diff --git a/.circleci/config.yml b/.circleci/config.yml
index a1f9229b..80737742 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -61,7 +61,7 @@ jobs:
           at: .
       - run:
           name: Run tests in parallel
-          command: npx grunt execSpecsInParallel
+          command: npm run test:parallel
 
   test_browsers: &test_browsers
     executor: node18
diff --git a/.editorconfig b/.editorconfig
index 0ba33458..9f7c7232 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -3,6 +3,6 @@ charset = utf-8
 end_of_line = lf
 insert_final_newline = true
 
-[*.{js, mjs, json, sh, yml}]
+[*.{js,mjs,json,sh,yml}]
 indent_style = space
 indent_size = 2
diff --git a/Gruntfile.js b/Gruntfile.js
deleted file mode 100644
index 5554f3ab..00000000
--- a/Gruntfile.js
+++ /dev/null
@@ -1,248 +0,0 @@
-const fs = require('fs');
-const glob = require('glob');
-const ejs = require('ejs');
-const sass = require('sass');
-
-module.exports = function(grunt) {
-  var pkg = require("./package.json");
-  global.jasmineVersion = pkg.version;
-
-  grunt.initConfig({
-    pkg: pkg,
-    cssUrlEmbed: require('./grunt/config/cssUrlEmbed.js')
-  });
-
-  require('load-grunt-tasks')(grunt);
-
-  grunt.registerMultiTask('cssUrlEmbed', "Embed URLs as base64 strings inside your stylesheets", function () {
-    var done = this.async();
-
-    import('css-url-embed').then(cssEmbed => {
-      for (const file of this.files) {
-        try {
-          grunt.log.subhead('Processing source file "' + file.src[0] + '"');
-          const urls = cssEmbed.processFile(file.src[0], file.dest);
-
-          for (const url of urls) {
-            grunt.log.ok('"' + url + '" embedded');
-          }
-
-          grunt.log.writeln('File "' + file.dest + '" created');
-        } catch (e) {
-          grunt.log.error(e);
-          grunt.fail.warn('URL embedding failed\n');
-        }
-      }
-
-      done();
-    });
-  });
-
-  grunt.loadTasks('grunt/tasks');
-
-  grunt.registerTask('sass',
-    'Compile sass to css',
-    function() {
-      try {
-        const output = sass.compile('src/html/jasmine.scss');
-        fs.writeFileSync('lib/jasmine-core/jasmine.css', output.css,
-          {encoding: 'utf8'});
-      } catch (e) {
-        console.error(e);
-        throw e;
-      }
-    }
-  );
-
-  grunt.registerTask('default', ['sass', "cssUrlEmbed"]);
-
-  grunt.registerTask('concat',
-    'Concatenate files',
-    function() {
-      try {
-        const configs = [
-          {
-            src: [
-              'src/html/requireHtml.js',
-              'src/html/HtmlReporter.js',
-              'src/html/HtmlSpecFilter.js',
-              'src/html/ResultsNode.js',
-              'src/html/QueryString.js',
-              'src/html/**/*.js'
-            ],
-            dest: 'lib/jasmine-core/jasmine-html.js',
-          },
-          {
-            dest: 'lib/jasmine-core/jasmine.js',
-            src: [
-              'src/core/requireCore.js',
-              'src/core/matchers/requireMatchers.js',
-              'src/core/base.js',
-              'src/core/util.js',
-              'src/core/Spec.js',
-              'src/core/Order.js',
-              'src/core/Env.js',
-              'src/core/JsApiReporter.js',
-              'src/core/PrettyPrinter',
-              'src/core/Suite',
-              'src/core/**/*.js',
-              {
-                template: 'src/version.js',
-                data: {version: jasmineVersion}
-              },
-            ],
-          },
-          {
-            dest: 'lib/jasmine-core/boot0.js',
-            src: ['src/boot/boot0.js'],
-          },
-          {
-            dest: 'lib/jasmine-core/boot1.js',
-            src: ['src/boot/boot1.js'],
-          }
-        ];
-        const licenseBanner = {
-          template: 'grunt/templates/licenseBanner.js.ejs',
-          data: {currentYear: new Date(Date.now()).getFullYear()}
-        };
-
-        for (const {src, dest} of configs) {
-          src.unshift(licenseBanner);
-
-          function expand(srcListEntry) {
-            if (typeof srcListEntry === 'object') {
-              return srcListEntry;
-            }
-
-            return glob.sync(srcListEntry)
-              .sort(function (a, b) {
-                // Match the sort order of previous build tools, so that the
-                // output is the same.
-                a = a.toLowerCase();
-                b = b.toLowerCase();
-
-                if (a < b) {
-                  return -1;
-                } else if (a === b) {
-                  return 0;
-                } else {
-                  return 1;
-                }
-              });
-          }
-
-          const srcs = src.flatMap(expand);
-          const seen = new Set();
-          const chunks = [];
-
-          for (const s of srcs) {
-            let content;
-
-            if (!seen.has(s)) {
-              if (s.template) {
-                const template = fs.readFileSync(s.template, {encoding: 'utf8'});
-                content = ejs.render(template, s.data);
-              } else {
-                content = fs.readFileSync(s, {encoding: 'utf8'});
-              }
-
-              chunks.push(content);
-              seen.add(s);
-            }
-          }
-
-          fs.writeFileSync(dest, chunks.join('\n'), {encoding: 'utf8'});
-        }
-      } catch (e) {
-        console.error(e);
-        throw e;
-      }
-    }
-  );
-
-  grunt.registerTask('buildDistribution',
-    'Builds and lints jasmine.js, jasmine-html.js, jasmine.css',
-    [
-      'sass',
-      "cssUrlEmbed",
-      'concat'
-    ]
-  );
-
-  grunt.registerTask("execSpecsInNode",
-    "Run Jasmine core specs in Node.js",
-    function() {
-      verifyNoGlobals(() => require('./lib/jasmine-core.js').noGlobals());
-      const done = this.async(),
-        Jasmine = require('jasmine'),
-        jasmineCore = require('./lib/jasmine-core.js'),
-        jasmine = new Jasmine({jasmineCore: jasmineCore});
-
-      jasmine.loadConfigFile('./spec/support/jasmine.json');
-      jasmine.exitOnCompletion = false;
-      jasmine.execute().then(
-        result => done(result.overallStatus === 'passed'),
-        err => {
-          console.error(err);
-          done(false);
-        }
-      );
-    }
-  );
-
-  grunt.registerTask("execSpecsInParallel",
-    "Run Jasmine core specs in parallel in Node.js",
-    function() {
-      // Need to require this here rather than at the top of the file
-      // so that we don't break verifyNoGlobals above by loading jasmine-core
-      // too early
-      const ParallelRunner = require('jasmine/parallel');
-      let numWorkers = require('os').cpus().length;
-
-      if (process.env['CIRCLECI']) {
-        // On Circle CI, the above gives the number of CPU cores on the host
-        // computer, which is unrelated to the resources actually available
-        // to the container. 2 workers gives peak performance with our current
-        // configuration, but 4 might increase the odds of discovering any
-        // parallel-specific bugs.
-        numWorkers = 4;
-      }
-
-      const done = this.async();
-      const runner = new ParallelRunner({
-        jasmineCore: require('./lib/jasmine-core.js'),
-        numWorkers
-      });
-
-      runner.loadConfigFile('./spec/support/jasmine.json')
-        .then(() => {
-          runner.exitOnCompletion = false;
-          return runner.execute();
-        }).then(
-          jasmineDoneInfo => done(jasmineDoneInfo.overallStatus === 'passed'),
-          err => {
-            console.error(err);
-            done(false);
-          }
-        );
-    }
-  );
-
-  grunt.registerTask("execSpecsInNode:performance",
-    "Run Jasmine performance specs in Node.js",
-    function() {
-      require("shelljs").exec("node_modules/.bin/jasmine JASMINE_CONFIG_PATH=spec/support/jasmine-performance.json");
-    }
-  );
-};
-
-function verifyNoGlobals(fn) {
-  const initialGlobals = Object.keys(global);
-  fn();
-
-  const extras = Object.keys(global).filter(k => !initialGlobals.includes(k));
-
-  if (extras.length !== 0) {
-    throw new Error('Globals were unexpectedly created: ' + extras.join(', '));
-  }
-}
diff --git a/RELEASE.md b/RELEASE.md
index 049b3570..632a75ee 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -41,7 +41,7 @@ When ready to release - specs are all green and the stories are done:
 
 ### Build standalone distribution
 
-1. Build the standalone distribution with `grunt buildStandaloneDist`
+1. Build the standalone distribution with `npm run buildStandaloneDist`
 1. This will generate `dist/jasmine-standalone-<version>.zip`, which you will upload later (see "Finally" below).
 
 ### Release the core NPM module
diff --git a/grunt/config/cssUrlEmbed.js b/grunt/config/cssUrlEmbed.js
deleted file mode 100644
index e883ffb3..00000000
--- a/grunt/config/cssUrlEmbed.js
+++ /dev/null
@@ -1,7 +0,0 @@
-module.exports = {
-  encodeWithBaseDir: {
-    files: {
-      "lib/jasmine-core/jasmine.css": ["lib/jasmine-core/jasmine.css"]
-    }
-  }
-};
diff --git a/grunt/tasks/build_standalone.js b/grunt/tasks/build_standalone.js
deleted file mode 100644
index cb23618d..00000000
--- a/grunt/tasks/build_standalone.js
+++ /dev/null
@@ -1,105 +0,0 @@
-var grunt = require("grunt");
-const fs = require('fs');
-const path = require('path');
-const archiver = require('archiver');
-const glob = require('glob');
-const ejs = require('ejs');
-
-function standaloneTmpDir(path) {  return "dist/tmp/" + path; }
-
-grunt.registerTask("build:compileSpecRunner",
-    "Processes the spec runner template and writes to a tmp file",
-    function() {
-      const template = fs.readFileSync('grunt/templates/SpecRunner.html.ejs',
-        {encoding: 'utf8'});
-      const runnerHtml = ejs.render(template, { jasmineVersion: global.jasmineVersion });
-
-      if (!fs.existsSync('dist/tmp')) {
-        fs.mkdirSync('dist/tmp');
-      }
-
-      fs.writeFileSync('dist/tmp/SpecRunner.html', runnerHtml,
-        {encoding: 'utf8'});
-    }
-);
-
-grunt.registerTask("build:cleanSpecRunner",
-    "Deletes the tmp spec runner file",
-    function() {
-        grunt.file.delete(standaloneTmpDir(""));
-    }
-);
-
-const standaloneFileGroups = [
-    {
-        src: [
-            'LICENSE',
-            'dist/tmp/SpecRunner.html',
-        ]
-    },
-    {
-        src: [
-            'images/jasmine_favicon.png',
-            'lib/jasmine-core/jasmine.js',
-            'lib/jasmine-core/jasmine-html.js',
-            'lib/jasmine-core/jasmine.css',
-            'lib/jasmine-core/boot0.js',
-            'lib/jasmine-core/boot1.js',
-        ],
-        destDir: 'lib/jasmine-' + jasmineVersion
-    },
-    {
-        src: glob.sync('lib/jasmine-core/example/src/*.js'),
-        destDir: 'src'
-    },
-    {
-        src: glob.sync('lib/jasmine-core/example/spec/*.js'),
-        destDir: 'spec'
-    }
-];
-
-grunt.registerTask("zipStandaloneDist",
-    "Creates a zip file for the standalone distribution",
-    function() {
-        const done = this.async();
-        const destPath = `./dist/jasmine-standalone-${global.jasmineVersion}.zip`;
-        const output = fs.createWriteStream(destPath);
-        const archive = archiver('zip');
-
-        output.on('close', done);
-
-        archive.on('warning', function (err) {
-            grunt.fail.warn(err)
-        });
-
-        archive.on('error', function (err) {
-            grunt.fail.warn(err)
-        });
-
-        archive.pipe(output);
-
-        for (const group of standaloneFileGroups) {
-            for (const srcPath of group.src) {
-                let destPath = path.basename(srcPath);
-
-                if (group.destDir) {
-                    destPath = `${group.destDir}/${destPath}`;
-                }
-
-                archive.file(srcPath, {name: destPath});
-            }
-        }
-
-        archive.finalize();
-    }
-);
-
-grunt.registerTask("buildStandaloneDist",
-    "Builds a standalone distribution",
-    [
-      "buildDistribution",
-      "build:compileSpecRunner",
-      "zipStandaloneDist",
-      "build:cleanSpecRunner"
-    ]
-);
diff --git a/package.json b/package.json
index 72bb4db5..93b87683 100644
--- a/package.json
+++ b/package.json
@@ -15,9 +15,11 @@
   ],
   "scripts": {
     "posttest": "eslint \"src/**/*.js\" \"spec/**/*.js\" && prettier --check \"src/**/*.js\" \"spec/**/*.js\"",
-    "test": "grunt --stack execSpecsInNode",
+    "test": "node scripts/runSpecsInNode.js",
+    "test:parallel": "node scripts/runSpecsInParallel.js",
     "cleanup": "prettier --write \"src/**/*.js\" \"spec/**/*.js\"",
-    "build": "grunt buildDistribution",
+    "build": "node scripts/buildDistribution.js",
+    "buildStandaloneDist": "node scripts/buildStandaloneDist.js",
     "serve": "node spec/support/localJasmineBrowser.js",
     "serve:performance": "node spec/support/localJasmineBrowser.js jasmine-browser-performance.json",
     "ci": "node spec/support/ci.js",
@@ -43,12 +45,9 @@
     "eslint-plugin-compat": "^6.0.2",
     "glob": "^10.2.3",
     "globals": "^16.0.0",
-    "grunt": "^1.0.4",
-    "grunt-cli": "^1.3.2",
     "jasmine": "^5.0.0",
     "jasmine-browser-runner": "github:jasmine/jasmine-browser-runner",
     "jsdom": "^26.0.0",
-    "load-grunt-tasks": "^5.1.0",
     "prettier": "1.17.1",
     "rimraf": "^5.0.10",
     "sass": "^1.58.3",
diff --git a/scripts/buildDistribution.js b/scripts/buildDistribution.js
new file mode 100644
index 00000000..286e2549
--- /dev/null
+++ b/scripts/buildDistribution.js
@@ -0,0 +1,3 @@
+const buildDistribution = require('./lib/buildDistribution');
+
+buildDistribution();
diff --git a/scripts/buildStandaloneDist.js b/scripts/buildStandaloneDist.js
new file mode 100644
index 00000000..a1f255f6
--- /dev/null
+++ b/scripts/buildStandaloneDist.js
@@ -0,0 +1,89 @@
+const fs = require('fs');
+const path = require('path');
+const glob = require('glob');
+const ejs = require('ejs');
+const archiver = require('archiver');
+const { rimrafSync } = require('rimraf');
+const buildDistribution = require('./lib/buildDistribution');
+
+const tmpDir = 'dist/tmp'
+
+if (!fs.existsSync(tmpDir)) {
+  fs.mkdirSync(tmpDir);
+}
+
+buildStandaloneDist().finally(function() {
+  rimrafSync(tmpDir);
+});
+
+async function buildStandaloneDist() {
+  buildDistribution();
+  const pkg = JSON.parse(fs.readFileSync('package.json'));
+  compileSpecRunner(pkg.version);
+  await zipStandaloneDist(pkg.version);
+}
+
+function compileSpecRunner(jasmineVersion) {
+  const template = fs.readFileSync('src/SpecRunner.html.ejs',
+    {encoding: 'utf8'});
+  const runnerHtml = ejs.render(template, { jasmineVersion });
+  fs.writeFileSync('dist/tmp/SpecRunner.html', runnerHtml,
+    {encoding: 'utf8'});
+}
+
+async function zipStandaloneDist(jasmineVersion) {
+  const fileGroups = [
+    {
+      src: [
+        'LICENSE',
+        'dist/tmp/SpecRunner.html',
+      ]
+    },
+    {
+      src: [
+        'images/jasmine_favicon.png',
+        'lib/jasmine-core/jasmine.js',
+        'lib/jasmine-core/jasmine-html.js',
+        'lib/jasmine-core/jasmine.css',
+        'lib/jasmine-core/boot0.js',
+        'lib/jasmine-core/boot1.js',
+      ],
+      destDir: 'lib/jasmine-' + jasmineVersion
+    },
+    {
+      src: glob.sync('lib/jasmine-core/example/src/*.js'),
+      destDir: 'src'
+    },
+    {
+      src: glob.sync('lib/jasmine-core/example/spec/*.js'),
+      destDir: 'spec'
+    }
+  ];
+
+  const destPath = `./dist/jasmine-standalone-${jasmineVersion}.zip`;
+  const output = fs.createWriteStream(destPath);
+  const archive = archiver('zip');
+
+  const done = new Promise(function(resolve, reject) {
+    output.on('close', resolve);
+    archive.on('warning', reject);
+    archive.on('error', reject);
+  });
+
+  archive.pipe(output);
+
+  for (const group of fileGroups) {
+    for (const srcPath of group.src) {
+      let destPath = path.basename(srcPath);
+
+      if (group.destDir) {
+        destPath = `${group.destDir}/${destPath}`;
+      }
+
+      archive.file(srcPath, {name: destPath});
+    }
+  }
+
+  archive.finalize();
+  await done;
+}
diff --git a/scripts/lib/buildDistribution.js b/scripts/lib/buildDistribution.js
new file mode 100644
index 00000000..f92587ac
--- /dev/null
+++ b/scripts/lib/buildDistribution.js
@@ -0,0 +1,129 @@
+const fs = require('fs');
+const sass = require('sass');
+const glob = require('glob');
+const ejs = require('ejs');
+const cssUrlEmbed = require('css-url-embed');
+
+function buildDistribution() {
+  compileSass();
+  embedCssAssets();
+  concatFiles();
+}
+
+function embedCssAssets() {
+  const cssPath = 'lib/jasmine-core/jasmine.css';
+  cssUrlEmbed.processFile(cssPath, cssPath, function(filePath) {
+    if (filePath.endsWith('.png')) {
+      return 'image/png';
+    } else if (filePath.endsWith('.svg')) {
+      return 'image/svg+xml';
+    } else {
+      throw new Error(`Don't know MIME type for file: ${filePath}`);
+    }
+  });
+}
+
+function compileSass() {
+  const output = sass.compile('src/html/jasmine.scss');
+  fs.writeFileSync('lib/jasmine-core/jasmine.css', output.css,
+    {encoding: 'utf8'});
+}
+
+function concatFiles() {
+  const pkg = JSON.parse(fs.readFileSync('package.json'));
+  const configs = [
+    {
+      src: [
+        'src/html/requireHtml.js',
+        'src/html/HtmlReporter.js',
+        'src/html/HtmlSpecFilter.js',
+        'src/html/ResultsNode.js',
+        'src/html/QueryString.js',
+        'src/html/**/*.js'
+      ],
+      dest: 'lib/jasmine-core/jasmine-html.js',
+    },
+    {
+      dest: 'lib/jasmine-core/jasmine.js',
+      src: [
+        'src/core/requireCore.js',
+        'src/core/matchers/requireMatchers.js',
+        'src/core/base.js',
+        'src/core/util.js',
+        'src/core/Spec.js',
+        'src/core/Order.js',
+        'src/core/Env.js',
+        'src/core/JsApiReporter.js',
+        'src/core/PrettyPrinter',
+        'src/core/Suite',
+        'src/core/**/*.js',
+        {
+          template: 'src/version.js',
+          data: {version: pkg.version}
+        },
+      ],
+    },
+    {
+      dest: 'lib/jasmine-core/boot0.js',
+      src: ['src/boot/boot0.js'],
+    },
+    {
+      dest: 'lib/jasmine-core/boot1.js',
+      src: ['src/boot/boot1.js'],
+    }
+  ];
+  const licenseBanner = {
+    template: 'src/licenseBanner.js.ejs',
+    data: {currentYear: new Date(Date.now()).getFullYear()}
+  };
+
+  for (const {src, dest} of configs) {
+    src.unshift(licenseBanner);
+
+    function expand(srcListEntry) {
+      if (typeof srcListEntry === 'object') {
+        return srcListEntry;
+      }
+
+      return glob.sync(srcListEntry)
+        .sort(function (a, b) {
+          // Match the sort order of previous build tools, so that the
+          // output is the same.
+          a = a.toLowerCase();
+          b = b.toLowerCase();
+
+          if (a < b) {
+            return -1;
+          } else if (a === b) {
+            return 0;
+          } else {
+            return 1;
+          }
+        });
+    }
+
+    const srcs = src.flatMap(expand);
+    const seen = new Set();
+    const chunks = [];
+
+    for (const s of srcs) {
+      let content;
+
+      if (!seen.has(s)) {
+        if (s.template) {
+          const template = fs.readFileSync(s.template, {encoding: 'utf8'});
+          content = ejs.render(template, s.data);
+        } else {
+          content = fs.readFileSync(s, {encoding: 'utf8'});
+        }
+
+        chunks.push(content);
+        seen.add(s);
+      }
+    }
+
+    fs.writeFileSync(dest, chunks.join('\n'), {encoding: 'utf8'});
+  }
+}
+
+module.exports = buildDistribution;
diff --git a/scripts/runSpecsInNode.js b/scripts/runSpecsInNode.js
new file mode 100644
index 00000000..08e772f3
--- /dev/null
+++ b/scripts/runSpecsInNode.js
@@ -0,0 +1,28 @@
+verifyNoGlobals(() => require('../lib/jasmine-core.js').noGlobals());
+
+const Jasmine = require('jasmine');
+const jasmineCore = require('../lib/jasmine-core.js');
+const runner = new Jasmine({jasmineCore: jasmineCore});
+
+runner.loadConfigFile('./spec/support/jasmine.json');
+runner.exitOnCompletion = false;
+runner.execute()
+  .then(
+    result => result.overallStatus === 'passed',
+    err => {
+      console.error(err);
+      return false;
+    }
+  )
+  .then(ok => process.exit(ok ? 0 : 1));
+
+function verifyNoGlobals(fn) {
+  const initialGlobals = Object.keys(global);
+  fn();
+
+  const extras = Object.keys(global).filter(k => !initialGlobals.includes(k));
+
+  if (extras.length !== 0) {
+    throw new Error('Globals were unexpectedly created: ' + extras.join(', '));
+  }
+}
diff --git a/scripts/runSpecsInParallel.js b/scripts/runSpecsInParallel.js
new file mode 100644
index 00000000..9e15939b
--- /dev/null
+++ b/scripts/runSpecsInParallel.js
@@ -0,0 +1,28 @@
+const ParallelRunner = require('jasmine/parallel');
+const jasmineCore = require('../lib/jasmine-core.js');
+let numWorkers = require('os').cpus().length;
+
+if (process.env['CIRCLECI']) {
+  // On Circle CI, the above gives the number of CPU cores on the host
+  // computer, which is unrelated to the resources actually available
+  // to the container. 2 workers gives peak performance with our current
+  // configuration, but 4 might increase the odds of discovering any
+  // parallel-specific bugs.
+  numWorkers = 4;
+}
+
+const runner = new ParallelRunner({jasmineCore, numWorkers});
+
+runner.loadConfigFile('./spec/support/jasmine.json')
+  .then(() => {
+    runner.exitOnCompletion = false;
+    return runner.execute();
+  })
+  .then(
+    jasmineDoneInfo => jasmineDoneInfo.overallStatus === 'passed',
+    err => {
+      console.error(err);
+      return false;
+    }
+  )
+  .then(ok => process.exit(ok ? 0 : 1));
diff --git a/grunt/templates/SpecRunner.html.ejs b/src/SpecRunner.html.ejs
similarity index 100%
rename from grunt/templates/SpecRunner.html.ejs
rename to src/SpecRunner.html.ejs
diff --git a/grunt/templates/licenseBanner.js.ejs b/src/licenseBanner.js.ejs
similarity index 100%
rename from grunt/templates/licenseBanner.js.ejs
rename to src/licenseBanner.js.ejs