diff --git a/docs/package-lock.json b/docs/package-lock.json
index ed91a7e6..d5b37af1 100644
--- a/docs/package-lock.json
+++ b/docs/package-lock.json
@@ -3323,13 +3323,21 @@
       }
     },
     "css-tree": {
-      "version": "1.0.0-alpha.33",
-      "resolved": "https://registry.npmjs.org/css-tree/-/css-tree-1.0.0-alpha.33.tgz",
-      "integrity": "sha512-SPt57bh5nQnpsTBsx/IXbO14sRc9xXu5MtMAVuo0BaQQmyf0NupNPPSoMaqiAF5tDFafYsTkfeH4Q/HCKXkg4w==",
+      "version": "1.0.0-alpha.38",
+      "resolved": "https://registry.npmjs.org/css-tree/-/css-tree-1.0.0-alpha.38.tgz",
+      "integrity": "sha512-pWuxS4kaECFopOc1NZff+dYdw+brc1Tt0UAuTiw56/Trtae4NdHtbDH24311UWfMmcpZe7jLy0e64ZeJg9t7bQ==",
       "dev": true,
       "requires": {
-        "mdn-data": "2.0.4",
-        "source-map": "^0.5.3"
+        "mdn-data": "2.0.6",
+        "source-map": "^0.6.1"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
       }
     },
     "css-unit-converter": {
@@ -6855,9 +6863,9 @@
       "dev": true
     },
     "mdn-data": {
-      "version": "2.0.4",
-      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.0.4.tgz",
-      "integrity": "sha512-iV3XNKw06j5Q7mi6h+9vbx23Tv7JkjEVgKHW4pimwyDGWm0OIQntJJ+u1C6mg6mK1EaTv42XQ7w76yuzH7M2cA==",
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.0.6.tgz",
+      "integrity": "sha512-rQvjv71olwNHgiTbfPZFkJtjNMciWgswYeciZhtvWLO8bmX3TnhyA62I6sTWOyZssWHJJjY6/KiWwqQsWWsqOA==",
       "dev": true
     },
     "mdurl": {
@@ -11098,12 +11106,12 @@
       }
     },
     "stylelint-csstree-validator": {
-      "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/stylelint-csstree-validator/-/stylelint-csstree-validator-1.5.2.tgz",
-      "integrity": "sha512-EweV7qnGyymZ95HYosX+nEi0ummTqxgox8icjp+R5dgaPLkXEWSmwFOrj2jtofkFkUOhm4ZCAO58QnJGTMggwA==",
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/stylelint-csstree-validator/-/stylelint-csstree-validator-1.8.0.tgz",
+      "integrity": "sha512-S9PAu3/HTkRstKOHgD6Bm6pgf2u/u0jwCOFEq4tmnnvlHchL2SGFgifPl4gTDOQwMxcV12WmXMgsn8NH+2ttRw==",
       "dev": true,
       "requires": {
-        "css-tree": "1.0.0-alpha.33"
+        "css-tree": "1.0.0-alpha.38"
       }
     },
     "subarg": {
diff --git a/docs/package.json b/docs/package.json
index 1f3257a3..1c27eb9a 100644
--- a/docs/package.json
+++ b/docs/package.json
@@ -64,7 +64,7 @@
     "remark-preset-lint-recommended": "3.0.3",
     "remark-reference-links": "4.0.4",
     "stylelint": "10.1.0",
-    "stylelint-csstree-validator": "1.5.2",
+    "stylelint-csstree-validator": "1.8.0",
     "tailwindcss": "^1.1.2",
     "textlint": "11.3.1",
     "textlint-rule-alex": "1.3.1",
diff --git a/docs/yarn.lock b/docs/yarn.lock
index 35465bd8..8e253cff 100644
--- a/docs/yarn.lock
+++ b/docs/yarn.lock
@@ -2325,13 +2325,13 @@ css-select@~1.2.0:
     domutils "1.5.1"
     nth-check "~1.0.1"
 
-css-tree@1.0.0-alpha.33:
-  version "1.0.0-alpha.33"
-  resolved "https://registry.yarnpkg.com/css-tree/-/css-tree-1.0.0-alpha.33.tgz#970e20e5a91f7a378ddd0fc58d0b6c8d4f3be93e"
-  integrity sha512-SPt57bh5nQnpsTBsx/IXbO14sRc9xXu5MtMAVuo0BaQQmyf0NupNPPSoMaqiAF5tDFafYsTkfeH4Q/HCKXkg4w==
+css-tree@1.0.0-alpha.38:
+  version "1.0.0-alpha.38"
+  resolved "https://registry.yarnpkg.com/css-tree/-/css-tree-1.0.0-alpha.38.tgz#a75431f4162da84dbdb3c4804e79ad784aa7593c"
+  integrity sha512-pWuxS4kaECFopOc1NZff+dYdw+brc1Tt0UAuTiw56/Trtae4NdHtbDH24311UWfMmcpZe7jLy0e64ZeJg9t7bQ==
   dependencies:
-    mdn-data "2.0.4"
-    source-map "^0.5.3"
+    mdn-data "2.0.6"
+    source-map "^0.6.1"
 
 css-unit-converter@^1.1.1:
   version "1.1.1"
@@ -4811,10 +4811,10 @@ mdast-util-to-string@^1.0.2:
   resolved "https://registry.yarnpkg.com/mdast-util-to-string/-/mdast-util-to-string-1.0.5.tgz#3552b05428af22ceda34f156afe62ec8e6d731ca"
   integrity sha512-2qLt/DEOo5F6nc2VFScQiHPzQ0XXcabquRJxKMhKte8nt42o08HUxNDPk7tt0YPxnWjAT11I1SYi0X0iPnfI5A==
 
-mdn-data@2.0.4:
-  version "2.0.4"
-  resolved "https://registry.yarnpkg.com/mdn-data/-/mdn-data-2.0.4.tgz#699b3c38ac6f1d728091a64650b65d388502fd5b"
-  integrity sha512-iV3XNKw06j5Q7mi6h+9vbx23Tv7JkjEVgKHW4pimwyDGWm0OIQntJJ+u1C6mg6mK1EaTv42XQ7w76yuzH7M2cA==
+mdn-data@2.0.6:
+  version "2.0.6"
+  resolved "https://registry.yarnpkg.com/mdn-data/-/mdn-data-2.0.6.tgz#852dc60fcaa5daa2e8cf6c9189c440ed3e042978"
+  integrity sha512-rQvjv71olwNHgiTbfPZFkJtjNMciWgswYeciZhtvWLO8bmX3TnhyA62I6sTWOyZssWHJJjY6/KiWwqQsWWsqOA==
 
 mdurl@^1.0.1:
   version "1.0.1"
@@ -7742,7 +7742,7 @@ source-map-url@^0.4.0:
   resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.0.tgz#3e935d7ddd73631b97659956d55128e87b5084a3"
   integrity sha1-PpNdfd1zYxuXZZlW1VEo6HtQhKM=
 
-source-map@^0.5.0, source-map@^0.5.3, source-map@^0.5.6, source-map@~0.5.1:
+source-map@^0.5.0, source-map@^0.5.6, source-map@~0.5.1:
   version "0.5.7"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
   integrity sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=
@@ -8050,12 +8050,12 @@ style-search@^0.1.0:
   resolved "https://registry.yarnpkg.com/style-search/-/style-search-0.1.0.tgz#7958c793e47e32e07d2b5cafe5c0bf8e12e77902"
   integrity sha1-eVjHk+R+MuB9K1yv5cC/jhLneQI=
 
-stylelint-csstree-validator@1.5.2:
-  version "1.5.2"
-  resolved "https://registry.yarnpkg.com/stylelint-csstree-validator/-/stylelint-csstree-validator-1.5.2.tgz#31cceacae2a1f22bd2655ca1bd0018fc075e4886"
-  integrity sha512-EweV7qnGyymZ95HYosX+nEi0ummTqxgox8icjp+R5dgaPLkXEWSmwFOrj2jtofkFkUOhm4ZCAO58QnJGTMggwA==
+stylelint-csstree-validator@1.8.0:
+  version "1.8.0"
+  resolved "https://registry.yarnpkg.com/stylelint-csstree-validator/-/stylelint-csstree-validator-1.8.0.tgz#f8e0179ba115b82249344b16f737968dc21cd408"
+  integrity sha512-S9PAu3/HTkRstKOHgD6Bm6pgf2u/u0jwCOFEq4tmnnvlHchL2SGFgifPl4gTDOQwMxcV12WmXMgsn8NH+2ttRw==
   dependencies:
-    css-tree "1.0.0-alpha.33"
+    css-tree "1.0.0-alpha.38"
 
 stylelint@10.1.0:
   version "10.1.0"