diff --git a/rails/package.json b/rails/package.json
index 7d88c9ee..6e806408 100644
--- a/rails/package.json
+++ b/rails/package.json
@@ -11,7 +11,7 @@
     "@tailwindcss/postcss7-compat": "^2.0.4",
     "autoprefixer": "^9",
     "jquery": "^3.4.1",
-    "postcss": "^7",
+    "postcss": "^8",
     "tailwindcss": "npm:@tailwindcss/postcss7-compat",
     "trix": "^1.0.0",
     "turbolinks": "^5.2.0"
diff --git a/rails/yarn.lock b/rails/yarn.lock
index e7cf56a4..e31911b1 100644
--- a/rails/yarn.lock
+++ b/rails/yarn.lock
@@ -6201,6 +6201,15 @@ postcss@^7, postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.17, po
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
+postcss@^8:
+  version "8.2.10"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.10.tgz#ca7a042aa8aff494b334d0ff3e9e77079f6f702b"
+  integrity sha512-b/h7CPV7QEdrqIxtAf2j31U5ef05uBDuvoXv6L51Q4rcS1jdlXAVKJv+atCFdUXYl9dyTHGyoMzIepwowRJjFw==
+  dependencies:
+    colorette "^1.2.2"
+    nanoid "^3.1.22"
+    source-map "^0.6.1"
+
 postcss@^8.2.1:
   version "8.2.13"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.13.tgz#dbe043e26e3c068e45113b1ed6375d2d37e2129f"