diff --git a/package.json b/package.json
index 66b3ab94f..4c3d66b5c 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "repository": "https://github.com/gruntjs/grunt.git",
   "license": "MIT",
   "engines": {
-    "node": ">=10"
+    "node": ">=8"
   },
   "scripts": {
     "test": "node bin/grunt test",
diff --git a/test/fixtures/spawn-multibyte.js b/test/fixtures/spawn-multibyte.js
index 8277711f6..b592341c6 100644
--- a/test/fixtures/spawn-multibyte.js
+++ b/test/fixtures/spawn-multibyte.js
@@ -4,7 +4,7 @@
 // A multibyte buffer containing all our output. We will slice it later.
 // In this case we are using a Japanese word for hello / good day, where each
 // character takes three bytes.
-var fullOutput = new Buffer('こんにちは');
+var fullOutput = Buffer.from('こんにちは');
 
 // Output one full character and one third of a character
 process.stdout.write(fullOutput.slice(0, 4));
diff --git a/test/grunt/config_test.js b/test/grunt/config_test.js
index 6da5422e2..e2db6cf12 100644
--- a/test/grunt/config_test.js
+++ b/test/grunt/config_test.js
@@ -18,7 +18,7 @@ exports.config = {
       bar: 'bar',
       arr: ['foo', '<%= obj.foo2 %>'],
       arr2: ['<%= arr %>', '<%= obj.Arr %>'],
-      buffer: new Buffer('test'),
+      buffer: Buffer.from('test'),
     });
     done();
   },
@@ -57,7 +57,7 @@ exports.config = {
     test.deepEqual(grunt.config.process(['<%= arr %>', '<%= obj.Arr %>']), [['foo', 'bar'], ['foo', 'bar']], 'Should expand <%= arr %> and <%= obj.Arr %> values as objects if possible.');
     var buf = grunt.config.process('<%= buffer %>');
     test.ok(Buffer.isBuffer(buf), 'Should retrieve Buffer instances as Buffer.');
-    test.deepEqual(buf, new Buffer('test'), 'Should return buffers as-is.');
+    test.deepEqual(buf, Buffer.from('test'), 'Should return buffers as-is.');
     test.done();
   },
   'config.get': function(test) {
@@ -72,7 +72,7 @@ exports.config = {
     test.deepEqual(grunt.config.get(['obj', 'arr2']), [['foo', 'bar'], ['foo', 'bar']], 'Should expand <%= arr %> and <%= obj.Arr %> values as objects if possible.');
     var buf = grunt.config.get('buffer');
     test.ok(Buffer.isBuffer(buf), 'Should retrieve Buffer instances as Buffer.');
-    test.deepEqual(buf, new Buffer('test'), 'Should return buffers as-is.');
+    test.deepEqual(buf, Buffer.from('test'), 'Should return buffers as-is.');
     test.done();
   },
   'config.set': function(test) {
diff --git a/test/grunt/file_test.js b/test/grunt/file_test.js
index 19889e61c..26ebcbe2e 100644
--- a/test/grunt/file_test.js
+++ b/test/grunt/file_test.js
@@ -567,7 +567,7 @@ exports.file = {
       encoding: null,
       process: function(src) {
         test.ok(Buffer.isBuffer(src), 'when encoding is specified as null, process src as a buffer');
-        return new Buffer('føø' + src.toString() + 'bår');
+        return Buffer.from('føø' + src.toString() + 'bår');
       }
     });
     test.equal(grunt.file.read(tmpfile.path), 'føø' + this.string + 'bår', 'file should be saved as the buffer returned by process.');