diff --git a/package.json b/package.json
index b6fbe1c..6667075 100644
--- a/package.json
+++ b/package.json
@@ -21,7 +21,7 @@
     }
   },
   "dependencies": {
-    "@fullhuman/postcss-purgecss": "2.1.0",
+    "@fullhuman/postcss-purgecss": "4.0.0",
     "lodash": "4.17.15"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index b5fbe63..a11b0f9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -148,13 +148,12 @@
   dependencies:
     find-up "^4.0.0"
 
-"@fullhuman/postcss-purgecss@2.1.0":
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/@fullhuman/postcss-purgecss/-/postcss-purgecss-2.1.0.tgz#955fc2e3f69b0d0c84367eeee4f85c01238a65dc"
-  integrity sha512-zmV+cK8pAo/suKMQk1fKzDdols5ltOy86Hk51qwkiJJt4olm3t1MaUrm4U4MlA9fiYeRpLqsNop2xNoEm8DV+w==
+"@fullhuman/postcss-purgecss@4.0.0":
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/@fullhuman/postcss-purgecss/-/postcss-purgecss-4.0.0.tgz#9e27ccdc5d19192af8b59d9d9e4f480cfb5c55c9"
+  integrity sha512-1DNYIDxFsvGOeKdc2BFtIQriMWwzX6dY+9q0Z0n9TNZhFZ9T6nHRZHPC22aYLlPDd0ucCgIr1deTgDTrjq21KQ==
   dependencies:
-    postcss "7.0.27"
-    purgecss "^2.1.0"
+    purgecss "^4.0.0"
 
 "@marionebl/sander@^0.6.0":
   version "0.6.1"
@@ -452,10 +451,15 @@ color-name@~1.1.4:
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.4.tgz#c2a09a87acbde69543de6f63fa3995c826c536a2"
   integrity sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==
 
-commander@^4.0.0:
-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-4.1.1.tgz#9fd602bd936294e9e9ef46a3f4d6964044b18068"
-  integrity sha512-NOKm8xhkzAjzFx8B2v5OAHT+u5pRQc2UCa2Vq9jYL/31o2wi9mxBA7LIFs3sV5VSC49z6pEhfbMULvShKj26WA==
+colorette@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/colorette/-/colorette-1.2.1.tgz#4d0b921325c14faf92633086a536db6e89564b1b"
+  integrity sha512-puCDz0CzydiSYOrnXpz/PKd69zRrribezjtE9yd4zvytoRc8+RY/KJPvtPFKZS3E3wP6neGyMe0vOTlHO5L3Pw==
+
+commander@^6.0.0:
+  version "6.2.1"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-6.2.1.tgz#0792eb682dfbc325999bb2b84fddddba110ac73c"
+  integrity sha512-U7VdrJFnJgo4xjrHpTzu0yrHPGImdsmD95ZlgYSEajAn2JKzDhDTPG9kBTefmObL2w/ngeZnilk+OV9CG3d7UA==
 
 commander@~2.20.3:
   version "2.20.3"
@@ -1789,6 +1793,11 @@ mute-stream@0.0.8:
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.8.tgz#1630c42b2251ff81e2a283de96a5497ea92e5e0d"
   integrity sha512-nnbWWOkoWyUsTjKrhgD0dcz22mdkSnpYqbEjIm2nhwhuxlSkpywJmBo8h0ZqJdkp73mb90SssHkN4rsRaBAfAA==
 
+nanoid@^3.1.20:
+  version "3.1.20"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.20.tgz#badc263c6b1dcf14b71efaa85f6ab4c1d6cfc788"
+  integrity sha512-a1cQNyczgKbLX9jwbS/+d7W8fX/RfgYR7lVWwWOGIPNgK2m0MWvrGF6/m4kk6U3QcFMnZf3RIhL0v2Jgh/0Uxw==
+
 natural-compare@^1.4.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/natural-compare/-/natural-compare-1.4.0.tgz#4abebfeed7541f2c27acfb29bdbbd15c8d5ba4f7"
@@ -2087,14 +2096,14 @@ postcss-selector-parser@^6.0.2:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
-postcss@7.0.27:
-  version "7.0.27"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.27.tgz#cc67cdc6b0daa375105b7c424a85567345fc54d9"
-  integrity sha512-WuQETPMcW9Uf1/22HWUWP9lgsIC+KEHg2kozMflKjbeUtw9ujvFX6QmIfozaErDkmLWS9WEnEdEe6Uo9/BNTdQ==
+postcss@^8.2.1:
+  version "8.2.4"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.4.tgz#20a98a39cf303d15129c2865a9ec37eda0031d04"
+  integrity sha512-kRFftRoExRVXZlwUuay9iC824qmXPcQQVzAjbCCgjpXnkdMCJYBu2gTwAaFBzv8ewND6O8xFb3aELmEkh9zTzg==
   dependencies:
-    chalk "^2.4.2"
+    colorette "^1.2.1"
+    nanoid "^3.1.20"
     source-map "^0.6.1"
-    supports-color "^6.1.0"
 
 prelude-ls@~1.1.2:
   version "1.1.2"
@@ -2116,14 +2125,14 @@ punycode@^2.1.0:
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-2.1.1.tgz#b58b010ac40c22c5657616c8d2c2c02c7bf479ec"
   integrity sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==
 
-purgecss@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/purgecss/-/purgecss-2.1.0.tgz#6da655d166073824efe2532b0c6466c740d939d6"
-  integrity sha512-QnXhowNjeWo9vNnGES2LVzDXdRR/8EvG/O03m4bYOWfAX0ShmG/Pmj7brVtVBy2eaaRAmNy23L+GBc4SpDFUeQ==
+purgecss@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/purgecss/-/purgecss-4.0.0.tgz#25446199df2ec40d418caf4b95c7548a011be3f1"
+  integrity sha512-j/y6OtNpEiggw/ipCJUOMNLgLpeAv9L8q+SqzEdDzyVEZOfdWjg8yvgOxhBflNyYgJ8SZ+tTwPxrHT9vQUpEPw==
   dependencies:
-    commander "^4.0.0"
+    commander "^6.0.0"
     glob "^7.0.0"
-    postcss "7.0.27"
+    postcss "^8.2.1"
     postcss-selector-parser "^6.0.2"
 
 q@^1.5.1:
@@ -2601,13 +2610,6 @@ supports-color@^5.3.0:
   dependencies:
     has-flag "^3.0.0"
 
-supports-color@^6.1.0:
-  version "6.1.0"
-  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-6.1.0.tgz#0764abc69c63d5ac842dd4867e8d025e880df8f3"
-  integrity sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==
-  dependencies:
-    has-flag "^3.0.0"
-
 supports-color@^7.1.0:
   version "7.1.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-7.1.0.tgz#68e32591df73e25ad1c4b49108a2ec507962bfd1"