diff --git a/package-lock.json b/package-lock.json
index 0c9dca4..c50de0f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -206,23 +206,39 @@
       "dev": true
     },
     "clean-css": {
-      "version": "4.2.1",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.1.tgz",
-      "integrity": "sha512-4ZxI6dy4lrY6FHzfiy1aEOXgu4LIsW2MhwG0VBKdcoGoH/XLFgaHSdLTGr4O8Be6A8r3MOphEiI8Gc1n0ecf3g==",
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.0.1.tgz",
+      "integrity": "sha512-F1zAGOowUCg8yxT0O4UR+nmbMauf3YwbiUS60CPxpzJU7ulpamGzQomFrJSK4w/HqHtMmQKSHJUNue+dQQYQdg==",
       "dev": true,
       "requires": {
         "source-map": "~0.6.0"
       }
     },
     "clean-css-cli": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/clean-css-cli/-/clean-css-cli-4.3.0.tgz",
-      "integrity": "sha512-8GHZfr+mG3zB/Lgqrr27qHBFsPSn0fyEI3f2rIZpxPxUbn2J6A8xyyeBRVTW8duDuXigN0s80vsXiXJOEFIO5Q==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/clean-css-cli/-/clean-css-cli-5.0.0.tgz",
+      "integrity": "sha512-/oop9svxk5zbqxWPco+O24FN+gALRtjF2Iac9vzcye81JlbyT0O6nT2IZvr2gHPtio4EFTfvGcsHqivDhg2y8g==",
       "dev": true,
       "requires": {
-        "clean-css": "^4.2.1",
-        "commander": "2.x",
-        "glob": "7.x"
+        "clean-css": "^5.0.1",
+        "commander": "7.x",
+        "glob": "^7.1.6"
+      },
+      "dependencies": {
+        "glob": {
+          "version": "7.1.6",
+          "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz",
+          "integrity": "sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==",
+          "dev": true,
+          "requires": {
+            "fs.realpath": "^1.0.0",
+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
+            "path-is-absolute": "^1.0.0"
+          }
+        }
       }
     },
     "cli-boxes": {
@@ -327,9 +343,9 @@
       }
     },
     "commander": {
-      "version": "2.20.0",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
-      "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-7.0.0.tgz",
+      "integrity": "sha512-ovx/7NkTrnPuIV8sqk/GjUIIM1+iUQeqA3ye2VNpq9sVoiZsooObWlQy+OPWGI17GDaEoybuAGJm6U8yC077BA==",
       "dev": true
     },
     "concat-map": {
diff --git a/package.json b/package.json
index cb6c61d..4e3a694 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "natives": "1.1.3"
   },
   "devDependencies": {
-    "clean-css-cli": "4.3.0",
+    "clean-css-cli": "5.0.0",
     "lighthouse": "5.2.0",
     "purgecss": "1.3.0",
     "tachyons-sass": "^4.9.5"