diff --git a/package-lock.json b/package-lock.json
index 5c7e1b61..c43762b5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,12 @@
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@@ -1388,6 +1433,18 @@
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+          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "5.5.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+          "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
+        }
       }
     },
     "symbol-tree": {
@@ -8054,6 +10072,12 @@
       "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8=",
       "dev": true
     },
+    "timsort": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/timsort/-/timsort-0.3.0.tgz",
+      "integrity": "sha1-QFQRqOfmM5/mTbmiNN4R3DHgK9Q=",
+      "dev": true
+    },
     "tiny-emitter": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/tiny-emitter/-/tiny-emitter-2.0.2.tgz",
@@ -8247,6 +10271,12 @@
       "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
       "dev": true
     },
+    "unquote": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/unquote/-/unquote-1.1.1.tgz",
+      "integrity": "sha1-j97XMk7G6IoP+LkF58CYzcCG1UQ=",
+      "dev": true
+    },
     "unset-value": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
@@ -8335,6 +10365,16 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "util.promisify": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/util.promisify/-/util.promisify-1.0.0.tgz",
+      "integrity": "sha512-i+6qA2MPhvoKLuxnJNpXAGhg7HphQOSUq2LKMZD0m15EiskXUkMvKdF4Uui0WYeCUGea+o2cw/ZuwehtfsrNkA==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "object.getownpropertydescriptors": "^2.0.3"
+      }
+    },
     "utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
@@ -8364,9 +10404,9 @@
       "dev": true
     },
     "vendors": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/vendors/-/vendors-1.0.2.tgz",
-      "integrity": "sha512-w/hry/368nO21AN9QljsaIhb9ZiZtZARoVH5f3CsFbawdLdayCgKRPup7CggujvySMxx0I91NOyxdVENohprLQ==",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/vendors/-/vendors-1.0.3.tgz",
+      "integrity": "sha512-fOi47nsJP5Wqefa43kyWSg80qF+Q3XA6MUkgi7Hp1HQaKDQW4cQrK2D0P7mmbFtsV1N89am55Yru/nyEwRubcw==",
       "dev": true
     },
     "verror": {
@@ -8463,12 +10503,6 @@
         "webidl-conversions": "^4.0.2"
       }
     },
-    "whet.extend": {
-      "version": "0.9.9",
-      "resolved": "https://registry.npmjs.org/whet.extend/-/whet.extend-0.9.9.tgz",
-      "integrity": "sha1-+HfVv2SMl+WqVC+twW1qJZucEaE=",
-      "dev": true
-    },
     "which": {
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       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
diff --git a/package.json b/package.json
index bd63d084..f849e3c8 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
     "chokidar": "^2.0.2",
     "conventional-changelog-cli": "^1.3.5",
     "cross-env": "^5.1.3",
-    "cssnano": "^3.10.0",
+    "cssnano": "^4.1.10",
     "eslint": "^4.14.0",
     "eslint-config-xo-space": "^0.18.0",
     "esm": "^3.1.4",