diff --git a/package-lock.json b/package-lock.json
index cba9b776..7119ad70 100644
--- a/package-lock.json
+++ b/package-lock.json
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           "requires": {
             "has-flag": "^3.0.0"
@@ -12931,9 +12991,9 @@
       }
     },
     "source-map-support": {
-      "version": "0.5.8",
-      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.8.tgz",
-      "integrity": "sha512-WqAEWPdb78u25RfKzOF0swBpY0dKrNdjc4GvLwm7ScX/o9bj8Eh/YL8mcMhBHYDGl87UkkSXDOFnW4G7GhWhGg==",
+      "version": "0.5.9",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.9.tgz",
+      "integrity": "sha512-gR6Rw4MvUlYy83vP0vxoVNzM6t8MUXqNuRsuBmBHQDu1Fh6X015FrLdgoDKcNdkwGubozq0P4N0Q37UyFVr1EA==",
       "requires": {
         "buffer-from": "^1.0.0",
         "source-map": "^0.6.0"
@@ -13336,6 +13396,13 @@
         "commander": "~2.16.0",
         "source-map": "~0.6.1",
         "source-map-support": "~0.5.6"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.16.0",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.16.0.tgz",
+          "integrity": "sha512-sVXqklSaotK9at437sFlFpyOcJonxe0yST/AG9DkQKUdIE6IqGIMv4SfAQSKaJbSdVEJYItASCrBiVQHq1HQew=="
+        }
       }
     },
     "text-encoding": {
@@ -13670,6 +13737,13 @@
       "requires": {
         "commander": "~2.16.0",
         "source-map": "~0.6.1"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.16.0",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.16.0.tgz",
+          "integrity": "sha512-sVXqklSaotK9at437sFlFpyOcJonxe0yST/AG9DkQKUdIE6IqGIMv4SfAQSKaJbSdVEJYItASCrBiVQHq1HQew=="
+        }
       }
     },
     "uglify-to-browserify": {
@@ -13915,15 +13989,6 @@
         "crypto-random-string": "^1.0.0"
       }
     },
-    "units-css": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/units-css/-/units-css-0.4.0.tgz",
-      "integrity": "sha1-1iKGU6UZg9fBb/KPi53Dsf/tOgc=",
-      "requires": {
-        "isnumeric": "^0.2.0",
-        "viewport-dimensions": "^0.2.0"
-      }
-    },
     "universalify": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.1.2.tgz",
@@ -14146,11 +14211,6 @@
         "extsprintf": "^1.2.0"
       }
     },
-    "viewport-dimensions": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/viewport-dimensions/-/viewport-dimensions-0.2.0.tgz",
-      "integrity": "sha1-3nQHR9tTh/0XJfUXXpG6x2r982w="
-    },
     "vm-browserify": {
       "version": "0.0.4",
       "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-0.0.4.tgz",
@@ -14618,9 +14678,9 @@
       },
       "dependencies": {
         "@types/node": {
-          "version": "10.5.8",
-          "resolved": "https://registry.npmjs.org/@types/node/-/node-10.5.8.tgz",
-          "integrity": "sha512-sWSjw+bYW/2W+1V3m8tVsm9PKJcxk3NHN7oRqNUfEdofKg0Imbdu1dQbFvLKjZQXEDXRN6IfSMACjJ7Wv4NGCQ=="
+          "version": "10.7.1",
+          "resolved": "https://registry.npmjs.org/@types/node/-/node-10.7.1.tgz",
+          "integrity": "sha512-EGoI4ylB/lPOaqXqtzAyL8HcgOuCtH2hkEaLmkueOYufsTFWBn4VCvlCDC2HW8Q+9iF+QVC3sxjDKQYjHQeZ9w=="
         },
         "@types/tapable": {
           "version": "0.2.5",
diff --git a/package.json b/package.json
index d5fb889a..42814684 100644
--- a/package.json
+++ b/package.json
@@ -120,9 +120,9 @@
     "optimize-css-assets-webpack-plugin": "3.2.0",
     "ora": "1.3.0",
     "pkg-dir": "2.0.0",
-    "postcss-cssnext": "3.1.0",
     "postcss-import": "11.0.0",
     "postcss-loader": "2.0.8",
+    "postcss-preset-env": "5.3.0",
     "slash": "1.0.0",
     "source-map-loader-cli": "0.0.1",
     "strip-ansi": "4.0.0",
diff --git a/src/base.config.ts b/src/base.config.ts
index 4117d4d5..54412d03 100644
--- a/src/base.config.ts
+++ b/src/base.config.ts
@@ -10,6 +10,7 @@ import * as loaderUtils from 'loader-utils';
 import * as ts from 'typescript';
 import getFeatures from '@dojo/webpack-contrib/static-build-loader/getFeatures';
 
+const postcssPresetEnv = require('postcss-preset-env');
 const IgnorePlugin = require('webpack/lib/IgnorePlugin');
 const AutoRequireWebpackPlugin = require('auto-require-webpack-plugin');
 const slash = require('slash');
@@ -174,8 +175,9 @@ export default function webpackConfigFactory(args: any): WebpackConfiguration {
 					ident: 'postcss',
 					plugins: [
 						require('postcss-import')(),
-						require('postcss-cssnext')({
-							features: { autoprefixer: { browsers: ['last 2 versions', 'ie >= 10'] } }
+						postcssPresetEnv({
+							browsers: args.legacy ? ['last 2 versions', 'ie >= 10'] : ['last 2 versions'],
+							grid: args.legacy
 						})
 					]
 				}
@@ -198,8 +200,9 @@ export default function webpackConfigFactory(args: any): WebpackConfiguration {
 					ident: 'postcss',
 					plugins: [
 						require('postcss-import')(),
-						require('postcss-cssnext')({
-							features: { autoprefixer: { browsers: ['last 2 versions', 'ie >= 10'] } }
+						postcssPresetEnv({
+							browsers: args.legacy ? ['last 2 versions', 'ie >= 10'] : ['last 2 versions'],
+							grid: args.legacy
 						})
 					]
 				}