDVkBVaAy+lSlPNwad13BtgSlLuxfIslyt5Vg64U7tFcCt4WS1R0hvtnQybT/IyCkGZ3DpXQ==",
       "dev": true
     },
-    "find-parent-dir": {
-      "version": "0.3.1",
-      "dev": true
-    },
     "find-up": {
       "version": "4.1.0",
       "dev": true,
@@ -18203,13 +18185,6 @@
         "path-parse": "^1.0.6"
       }
     },
-    "resolve-bin": {
-      "version": "1.0.1",
-      "dev": true,
-      "requires": {
-        "find-parent-dir": "~0.3.0"
-      }
-    },
     "resolve-cwd": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/resolve-cwd/-/resolve-cwd-2.0.0.tgz",
diff --git a/package.json b/package.json
index 61fce01dd..9758bb590 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,6 @@
   "devDependencies": {
     "github-changes": "^1.1.2",
     "lerna": "^3.22.1",
-    "npm-run-all": "^4.1.5",
-    "resolve-bin": "~1.0.1"
+    "npm-run-all": "^4.1.5"
   }
 }
diff --git a/packages/less/Gruntfile.js b/packages/less/Gruntfile.js
index 65e400fc4..b0731c887 100644
--- a/packages/less/Gruntfile.js
+++ b/packages/less/Gruntfile.js
@@ -2,7 +2,6 @@
 
 var resolve = require('resolve');
 var path = require('path');
-var resolveBin = require('resolve-bin')
 
 var testFolder = path.relative(process.cwd(), path.dirname(resolve.sync('@less/test-data')));
 var lessFolder = path.join(testFolder, 'less');
@@ -184,12 +183,6 @@ module.exports = function(grunt) {
     // Make the SauceLabs jobs
     ["all"].concat(browserTests).map(makeJob);
 
-    var path = require('path');
-
-    // Handle async / await in Rollup build for tests
-    const tsNodeRuntime = resolveBin.sync('ts-node');
-    const crossEnv = resolveBin.sync('cross-env');
-
     // Project configuration.
     grunt.initConfig({
         shell: {
@@ -223,12 +216,7 @@ module.exports = function(grunt) {
                 command: "node build/rollup.js --browser --out=./tmp/browser/less.min.js"
             },
             test: {
-                command: [
-                    // https://github.com/TypeStrong/ts-node/issues/693#issuecomment-848907036
-                    crossEnv + " TS_NODE_SCOPE=true",
-                    tsNodeRuntime + " test/test-es6.ts",
-                    "node test/index.js"
-                ].join(' && ')
+                command: 'ts-node test/test-es6.ts && node test/index.js'
             },
             generatebrowser: {
                 command: 'node test/browser/generator/generate.js'
diff --git a/packages/less/test/browser/generator/runner.config.js b/packages/less/test/browser/generator/runner.config.js
index a47bf7341..6298e0ad8 100644
--- a/packages/less/test/browser/generator/runner.config.js
+++ b/packages/less/test/browser/generator/runner.config.js
@@ -1,11 +1,11 @@
 var path = require('path');
 var resolve = require('resolve')
+var { forceCovertToBrowserPath } = require('./utils');
 
 /** Root of repo */
-var rootFolder = path.resolve(__dirname, '../../../../../');
-var testFolder = path.dirname(resolve.sync('@less/test-data'))
-var lessFolder = path.join(testFolder, 'less');
-var localTests = path.resolve(__dirname, '..');
+var testFolder = forceCovertToBrowserPath(path.dirname(resolve.sync('@less/test-data')));
+var lessFolder = forceCovertToBrowserPath(path.join(testFolder, 'less'));
+var localTests = forceCovertToBrowserPath(path.resolve(__dirname, '..'));
 
 module.exports = {
     main: {
@@ -35,7 +35,7 @@ module.exports = {
         }
     },
     strictUnits: {
-        src: [`${lessFolder}/strict-units/*.less`],
+        src: [`${lessFolder}/units/strict/*.less`],
         options: {
             helpers: 'test/browser/runner-strict-units-options.js',
             specs: 'test/browser/runner-strict-units-spec.js',
@@ -185,4 +185,4 @@ module.exports = {
             outfile: 'tmp/browser/test-runner-filemanager-plugin.html'
         }
     }
-}
\ No newline at end of file
+}
diff --git a/packages/less/test/browser/generator/template.js b/packages/less/test/browser/generator/template.js
index 7341114e5..77c5a896e 100644
--- a/packages/less/test/browser/generator/template.js
+++ b/packages/less/test/browser/generator/template.js
@@ -1,10 +1,11 @@
 const html = require('html-template-tag')
 const path = require('path')
+const { forceCovertToBrowserPath } = require('./utils')
 
 const webRoot = path.resolve(__dirname, '../../../../../');
-const mochaDir = path.relative(webRoot, path.dirname(require.resolve('mocha')))
-const chaiDir = path.relative(webRoot, path.dirname(require.resolve('chai')))
-const mochaTeamCityDir = path.relative(webRoot, path.dirname(require.resolve('mocha-teamcity-reporter')))
+const mochaDir = forceCovertToBrowserPath(path.relative(webRoot, path.dirname(require.resolve('mocha'))))
+const chaiDir = forceCovertToBrowserPath(path.relative(webRoot, path.dirname(require.resolve('chai'))))
+const mochaTeamCityDir = forceCovertToBrowserPath(path.relative(webRoot, path.dirname(require.resolve('mocha-teamcity-reporter'))))
 
 /**
  * Generates HTML templates from list of test sheets
diff --git a/packages/less/test/browser/generator/utils.js b/packages/less/test/browser/generator/utils.js
new file mode 100644
index 000000000..a2041f1f2
--- /dev/null
+++ b/packages/less/test/browser/generator/utils.js
@@ -0,0 +1,14 @@
+/**
+ * utils for covert browser paths,
+ * fix https://github.com/less/less.js/pull/4213 
+ * 
+ * @param {string} path 
+ * @returns {string}
+ */
+function forceCovertToBrowserPath (path) {
+    return (path || '').replace(/\\/g, '/');
+}
+
+module.exports = {
+    forceCovertToBrowserPath
+}