diff --git a/packages/storybook/package.json b/packages/storybook/package.json
index a604a67..7855fd2 100644
--- a/packages/storybook/package.json
+++ b/packages/storybook/package.json
@@ -35,7 +35,7 @@
     "postcss-for": "2.1.1",
     "postcss-import": "12.0.1",
     "postcss-mixins": "6.2.3",
-    "postcss-nested": "4.2.1",
+    "postcss-nested": "6.0.1",
     "postcss-omit-import-tilde": "1.0.1",
     "storybook-vue-router": "1.0.7",
     "vue-loader": "^15.9.2",
diff --git a/packages/vuepress-theme-tsed/package.json b/packages/vuepress-theme-tsed/package.json
index 0f75d55..4a8aeef 100644
--- a/packages/vuepress-theme-tsed/package.json
+++ b/packages/vuepress-theme-tsed/package.json
@@ -46,7 +46,7 @@
     "postcss-for": "2.1.1",
     "postcss-import": "12.0.1",
     "postcss-mixins": "6.2.3",
-    "postcss-nested": "4.2.1",
+    "postcss-nested": "6.0.1",
     "postcss-omit-import-tilde": "1.0.1",
     "prismjs": "^1.28.0",
     "stylus": "^0.54.5",
diff --git a/yarn.lock b/yarn.lock
index 4c6e4f6..9d109e8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -17044,13 +17044,12 @@ postcss-modules-values@^3.0.0:
     icss-utils "^4.0.0"
     postcss "^7.0.6"
 
-postcss-nested@4.2.1:
-  version "4.2.1"
-  resolved "https://registry.npmjs.org/postcss-nested/-/postcss-nested-4.2.1.tgz"
-  integrity sha512-AMayXX8tS0HCp4O4lolp4ygj9wBn32DJWXvG6gCv+ZvJrEa00GUxJcJEEzMh87BIe6FrWdYkpR2cuyqHKrxmXw==
+postcss-nested@6.0.1:
+  version "6.0.1"
+  resolved "https://registry.yarnpkg.com/postcss-nested/-/postcss-nested-6.0.1.tgz#f83dc9846ca16d2f4fa864f16e9d9f7d0961662c"
+  integrity sha512-mEp4xPMi5bSWiMbsgoPfcP74lsWLHkQbZc3sY+jWYd65CUwXrUaTp0fmNpa01ZcETKlIgUdFN/MpS2xZtqL9dQ==
   dependencies:
-    postcss "^7.0.21"
-    postcss-selector-parser "^6.0.2"
+    postcss-selector-parser "^6.0.11"
 
 postcss-nested@^4.1.1:
   version "4.2.3"
@@ -17193,14 +17192,12 @@ postcss-selector-parser@^3.0.0:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
-postcss-selector-parser@^6.0.0, postcss-selector-parser@^6.0.2:
-  version "6.0.4"
-  resolved "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.0.4.tgz"
-  integrity sha512-gjMeXBempyInaBqpp8gODmwZ52WaYsVOsfr4L4lDQ7n3ncD6mEyySiDtgzCT+NYC0mmeOLvtsF8iaEf0YT6dBw==
+postcss-selector-parser@^6.0.0, postcss-selector-parser@^6.0.11, postcss-selector-parser@^6.0.2:
+  version "6.0.11"
+  resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-6.0.11.tgz#2e41dc39b7ad74046e1615185185cd0b17d0c8dc"
+  integrity sha512-zbARubNdogI9j7WY4nQJBiNqQf3sLS3wCP4WfOidu+p28LofJqDH1tcXypGrcmMHhDk2t9wGhCsYe/+szLTy1g==
   dependencies:
     cssesc "^3.0.0"
-    indexes-of "^1.0.1"
-    uniq "^1.0.1"
     util-deprecate "^1.0.2"
 
 postcss-simple-vars@^2.0.0:
@@ -17281,16 +17278,7 @@ postcss@^6.0.1, postcss@^6.0.9:
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
-postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.11, postcss@^7.0.14, postcss@^7.0.18, postcss@^7.0.2, postcss@^7.0.21, postcss@^7.0.23, postcss@^7.0.26, postcss@^7.0.27, postcss@^7.0.30, postcss@^7.0.32, postcss@^7.0.5, postcss@^7.0.6:
-  version "7.0.35"
-  resolved "https://registry.npmjs.org/postcss/-/postcss-7.0.35.tgz"
-  integrity sha512-3QT8bBJeX/S5zKTTjTCIjRF3If4avAT6kqxcASlTWEtAFCb9NH0OUxNDfgZSWdP5fJnBYCMEWkIFfWeugjzYMg==
-  dependencies:
-    chalk "^2.4.2"
-    source-map "^0.6.1"
-    supports-color "^6.1.0"
-
-postcss@^7.0.35, postcss@^7.0.36:
+postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.11, postcss@^7.0.14, postcss@^7.0.18, postcss@^7.0.2, postcss@^7.0.21, postcss@^7.0.23, postcss@^7.0.26, postcss@^7.0.27, postcss@^7.0.30, postcss@^7.0.32, postcss@^7.0.35, postcss@^7.0.36, postcss@^7.0.5, postcss@^7.0.6:
   version "7.0.39"
   resolved "https://registry.npmjs.org/postcss/-/postcss-7.0.39.tgz"
   integrity sha512-yioayjNbHn6z1/Bywyb2Y4s3yvDAeXGOyxqD+LnVOinq6Mdmd++SW2wUNVzavyyHxd6+DxzWGIuosg6P1Rj8uA==