diff --git a/package.json b/package.json
index 05395b0e..d1a7b7ac 100644
--- a/package.json
+++ b/package.json
@@ -98,7 +98,7 @@
     "nyc": "12.0.2",
     "sinon": "6.0.0",
     "socket.io-client": "2.1.1",
-    "stylelint": "9.2.1",
+    "stylelint": "9.3.0",
     "stylelint-config-standard": "18.2.0",
     "textcomplete": "0.17.1",
     "undate": "0.3.0",
diff --git a/yarn.lock b/yarn.lock
index 70a90a79..22166f9e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5466,21 +5466,21 @@ postcss-filter-plugins@^2.0.0:
   dependencies:
     postcss "^5.0.4"
 
-postcss-html@^0.23.6:
-  version "0.23.7"
-  resolved "https://registry.yarnpkg.com/postcss-html/-/postcss-html-0.23.7.tgz#47146c15e21b9c00746c40115dcff8270c439f32"
+postcss-html@^0.28.0:
+  version "0.28.0"
+  resolved "https://registry.yarnpkg.com/postcss-html/-/postcss-html-0.28.0.tgz#3dd0f5b5d7f886b8181bf844396d43a7898162cb"
   dependencies:
     htmlparser2 "^3.9.2"
 
-postcss-less@^1.1.5:
-  version "1.1.5"
-  resolved "https://registry.yarnpkg.com/postcss-less/-/postcss-less-1.1.5.tgz#a6f0ce180cf3797eeee1d4adc0e9e6d6db665609"
+postcss-less@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-less/-/postcss-less-2.0.0.tgz#5d190b8e057ca446d60fe2e2587ad791c9029fb8"
   dependencies:
     postcss "^5.2.16"
 
-postcss-markdown@^0.23.6:
-  version "0.23.7"
-  resolved "https://registry.yarnpkg.com/postcss-markdown/-/postcss-markdown-0.23.7.tgz#7e3a398794295c425e51e4f0abdee6d13ad3d134"
+postcss-markdown@^0.28.0:
+  version "0.28.0"
+  resolved "https://registry.yarnpkg.com/postcss-markdown/-/postcss-markdown-0.28.0.tgz#99d1c4e74967af9e9c98acb2e2b66df4b3c6ed86"
   dependencies:
     remark "^9.0.0"
     unist-util-find-all-after "^1.0.2"
@@ -5677,9 +5677,9 @@ postcss-svgo@^2.1.1:
     postcss-value-parser "^3.2.3"
     svgo "^0.7.0"
 
-postcss-syntax@^0.9.0:
-  version "0.9.1"
-  resolved "https://registry.yarnpkg.com/postcss-syntax/-/postcss-syntax-0.9.1.tgz#5dbd90af1631ab8805b8f594bef2c2e8002d3758"
+postcss-syntax@^0.28.0:
+  version "0.28.0"
+  resolved "https://registry.yarnpkg.com/postcss-syntax/-/postcss-syntax-0.28.0.tgz#e17572a7dcf5388f0c9b68232d2dad48fa7f0b12"
 
 postcss-unique-selectors@^2.0.2:
   version "2.0.2"
@@ -6891,9 +6891,9 @@ stylelint-config-standard@18.2.0:
   dependencies:
     stylelint-config-recommended "^2.1.0"
 
-stylelint@9.2.1:
-  version "9.2.1"
-  resolved "https://registry.yarnpkg.com/stylelint/-/stylelint-9.2.1.tgz#fe63c169f6cd3bc81e77f0e3c6443df3267ec211"
+stylelint@9.3.0:
+  version "9.3.0"
+  resolved "https://registry.yarnpkg.com/stylelint/-/stylelint-9.3.0.tgz#fe176e4e421ac10eac1a6b6d9f28e908eb58c5db"
   dependencies:
     autoprefixer "^8.0.0"
     balanced-match "^1.0.0"
@@ -6918,9 +6918,9 @@ stylelint@9.2.1:
     normalize-selector "^0.2.0"
     pify "^3.0.0"
     postcss "^6.0.16"
-    postcss-html "^0.23.6"
-    postcss-less "^1.1.5"
-    postcss-markdown "^0.23.6"
+    postcss-html "^0.28.0"
+    postcss-less "^2.0.0"
+    postcss-markdown "^0.28.0"
     postcss-media-query-parser "^0.2.3"
     postcss-reporter "^5.0.0"
     postcss-resolve-nested-selector "^0.1.1"
@@ -6928,7 +6928,7 @@ stylelint@9.2.1:
     postcss-sass "^0.3.0"
     postcss-scss "^1.0.2"
     postcss-selector-parser "^3.1.0"
-    postcss-syntax "^0.9.0"
+    postcss-syntax "^0.28.0"
     postcss-value-parser "^3.3.0"
     resolve-from "^4.0.0"
     signal-exit "^3.0.2"