diff --git a/ghost/admin/package.json b/ghost/admin/package.json
index 7a24d7d8ba..9564d65199 100644
--- a/ghost/admin/package.json
+++ b/ghost/admin/package.json
@@ -117,7 +117,7 @@
     "normalize.css": "3.0.3",
     "postcss-color-mod-function": "3.0.3",
     "postcss-custom-media": "7.0.8",
-    "postcss-custom-properties": "8.0.10",
+    "postcss-custom-properties": "8.0.11",
     "postcss-easy-import": "3.0.0",
     "reframe.js": "2.2.5",
     "simplemde": "https://github.com/kevinansfield/simplemde-markdown-editor.git#ghost",
diff --git a/ghost/admin/yarn.lock b/ghost/admin/yarn.lock
index 4088c8387d..2ebcbb217a 100644
--- a/ghost/admin/yarn.lock
+++ b/ghost/admin/yarn.lock
@@ -9414,12 +9414,12 @@ postcss-custom-media@7.0.8:
   dependencies:
     postcss "^7.0.14"
 
-postcss-custom-properties@8.0.10:
-  version "8.0.10"
-  resolved "https://registry.yarnpkg.com/postcss-custom-properties/-/postcss-custom-properties-8.0.10.tgz#e8dc969e1e15c555f0b836b7f278ef47e3cdeaff"
-  integrity sha512-GDL0dyd7++goDR4SSasYdRNNvp4Gqy1XMzcCnTijiph7VB27XXpJ8bW/AI0i2VSBZ55TpdGhMr37kMSpRfYD0Q==
+postcss-custom-properties@8.0.11:
+  version "8.0.11"
+  resolved "https://registry.yarnpkg.com/postcss-custom-properties/-/postcss-custom-properties-8.0.11.tgz#2d61772d6e92f22f5e0d52602df8fae46fa30d97"
+  integrity sha512-nm+o0eLdYqdnJ5abAJeXp4CEU1c1k+eB2yMCvhgzsds/e0umabFrN6HoTy/8Q4K5ilxERdl/JD1LO5ANoYBeMA==
   dependencies:
-    postcss "^7.0.14"
+    postcss "^7.0.17"
     postcss-values-parser "^2.0.1"
 
 postcss-discard-comments@^4.0.2:
@@ -9707,7 +9707,7 @@ postcss@^6.0.1, postcss@^6.0.11:
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
-postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.16, postcss@^7.0.2, postcss@^7.0.5:
+postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.16, postcss@^7.0.17, postcss@^7.0.2, postcss@^7.0.5:
   version "7.0.17"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.17.tgz#4da1bdff5322d4a0acaab4d87f3e782436bad31f"
   integrity sha512-546ZowA+KZ3OasvQZHsbuEpysvwTZNGJv9EfyCQdsIDltPSWHAeTQ5fQy/Npi2ZDtLI3zs7Ps/p6wThErhm9fQ==