diff --git a/.travis.yml b/.travis.yml
index 1c9c17d..0aa55fa 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: node_js
 node_js:
-  - "0.10"
+  - "14.13.0"
 before_script:
   - npm install grunt-cli
\ No newline at end of file
diff --git a/Gruntfile.js b/Gruntfile.js
index fac8a87..4962be4 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -24,7 +24,7 @@ module.exports = function (grunt) {
 
         // Before generating any new files, remove any previously-created files.
         clean: {
-            tests: ['test/fixtures/tmp_*.css','test/fixtures/dest/*.resorted.css'],
+            tests: ['test/fixtures/tmp_*.css', 'test/fixtures/dest/*.resorted.css', 'test/fixtures/src/*.resorted.css'],
         },
 
         // Configuration to be run (and then tested).
@@ -54,6 +54,10 @@ module.exports = function (grunt) {
                 src: ['*.css', '!*.resorted.css'],
                 dest: 'test/fixtures/dest/',
                 ext: '.resorted.css'
+            },
+            src_only: {
+                src: ['test/fixtures/src/*.css', '!test/fixtures/src/*.resorted.css'],
+                ext: '.resorted.css'
             }
         },
 
diff --git a/README.md b/README.md
index 2012d08..a9d7db2 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@
 
 ## Getting Started
 
-This plugin requires Grunt `>=0.4.x`.
+This plugin requires Grunt `>=1.0.x`.
 
 If you haven't used [Grunt](http://gruntjs.com/) before, be sure to check out the [Getting Started](http://gruntjs.com/getting-started) guide, as it explains how to create a [Gruntfile](http://gruntjs.com/sample-gruntfile) as well as install and use Grunt plugins. Once you're familiar with that process, you may install this plugin with this command:
 
@@ -101,8 +101,26 @@ grunt.initConfig({
 });
 ```
 
+#### Src Only
+
+If you provide only a `src` with no value for `dest`, then `dest` will automatically be set to the `src` directory.
+
+```js
+grunt.initConfig({
+    csscomb: {
+        src_only: {
+            src: ['foo/bar.css'],
+            ext: '.resorted.css'
+        }
+    }
+});
+```
+
 ## Release History
 
++ v4.2.0: Update dependencies.
++ v4.1.0: Update csscomb.js to v4.3.0; update dependencies.
++ v4.0.0: Update csscomb.js to v4; update dependencies; allow src only.
 + v3.1.1: Update grunt version.
 + v3.0.0: Update csscomb.js to v3.0 but `grunt-csscomb` API doesn't change.
 + v2.0.1: Stop searching config if we reach root directory.
diff --git a/package.json b/package.json
index ea861a8..00db708 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "grunt-csscomb",
   "description": "The grunt plugin for sorting CSS properties in specific order.",
-  "version": "3.1.1",
+  "version": "4.2.0",
   "homepage": "https://github.com/csscomb/grunt-csscomb",
   "author": [
     {
@@ -37,22 +37,22 @@
   ],
   "main": "Gruntfile.js",
   "engines": {
-    "node": ">= 0.10.0"
+    "node": ">= 10.0.0"
   },
   "scripts": {
     "test": "grunt test"
   },
   "dependencies": {
-    "csscomb": "~3.1.0"
+    "csscomb": "~4.3.0"
   },
   "devDependencies": {
-    "grunt": "^0.4.5",
-    "grunt-contrib-clean": "^0.6.0",
-    "grunt-contrib-jshint": "^0.11.2",
-    "grunt-contrib-nodeunit": "^0.4.1"
+    "grunt": "^1.3.0",
+    "grunt-contrib-clean": "^2.0.0",
+    "grunt-contrib-jshint": "^2.1.0",
+    "grunt-contrib-nodeunit": "^2.1.0"
   },
   "peerDependencies": {
-    "grunt": ">=0.4.0"
+    "grunt": ">=1.0.0"
   },
   "keywords": [
     "gruntplugin",
diff --git a/tasks/csscomb.js b/tasks/csscomb.js
index 305f3f3..8f2042a 100644
--- a/tasks/csscomb.js
+++ b/tasks/csscomb.js
@@ -71,17 +71,21 @@ module.exports = function (grunt) {
                     return true;
                 }
             }).forEach(function (src) {
+                var dest = f.dest, 
+                syntax = src.split('.').pop();
+                if (!dest) {
+                    dest = grunt.file.expandMapping(src, '', { ext: f.ext || '.' + syntax })[0].dest;
+                }
 
                 // Get CSS from a source file:
                 var css = grunt.file.read(src);
-                var combed;
 
                 // Comb it:
                 grunt.log.ok('Sorting file "' + src + '"...');
-                var syntax = src.split('.').pop();
                 try {
-                    combed = comb.processString(css, { syntax: syntax });
-                    grunt.file.write(f.dest, combed);
+                    comb.processString(css, { syntax: syntax }).then(function(combed) {
+                        grunt.file.write(dest, combed);
+                    });
                 } catch(e) {
                     grunt.log.error(e);
                 }
diff --git a/test/csscomb_test.js b/test/csscomb_test.js
index 2ee9207..aaa323a 100644
--- a/test/csscomb_test.js
+++ b/test/csscomb_test.js
@@ -8,7 +8,7 @@ exports.csscomb = {
 
         var actual = grunt.file.read('test/fixtures/tmp_resort.css');
         var expected = grunt.file.read('test/expected/resort.css');
-        test.equal(actual, expected, 'sholud be sorted.');
+        test.equal(actual, expected, 'should be sorted.');
 
         test.done();
     },
@@ -17,7 +17,7 @@ exports.csscomb = {
 
         var actual = grunt.file.read('test/fixtures/tmp_customsort.css');
         var expected = grunt.file.read('test/expected/customsort.css');
-        test.equal(actual, expected, 'sholud be custom sorted.');
+        test.equal(actual, expected, 'should be custom sorted.');
 
         test.done();
     },
@@ -26,11 +26,11 @@ exports.csscomb = {
 
         var actual = grunt.file.read('test/fixtures/tmp_multi1.css');
         var expected = grunt.file.read('test/expected/multi1.css');
-        test.equal(actual, expected, 'sholud be sorted.');
+        test.equal(actual, expected, 'should be sorted.');
 
         var actual2 = grunt.file.read('test/fixtures/tmp_multi2.css');
         var expected2 = grunt.file.read('test/expected/multi2.css');
-        test.equal(actual2, expected2, 'sholud be sorted.');
+        test.equal(actual2, expected2, 'should be sorted.');
 
         test.done();
     },
@@ -39,11 +39,24 @@ exports.csscomb = {
 
         var actual = grunt.file.read('test/fixtures/dest/multi1.resorted.css');
         var expected = grunt.file.read('test/expected/multi1.css');
-        test.equal(actual, expected, 'sholud be sorted.');
+        test.equal(actual, expected, 'should be sorted.');
 
         var actual2 = grunt.file.read('test/fixtures/dest/multi2.resorted.css');
         var expected2 = grunt.file.read('test/expected/multi2.css');
-        test.equal(actual2, expected2, 'sholud be sorted.');
+        test.equal(actual2, expected2, 'should be sorted.');
+
+        test.done();
+    },
+    src_only: function (test) {
+        test.expect(2);
+
+        var actual = grunt.file.read('test/fixtures/src/multi1.resorted.css');
+        var expected = grunt.file.read('test/expected/multi1.css');
+        test.equal(actual, expected, 'should be sorted.');
+
+        var actual2 = grunt.file.read('test/fixtures/src/multi2.resorted.css');
+        var expected2 = grunt.file.read('test/expected/multi2.css');
+        test.equal(actual2, expected2, 'should be sorted.');
 
         test.done();
     }
diff --git a/test/fixtures/src/multi1.css b/test/fixtures/src/multi1.css
new file mode 100644
index 0000000..c3944af
--- /dev/null
+++ b/test/fixtures/src/multi1.css
@@ -0,0 +1,13 @@
+.multi1 {
+	z-index: 100;
+	display: block;
+	visibility: hidden;
+	max-height: 44px;
+	width: 100px;
+	height: 100px;
+	border-color: 1px #000 solid;
+	background-color: red;
+	vertical-align: 5px;
+	text-align: center;
+	font-weight: bold;
+}
\ No newline at end of file
diff --git a/test/fixtures/src/multi1.resorted.css b/test/fixtures/src/multi1.resorted.css
new file mode 100644
index 0000000..481901a
--- /dev/null
+++ b/test/fixtures/src/multi1.resorted.css
@@ -0,0 +1,19 @@
+.multi1
+{
+    font-weight: bold;
+
+    z-index: 100;
+
+    display: block;
+    visibility: hidden;
+
+    width: 100px;
+    height: 100px;
+    max-height: 44px;
+
+    text-align: center;
+    vertical-align: 5px;
+
+    border-color: 1px #000 solid;
+    background-color: red;
+}
diff --git a/test/fixtures/src/multi2.css b/test/fixtures/src/multi2.css
new file mode 100644
index 0000000..2ec4d0b
--- /dev/null
+++ b/test/fixtures/src/multi2.css
@@ -0,0 +1,13 @@
+.multi2 {
+	position: absolute;
+	top: 10px;
+	left: 10px;
+	z-index: 10;
+	display: table;
+	float: left;
+	margin: 10px;
+	padding: 10px;
+	width: 10px;
+	height: 10px;
+	border: 1px #fff solid;
+}
\ No newline at end of file
diff --git a/test/fixtures/src/multi2.resorted.css b/test/fixtures/src/multi2.resorted.css
new file mode 100644
index 0000000..7af8039
--- /dev/null
+++ b/test/fixtures/src/multi2.resorted.css
@@ -0,0 +1,17 @@
+.multi2
+{
+    position: absolute;
+    z-index: 10;
+    top: 10px;
+    left: 10px;
+
+    display: table;
+    float: left;
+
+    width: 10px;
+    height: 10px;
+    margin: 10px;
+    padding: 10px;
+
+    border: 1px #fff solid;
+}