diff --git a/package.json b/package.json
index 43fedae9..80c85eb8 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
     "eslint": "9.39.0",
     "eslint-config-hyoban": "4.0.10",
     "lint-staged": "16.2.6",
-    "postcss": "8.5.6",
+    "postcss": "8.5.23",
     "postcss-import": "16.1.1",
     "prettier": "3.6.2",
     "simple-git-hooks": "2.13.1",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 19094640..c4f0db1a 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -146,7 +146,7 @@ importers:
         version: 5.1.0(vite@7.1.12(@types/node@24.9.2)(jiti@2.6.1)(lightningcss@1.30.2)(tsx@4.19.4)(yaml@2.8.1))
       autoprefixer:
         specifier: 10.4.21
-        version: 10.4.21(postcss@8.5.6)
+        version: 10.4.21(postcss@8.5.23)
       code-inspector-plugin:
         specifier: 1.2.10
         version: 1.2.10
@@ -160,11 +160,11 @@ importers:
         specifier: 16.2.6
         version: 16.2.6
       postcss:
-        specifier: 8.5.6
-        version: 8.5.6
+        specifier: 8.5.23
+        version: 8.5.23
       postcss-import:
         specifier: 16.1.1
-        version: 16.1.1(postcss@8.5.6)
+        version: 16.1.1(postcss@8.5.23)
       prettier:
         specifier: 3.6.2
         version: 3.6.2
@@ -2794,6 +2794,7 @@ packages:
   eslint@9.39.0:
     resolution: {integrity: sha512-iy2GE3MHrYTL5lrCtMZ0X1KLEKKUjmK0kzwcnefhR66txcEmXZD2YWgR5GNdcEwkNx3a0siYkSvl0vIC+Svjmg==}
     engines: {node: ^18.18.0 || ^20.9.0 || >=21.1.0}
+    deprecated: This version is no longer supported. Please see https://eslint.org/version-support for other options.
     hasBin: true
     peerDependencies:
       jiti: '*'
@@ -2965,7 +2966,7 @@ packages:
 
   glob@7.2.3:
     resolution: {integrity: sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==}
-    deprecated: Glob versions prior to v9 are no longer supported
+    deprecated: Old versions of glob are not supported, and contain widely publicized security vulnerabilities, which have been fixed in the current version. Please update. Support for old versions may be purchased (at exorbitant rates) by contacting i@izs.me
 
   globals@11.12.0:
     resolution: {integrity: sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==}
@@ -3353,8 +3354,8 @@ packages:
     resolution: {integrity: sha512-tacvGzUY5o2D8CBh2rrwxyNojUsZNU2zjNTzKQrkgGJQTbGAfArVWXSKMBokBeeg6C7OLRGUEyoFlYbfeWQIqw==}
     engines: {node: '>=20.17'}
 
-  nanoid@3.3.11:
-    resolution: {integrity: sha512-N8SpfPUnUp1bK+PMYW8qSWdl9U+wwNWI4QKxOYDy9JAro3WMX7p2OeVRF9v+347pnakNevPmiHhNmZ2HbFA76w==}
+  nanoid@3.3.20:
+    resolution: {integrity: sha512-uKdg2G3GNCKQn9byYOpxbGqrT2fGO5KRt5J/8b3pok8rT6qxGWF6hxMyJiEYtAf+FVyYuD9hRaDqX5uPFYJ4ZQ==}
     engines: {node: ^10 || ^12 || ^13.7 || ^14 || >=15.0.1}
     hasBin: true
 
@@ -3519,8 +3520,8 @@ packages:
   postcss-value-parser@4.2.0:
     resolution: {integrity: sha512-1NNCs6uurfkVbeXG4S8JFT9t19m45ICnif8zWLd5oPSZ50QnwMfK+H3jv408d4jw/7Bttv5axS5IiHoLaVNHeQ==}
 
-  postcss@8.5.6:
-    resolution: {integrity: sha512-3Ybi1tAuwAP9s0r1UQ2J4n5Y0G05bJkpUIO0/bI9MhwmD70S5aTWbXGBwxHrelT+XM1k6dM0pk+SwNkpTRN7Pg==}
+  postcss@8.5.23:
+    resolution: {integrity: sha512-g50586zr4bZmwFiTlflMu8E0bDTb5I5gertgwAKmsdUlTQIhZtunzUlD1WSzwcVWPoAVpsrA6vlfCD7oXvRwgg==}
     engines: {node: ^10 || ^12 || >=14}
 
   preact@10.26.8:
@@ -3977,6 +3978,7 @@ packages:
   tsconfck@3.1.6:
     resolution: {integrity: sha512-ks6Vjr/jEw0P1gmOVwutM3B7fWxoWBL2KRDb1JfqGVawBmO5UsvmWOQFGHBPl5yxYz4eERr19E6L7NMv+Fej4w==}
     engines: {node: ^18 || >=20}
+    deprecated: unmaintained
     hasBin: true
     peerDependencies:
       typescript: ^5.0.0
@@ -6109,7 +6111,7 @@ snapshots:
       '@alloc/quick-lru': 5.2.0
       '@tailwindcss/node': 4.1.16
       '@tailwindcss/oxide': 4.1.16
-      postcss: 8.5.6
+      postcss: 8.5.23
       tailwindcss: 4.1.16
 
   '@tailwindcss/typography@0.5.19(tailwindcss@4.1.16)':
@@ -6469,14 +6471,14 @@ snapshots:
       autocorrect-node-linux-x64-musl: 2.14.0
       autocorrect-node-win32-x64-msvc: 2.14.0
 
-  autoprefixer@10.4.21(postcss@8.5.6):
+  autoprefixer@10.4.21(postcss@8.5.23):
     dependencies:
       browserslist: 4.25.0
       caniuse-lite: 1.0.30001721
       fraction.js: 4.3.7
       normalize-range: 0.1.2
       picocolors: 1.1.1
-      postcss: 8.5.6
+      postcss: 8.5.23
       postcss-value-parser: 4.2.0
 
   balanced-match@1.0.2: {}
@@ -7038,7 +7040,7 @@ snapshots:
   eslint-plugin-tailwindcss@4.0.0-beta.0(tailwindcss@4.1.16):
     dependencies:
       fast-glob: 3.3.3
-      postcss: 8.5.6
+      postcss: 8.5.23
       synckit: 0.11.11
       tailwind-api-utils: 1.0.3(tailwindcss@4.1.16)
       tailwindcss: 4.1.16
@@ -7591,7 +7593,7 @@ snapshots:
 
   nano-spawn@2.0.0: {}
 
-  nanoid@3.3.11: {}
+  nanoid@3.3.20: {}
 
   napi-postinstall@0.3.4: {}
 
@@ -7735,9 +7737,9 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
-  postcss-import@16.1.1(postcss@8.5.6):
+  postcss-import@16.1.1(postcss@8.5.23):
     dependencies:
-      postcss: 8.5.6
+      postcss: 8.5.23
       postcss-value-parser: 4.2.0
       read-cache: 1.0.0
       resolve: 1.22.10
@@ -7749,9 +7751,9 @@ snapshots:
 
   postcss-value-parser@4.2.0: {}
 
-  postcss@8.5.6:
+  postcss@8.5.23:
     dependencies:
-      nanoid: 3.3.11
+      nanoid: 3.3.20
       picocolors: 1.1.1
       source-map-js: 1.2.1
 
@@ -8361,7 +8363,7 @@ snapshots:
       esbuild: 0.25.12
       fdir: 6.5.0(picomatch@4.0.3)
       picomatch: 4.0.3
-      postcss: 8.5.6
+      postcss: 8.5.23
       rollup: 4.52.5
       tinyglobby: 0.2.15
     optionalDependencies: