diff --git a/package.json b/package.json
index fef2eb9bb..60deb0536 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "postcss-functions": "^3.0.0",
     "postcss-js": "^2.0.0",
     "postcss-nested": "^4.1.1",
-    "postcss-selector-parser": "^5.0.0",
+    "postcss-selector-parser": "^6.0.0",
     "pretty-hrtime": "^1.0.3",
     "strip-comments": "^1.0.2"
   },
diff --git a/yarn.lock b/yarn.lock
index d5f3fe64c..9b2ac816d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1491,6 +1491,11 @@ cssesc@^2.0.0:
   resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-2.0.0.tgz#3b13bd1bb1cb36e1bcb5a4dcd27f54c5dcb35703"
   integrity sha512-MsCAG1z9lPdoO/IUMLSBWBSVxVtJ1395VGIQ+Fc2gNdkQ1hNDnQdw3YhA71WJCBW1vdwA0cAnk/DnW6bqoEUYg==
 
+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@0.3.x, "cssom@>= 0.3.2 < 0.4.0":
   version "0.3.2"
   resolved "https://registry.yarnpkg.com/cssom/-/cssom-0.3.2.tgz#b8036170c79f07a90ff2f16e22284027a243848b"
@@ -4031,7 +4036,7 @@ postcss-scss@^0.3.0:
   dependencies:
     postcss "^5.2.4"
 
-postcss-selector-parser@^5.0.0, postcss-selector-parser@^5.0.0-rc.4:
+postcss-selector-parser@^5.0.0-rc.4:
   version "5.0.0"
   resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-5.0.0.tgz#249044356697b33b64f1a8f7c80922dddee7195c"
   integrity sha512-w+zLE5Jhg6Liz8+rQOWEAwtwkyqpfnmsinXjXg6cY7YIONZZtgvE0v2O0uhQBs0peNomOJwWRKt6JBfTdTd3OQ==
@@ -4040,6 +4045,15 @@ postcss-selector-parser@^5.0.0, postcss-selector-parser@^5.0.0-rc.4:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
+postcss-selector-parser@^6.0.0:
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-6.0.0.tgz#5cf920dae70589adf1aba7ec72e39cc882e5cf40"
+  integrity sha512-E4EHwWgh5NIh/F44hYfQHR1jwejCza1ktpeWTetDtc71hxdDmWPjfSs28/58DBDIKxz5Dxlw8oW6am2ph/OCkg==
+  dependencies:
+    cssesc "^3.0.0"
+    indexes-of "^1.0.1"
+    uniq "^1.0.1"
+
 postcss-value-parser@^3.3.0:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-3.3.0.tgz#87f38f9f18f774a4ab4c8a232f5c5ce8872a9d15"