diff --git a/package-lock.json b/package-lock.json
index c3d0f12..ed74972 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -841,13 +841,12 @@
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     },
     "@fullhuman/postcss-purgecss": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/@fullhuman/postcss-purgecss/-/postcss-purgecss-1.2.0.tgz",
-      "integrity": "sha512-An05jbnZVUrX+VVNniaNQtOuo/S7tyQu5x86itXTF+7kfMaGxglFGykFX2KCt2hcbJijbvfCval9IkPO19V1KA==",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/@fullhuman/postcss-purgecss/-/postcss-purgecss-4.0.3.tgz",
+      "integrity": "sha512-/EnQ9UDWGGqHkn1UKAwSgh+gJHPKmD+Z+5dQ4gWT4qq2NUyez3zqAfZNwFH3eSgmgO+wjTXfhlLchx2M9/K+7Q==",
       "dev": true,
       "requires": {
-        "postcss": "^7.0.14",
-        "purgecss": "^1.3.0"
+        "purgecss": "^4.0.3"
       }
     },
     "@types/anymatch": {
@@ -2027,6 +2026,12 @@
         "simple-swizzle": "^0.2.2"
       }
     },
+    "colorette": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/colorette/-/colorette-1.2.2.tgz",
+      "integrity": "sha512-MKGMzyfeuutC/ZJ1cba9NqcNpfeqMUcYmyF1ZFY6/Cn7CNSAKx6a+s48sqLqyAiZuaP2TcqMhoo+dlwFnVxT9w==",
+      "dev": true
+    },
     "commander": {
       "version": "2.20.0",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
@@ -5981,6 +5986,12 @@
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       "optional": true
     },
+    "nanoid": {
+      "version": "3.1.22",
+      "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.1.22.tgz",
+      "integrity": "sha512-/2ZUaJX2ANuLtTvqTlgqBQNJoQO398KyJgZloL0PZkC0dpysjncRUPsFe3DUPzz/y3h+u7C46np8RMuvF3jsSQ==",
+      "dev": true
+    },
     "nanomatch": {
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       "resolved": "https://registry.npmjs.org/nanomatch/-/nanomatch-1.2.13.tgz",
@@ -7542,15 +7553,34 @@
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-      "version": "1.4.0",
-      "resolved": "https://registry.npmjs.org/purgecss/-/purgecss-1.4.0.tgz",
-      "integrity": "sha512-or7/16i7O6DH+NpXqY8NCcWCc940O6PxOgjWAcMTElzgccKOJua1/n6JVtM8UYqoMMWoCyKk+CbLpo4+4mY3BQ==",
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/purgecss/-/purgecss-4.0.3.tgz",
+      "integrity": "sha512-PYOIn5ibRIP34PBU9zohUcCI09c7drPJJtTDAc0Q6QlRz2/CHQ8ywGLdE7ZhxU2VTqB7p5wkvj5Qcm05Rz3Jmw==",
       "dev": true,
       "requires": {
-        "glob": "^7.1.3",
-        "postcss": "^7.0.14",
-        "postcss-selector-parser": "^6.0.0",
-        "yargs": "^14.0.0"
+        "commander": "^6.0.0",
+        "glob": "^7.0.0",
+        "postcss": "^8.2.1",
+        "postcss-selector-parser": "^6.0.2"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "6.2.1",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-6.2.1.tgz",
+          "integrity": "sha512-U7VdrJFnJgo4xjrHpTzu0yrHPGImdsmD95ZlgYSEajAn2JKzDhDTPG9kBTefmObL2w/ngeZnilk+OV9CG3d7UA==",
+          "dev": true
+        },
+        "postcss": {
+          "version": "8.2.8",
+          "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.2.8.tgz",
+          "integrity": "sha512-1F0Xb2T21xET7oQV9eKuctbM9S7BC0fetoHCc4H13z0PT6haiRLP4T0ZY4XWh7iLP0usgqykT6p9B2RtOf4FPw==",
+          "dev": true,
+          "requires": {
+            "colorette": "^1.2.2",
+            "nanoid": "^3.1.20",
+            "source-map": "^0.6.1"
+          }
+        }
       }
     },
     "q": {
@@ -10107,25 +10137,6 @@
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       "dev": true
     },
-    "yargs": {
-      "version": "14.0.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-14.0.0.tgz",
-      "integrity": "sha512-ssa5JuRjMeZEUjg7bEL99AwpitxU/zWGAGpdj0di41pOEmJti8NR6kyUIJBkR78DTYNPZOU08luUo0GTHuB+ow==",
-      "dev": true,
-      "requires": {
-        "cliui": "^5.0.0",
-        "decamelize": "^1.2.0",
-        "find-up": "^3.0.0",
-        "get-caller-file": "^2.0.1",
-        "require-directory": "^2.1.1",
-        "require-main-filename": "^2.0.0",
-        "set-blocking": "^2.0.0",
-        "string-width": "^3.0.0",
-        "which-module": "^2.0.0",
-        "y18n": "^4.0.0",
-        "yargs-parser": "^13.1.1"
-      }
-    },
     "yargs-parser": {
       "version": "13.1.1",
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
diff --git a/package.json b/package.json
index f588283..e89cc05 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "@babel/core": "^7.6.0",
     "@babel/plugin-transform-runtime": "^7.6.0",
     "@babel/preset-env": "^7.6.0",
-    "@fullhuman/postcss-purgecss": "^1.2.0",
+    "@fullhuman/postcss-purgecss": "^4.0.3",
     "autoprefixer": "^9.6.1",
     "clean-webpack-plugin": "^3.0.0",
     "copy-webpack-plugin": "^5.0.4",