diff --git a/package-lock.json b/package-lock.json
index 66e1cbc..298fe03 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -69,6 +69,11 @@
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@@ -6179,12 +6038,14 @@
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       "integrity": "sha1-hGFzP1OLCDfJNh45qauelwTcLyg=",
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-      "integrity": "sha1-1JMwx4ntgZ4nakwNJy3/owsY/m4="
+      "integrity": "sha1-1JMwx4ntgZ4nakwNJy3/owsY/m4=",
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-      "integrity": "sha1-wc56MWjIxmFAM6S194d/OyJfnDg="
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-      "integrity": "sha1-ZouTd26q5V696POtRkswekljYl4="
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+      "integrity": "sha1-UFMN+4T8yap9vnhS6Do3uTufKqY=",
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-      "integrity": "sha1-hut1OSgF3cM69xySoO7fdO52BLI="
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-      "integrity": "sha1-mqIOtq7rv/d/vTPnTKAbM1gdOhY="
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-      "integrity": "sha1-YTObbyR1/Hcv2cnYP1yFddwVSuE="
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-      "integrity": "sha1-PMWfAAJRlLarLjjbrmaJJWtmBXI="
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@@ -7642,6 +7504,11 @@
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-      "dev": true,
+    "obuf": {
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@@ -8767,6 +8555,11 @@
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@@ -9287,6 +9080,21 @@
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+        "postcss-selector-parser": {
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+          "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.0.6.tgz",
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           "requires": {
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+            "cssesc": "^3.0.0",
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@@ -12132,7 +11172,8 @@
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       "version": "1.5.1",
       "resolved": "http://registry.npm.taobao.org/q/download/q-1.5.1.tgz",
-      "integrity": "sha1-fjL3W0E4EpHQRhHxvxQQmsAGUdc="
+      "integrity": "sha1-fjL3W0E4EpHQRhHxvxQQmsAGUdc=",
+      "dev": true
     },
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@@ -12672,12 +11713,14 @@
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-      "integrity": "sha1-wODWiC3w4jviVKR16O3UGRX+rrE="
+      "integrity": "sha1-wODWiC3w4jviVKR16O3UGRX+rrE=",
+      "dev": true
     },
     "rgba-regex": {
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       "resolved": "http://registry.npm.taobao.org/rgba-regex/download/rgba-regex-1.0.0.tgz",
-      "integrity": "sha1-QzdOLiyglosO8VI0YLfXMP8i7rM="
+      "integrity": "sha1-QzdOLiyglosO8VI0YLfXMP8i7rM=",
+      "dev": true
     },
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@@ -12958,7 +12001,8 @@
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-      "integrity": "sha1-KBYjTiN4vdxOU1T6tcqold9xANk="
+      "integrity": "sha1-KBYjTiN4vdxOU1T6tcqold9xANk=",
+      "dev": true
     },
     "schema-utils": {
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@@ -13013,7 +12057,8 @@
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-      "integrity": "sha1-3Eu8emyp2Rbe5dQ1FvAJK1j3uKs="
+      "integrity": "sha1-3Eu8emyp2Rbe5dQ1FvAJK1j3uKs=",
+      "dev": true
     },
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@@ -13502,7 +12547,8 @@
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-      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw="
+      "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
+      "dev": true
     },
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@@ -14155,11 +13201,6 @@
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@@ -14318,17 +13359,7 @@
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+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
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@@ -14372,7 +13403,8 @@
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-      "integrity": "sha1-f8te759WI7FWvOqJ7DfWNnbyGAE="
+      "integrity": "sha1-f8te759WI7FWvOqJ7DfWNnbyGAE=",
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@@ -15120,6 +14152,11 @@
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       "dev": true
     },
+    "yaml": {
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+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-1.10.2.tgz",
+      "integrity": "sha512-r3vXyErRCYJ7wg28yvBY5VSoAF8ZvlcW9/BwUzEtUsjvX/DKs24dIkuwjtuprwJJHsbyUbLApepYTR1BN4uHrg=="
+    },
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diff --git a/package.json b/package.json
index 874713c..e320aa2 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,7 @@
     "build": "node build/build.js"
   },
   "dependencies": {
-    "cssnano": "^4.0.0",
+    "cssnano": "^5.0.0",
     "normalize.css": "^8.0.0",
     "postcss-aspect-ratio-mini": "0.0.2",
     "postcss-cssnext": "^3.1.0",