diff --git a/CHANGELOG.md b/CHANGELOG.md
index 950225b..f0c629f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 1.5.0 - 2015-05-23
+
+- Added: `compress` option used cssnano instead of CSSWring.
+
 # 1.4.0 - 2015-05-01
 
 - Added: support for `:matches()` selector pseudo class
diff --git a/README.md b/README.md
index 34f77a8..04c86dc 100644
--- a/README.md
+++ b/README.md
@@ -306,8 +306,8 @@ _Note: you can pass [postcss-url options](https://github.com/postcss/postcss-url
 
 ##### `compress` (default: `false`)
 
-Allows you to compress the output (using [CSSWring](https://github.com/hail2u/node-csswring)).
-You can enable minification by passing `true` or by providing an object containing [CSSWring options](https://github.com/hail2u/node-csswring#options).
+Allows you to compress the output (using [cssnano](https://github.com/ben-eb/cssnano)).
+You can enable minification by passing `true` or by providing an object containing [cssnano options](https://github.com/ben-eb/cssnano#options).
 
 ##### `sourcemap` (default: `false`)
 
diff --git a/index.js b/index.js
index b5426c4..dd6d8a5 100644
--- a/index.js
+++ b/index.js
@@ -141,8 +141,17 @@ function cssnext(string, options) {
 
   // minification
   if (options.compress) {
-    var csswring = require("csswring")
-    postcssInstance.use(typeof options.compress === "object" ? csswring(options.compress) : csswring)
+    var nano = require("cssnano")
+
+    /* forced calc options to false */
+    if (typeof options.compress === "object") {
+      options.compress.calc = false
+    }
+    else {
+      options.compress = {calc: false}
+    }
+
+    postcssInstance.use(nano(options.compress))
   }
 
   // classic API if string is passed
diff --git a/package.json b/package.json
index e8e77c6..b592f04 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cssnext",
-  "version": "1.4.0",
+  "version": "1.5.0",
   "description": "Use tomorrow's CSS syntax, today",
   "keywords": [
     "css",
@@ -32,7 +32,7 @@
     "chokidar": "^1.0.0",
     "colors": "^1.0.2",
     "commander": "^2.3.0",
-    "csswring": "^3.0.0",
+    "cssnano": "^1.2.0",
     "exit": "^0.1.2",
     "object-assign": "^2.0.0",
     "pixrem": "^1.1.0",
diff --git a/test/cli.js b/test/cli.js
index 7ff6c92..3189c9e 100644
--- a/test/cli.js
+++ b/test/cli.js
@@ -90,7 +90,7 @@ test("cli", function(t) {
 
   exec(cssnextBin + " --compress test/fixtures/compress.css", function(err, stdout) {
     if (err) { throw err }
-    t.equal(stdout, utils.readFixture("compress.default.expected").trim(), "should compress on --compress")
+    t.equal(stdout.trim(), utils.readFixture("compress.default.expected").trim(), "should compress on --compress")
   })
   planned += 1
 
diff --git a/test/option.compress.js b/test/option.compress.js
index a342d8d..cd15d8e 100644
--- a/test/option.compress.js
+++ b/test/option.compress.js
@@ -16,7 +16,7 @@ test("cssnext compress option", function(t) {
 
   // compress option
   t.equal(cssnext(input, {compress: true}).trim(), expected.default, "should be able to compress")
-  t.equal(cssnext(input, {compress: {removeAllComments: true}}).trim(), expected.options, "should be able to compress with options")
+  t.equal(cssnext(input, {compress: {comments: {removeAll: true}}}).trim(), expected.options, "should be able to compress with options")
   t.equal(postcss().use(cssnext({compress: true})).process(input).css.trim(), expected.default, "should be able to compress even as a postcss plugin")
 
   t.end()