diff --git a/package-lock.json b/package-lock.json
index 0c9dca4..cc62fde 100644
--- a/package-lock.json
+++ b/package-lock.json
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+        "commander": {
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+          "resolved": "https://registry.npmjs.org/commander/-/commander-6.2.1.tgz",
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-            "string-width": "^3.0.0",
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-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
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@@ -1773,18 +1492,6 @@
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-      "resolved": "https://registry.npmjs.org/require-directory/-/require-directory-2.1.1.tgz",
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-      "dev": true
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-      "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-2.0.0.tgz",
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-      "dev": true
-    },
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       "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-2.0.0.tgz",
@@ -1861,12 +1568,6 @@
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-      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
-      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
-      "dev": true
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@@ -2064,12 +1765,6 @@
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       "dev": true
     },
-    "uniq": {
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-      "resolved": "https://registry.npmjs.org/uniq/-/uniq-1.0.1.tgz",
-      "integrity": "sha1-sxxa6CVIRKOoKBVBzisEuGWnNP8=",
-      "dev": true
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       "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-1.0.0.tgz",
@@ -2121,6 +1816,12 @@
         "prepend-http": "^1.0.1"
       }
     },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
+    },
     "uuid": {
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       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
@@ -2147,12 +1848,6 @@
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-    "which-module": {
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-      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
-      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
-      "dev": true
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diff --git a/package.json b/package.json
index cb6c61d..06ba491 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   "devDependencies": {
     "clean-css-cli": "4.3.0",
     "lighthouse": "5.2.0",
-    "purgecss": "1.3.0",
+    "purgecss": "4.0.3",
     "tachyons-sass": "^4.9.5"
   }
 }