diff --git a/package.json b/package.json
index d893e83a610..c86eba5f301 100644
--- a/package.json
+++ b/package.json
@@ -118,7 +118,7 @@
     "match-json": "1.3.3",
     "normalize.css": "8.0.1",
     "nyc": "15.1.0",
-    "postcss-nested": "5.0.5",
+    "postcss-nested": "5.0.6",
     "prettier": "2.3.2",
     "qunit": "2.16.0",
     "qunit-console-grouper": "0.3.0",
diff --git a/yarn.lock b/yarn.lock
index 717d946a9bc..57e81adc769 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -12023,12 +12023,12 @@ postcss-modules-values@^4.0.0:
   dependencies:
     icss-utils "^5.0.0"
 
-postcss-nested@5.0.5:
-  version "5.0.5"
-  resolved "https://registry.yarnpkg.com/postcss-nested/-/postcss-nested-5.0.5.tgz#f0a107d33a9fab11d7637205f5321e27223e3603"
-  integrity sha512-GSRXYz5bccobpTzLQZXOnSOfKl6TwVr5CyAQJUPub4nuRJSOECK5AqurxVgmtxP48p0Kc/ndY/YyS1yqldX0Ew==
+postcss-nested@5.0.6:
+  version "5.0.6"
+  resolved "https://registry.yarnpkg.com/postcss-nested/-/postcss-nested-5.0.6.tgz#466343f7fc8d3d46af3e7dba3fcd47d052a945bc"
+  integrity sha512-rKqm2Fk0KbA8Vt3AdGN0FB9OBOMDVajMG6ZCf/GoHgdxUJ4sBFp0A/uMIRm+MJUdo33YXEtjqIz8u7DAp8B7DA==
   dependencies:
-    postcss-selector-parser "^6.0.4"
+    postcss-selector-parser "^6.0.6"
 
 postcss-nesting@^7.0.0:
   version "7.0.1"
@@ -12142,7 +12142,7 @@ postcss-selector-parser@^5.0.0-rc.3, postcss-selector-parser@^5.0.0-rc.4:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
-postcss-selector-parser@^6.0.2, postcss-selector-parser@^6.0.4:
+postcss-selector-parser@^6.0.2, postcss-selector-parser@^6.0.4, postcss-selector-parser@^6.0.6:
   version "6.0.6"
   resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-6.0.6.tgz#2c5bba8174ac2f6981ab631a42ab0ee54af332ea"
   integrity sha512-9LXrvaaX3+mcv5xkg5kFwqSzSH1JIObIx51PrndZwlmznwXRfxMddDvo9gve3gVR8ZTKgoFDdWkbRFmEhT4PMg==