diff --git a/modules/st2-style/package.json b/modules/st2-style/package.json
index 17a95f26e..163c35f51 100644
--- a/modules/st2-style/package.json
+++ b/modules/st2-style/package.json
@@ -50,7 +50,7 @@
     "babelify": "10.0.0",
     "postcss": "7.0.14",
     "postcss-import": "12.0.1",
-    "postcss-nested": "4.1.2",
+    "postcss-nested": "4.2.3",
     "postcss-preset-env": "6.6.0"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index bf35a3e84..802937fe9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2389,6 +2389,11 @@ 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==
+
 cssify@^1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/cssify/-/cssify-1.0.3.tgz#7e9cdf6b2fc60859626d293a6a8fb22aea1aa308"
@@ -6834,13 +6839,13 @@ postcss-modules-values@1.3.0:
     icss-replace-symbols "^1.1.0"
     postcss "^6.0.1"
 
-postcss-nested@4.1.2:
-  version "4.1.2"
-  resolved "https://registry.yarnpkg.com/postcss-nested/-/postcss-nested-4.1.2.tgz#8e0570f736bfb4be5136e31901bf2380b819a561"
-  integrity sha512-9bQFr2TezohU3KRSu9f6sfecXmf/x6RXDedl8CHF6fyuyVW7UqgNMRdWMHZQWuFY6Xqs2NYk+Fj4Z4vSOf7PQg==
+postcss-nested@4.2.3:
+  version "4.2.3"
+  resolved "https://registry.yarnpkg.com/postcss-nested/-/postcss-nested-4.2.3.tgz#c6f255b0a720549776d220d00c4b70cd244136f6"
+  integrity sha512-rOv0W1HquRCamWy2kFl3QazJMMe1ku6rCFoAAH+9AcxdbpDeBr6k968MLWuLjvjMcGEip01ak09hKOEgpK9hvw==
   dependencies:
-    postcss "^7.0.14"
-    postcss-selector-parser "^5.0.0"
+    postcss "^7.0.32"
+    postcss-selector-parser "^6.0.2"
 
 postcss-nesting@^7.0.0:
   version "7.0.0"
@@ -6954,6 +6959,15 @@ postcss-selector-parser@^5.0.0, postcss-selector-parser@^5.0.0-rc.3, postcss-sel
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
+postcss-selector-parser@^6.0.2:
+  version "6.0.2"
+  resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-6.0.2.tgz#934cf799d016c83411859e09dcecade01286ec5c"
+  integrity sha512-36P2QR59jDTOAiIkqEprfJDsoNrvwFei3eCqKd1Y0tUsBimsq39BLp7RD+JWny3WgB1zGhJX8XVePwm9k4wdBg==
+  dependencies:
+    cssesc "^3.0.0"
+    indexes-of "^1.0.1"
+    uniq "^1.0.1"
+
 postcss-value-parser@^3.2.3, postcss-value-parser@^3.3.1:
   version "3.3.1"
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-3.3.1.tgz#9ff822547e2893213cf1c30efa51ac5fd1ba8281"
@@ -6995,6 +7009,15 @@ postcss@^6.0.1, postcss@^6.0.12:
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
+postcss@^7.0.32:
+  version "7.0.32"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.32.tgz#4310d6ee347053da3433db2be492883d62cec59d"
+  integrity sha512-03eXong5NLnNCD05xscnGKGDZ98CyzoqPSMjOe6SuoQY7Z2hIj0Ld1g/O/UQRuOle2aRtiIRDg9tDcTGAkLfKw==
+  dependencies:
+    chalk "^2.4.2"
+    source-map "^0.6.1"
+    supports-color "^6.1.0"
+
 prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"