diff --git a/ghost/core/package.json b/ghost/core/package.json
index 8e7ab0414e..dffdb6deff 100644
--- a/ghost/core/package.json
+++ b/ghost/core/package.json
@@ -206,7 +206,7 @@
     "mock-knex": "TryGhost/mock-knex#8ecb8c227bf463c991c3d820d33f59efc3ab9682",
     "nock": "13.2.9",
     "papaparse": "5.3.2",
-    "postcss": "8.4.16",
+    "postcss": "8.4.17",
     "postcss-cli": "10.0.0",
     "rewire": "6.0.0",
     "should": "13.2.3",
diff --git a/yarn.lock b/yarn.lock
index ac20cbabd7..b618557aa3 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -19368,10 +19368,10 @@ postcss-values-parser@^4.0.0:
     is-url-superb "^4.0.0"
     postcss "^7.0.5"
 
-postcss@8.4.16, postcss@^8.1.4, postcss@^8.2.15, postcss@^8.3.11:
-  version "8.4.16"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.16.tgz#33a1d675fac39941f5f445db0de4db2b6e01d43c"
-  integrity sha512-ipHE1XBvKzm5xI7hiHCZJCSugxvsdq2mPnsq5+UF+VHCjiBvtDrlxJfMBToWaP9D5XlgNmcFGqoHmUn0EYEaRQ==
+postcss@8.4.17, postcss@^8.1.4, postcss@^8.2.15, postcss@^8.3.11:
+  version "8.4.17"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.17.tgz#f87863ec7cd353f81f7ab2dec5d67d861bbb1be5"
+  integrity sha512-UNxNOLQydcOFi41yHNMcKRZ39NeXlr8AxGuZJsdub8vIb12fHzcq37DTU/QtbI6WLxNg2gF9Z+8qtRwTj1UI1Q==
   dependencies:
     nanoid "^3.3.4"
     picocolors "^1.0.0"