diff --git a/package.json b/package.json
index be4a5ec0db4c..e9b799eb3b04 100644
--- a/package.json
+++ b/package.json
@@ -70,7 +70,7 @@
     "postcss-less": "3.1.4",
     "postcss-media-query-parser": "0.2.3",
     "postcss-scss": "2.1.1",
-    "postcss-selector-parser": "2.2.3",
+    "postcss-selector-parser": "6.0.10",
     "postcss-values-parser": "2.0.1",
     "regexp-util": "1.2.2",
     "remark-footnotes": "2.0.0",
diff --git a/yarn.lock b/yarn.lock
index 95fe6a7ff2eb..48a8a0fe8e21 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2576,6 +2576,11 @@ cspell@5.16.0:
     strip-ansi "^6.0.1"
     vscode-uri "^3.0.3"
 
+cssesc@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-3.0.0.tgz#37741919903b868565e1c09ea747445cd18983ee"
+  integrity sha512-/Tb/JcjK111nNScGob5MNtsntNM1aCNUDipB/TkwZFhyDrrE47SOx/18wF2bbjgc3ZzCSKW1T5nt5EbFoAz/Vg==
+
 cssom@^0.4.4:
   version "0.4.4"
   resolved "https://registry.yarnpkg.com/cssom/-/cssom-0.4.4.tgz#5a66cf93d2d0b661d80bf6a44fb65f5c2e4e0a10"
@@ -5435,14 +5440,13 @@ postcss-scss@2.1.1:
   dependencies:
     postcss "^7.0.6"
 
-postcss-selector-parser@2.2.3:
-  version "2.2.3"
-  resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-2.2.3.tgz#f9437788606c3c9acee16ffe8d8b16297f27bb90"
-  integrity sha1-+UN3iGBsPJrO4W/+jYsWKX8nu5A=
+postcss-selector-parser@6.0.10:
+  version "6.0.10"
+  resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-6.0.10.tgz#79b61e2c0d1bfc2602d549e11d0876256f8df88d"
+  integrity sha512-IQ7TZdoaqbT+LCpShg46jnZVlhWD2w6iQYAcYXfHARZ7X1t/UGhhceQDs5X0cGqKvYlHNOuv7Oa1xmb0oQuA3w==
   dependencies:
-    flatten "^1.0.2"
-    indexes-of "^1.0.1"
-    uniq "^1.0.1"
+    cssesc "^3.0.0"
+    util-deprecate "^1.0.2"
 
 postcss-values-parser@2.0.1:
   version "2.0.1"
@@ -6541,6 +6545,11 @@ uri-js@^4.2.2:
   dependencies:
     punycode "^2.1.0"
 
+util-deprecate@^1.0.2:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
+  integrity sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=
+
 v8-compile-cache@^2.0.3:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/v8-compile-cache/-/v8-compile-cache-2.3.0.tgz#2de19618c66dc247dcfb6f99338035d8245a2cee"