diff --git a/.eslintrc.js b/.eslintrc.js
deleted file mode 100644
index 7ed2f5b8..00000000
--- a/.eslintrc.js
+++ /dev/null
@@ -1,12 +0,0 @@
-/** @type {import("eslint").Linter.Config} */
-module.exports = {
-  extends: ["airbnb-typescript-prettier"],
-  rules: {
-    // for-of 構文を使いたい
-    "no-restricted-syntax": "off",
-    // TypeScript と相性が悪い
-    "react/require-default-props": "off",
-    "react/jsx-props-no-spreading": "off",
-  },
-  ignorePatterns: ["/public/**"],
-};
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index a2ecea20..84961e89 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -5,17 +5,23 @@ jobs:
     name: Check
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: oven-sh/setup-bun@v2
         with:
           bun-version: "1.2.4"
       - run: bun install --frozen-lockfile
       - run: bun check
+  typos:
+    name: Check Typos
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: crate-ci/typos@v1
   build:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: oven-sh/setup-bun@v2
         with:
           bun-version: "1.2.4"
diff --git a/.helix/languages.toml b/.helix/languages.toml
index a1baf64a..481e73a5 100644
--- a/.helix/languages.toml
+++ b/.helix/languages.toml
@@ -1,5 +1,7 @@
-[language-servers]
-astro-ls = { command = "astro-ls", args = ["--stdio"] }
+[language-servers.astro-ls]
+command = "astro-ls"
+args = ["--stdio"]
+config = { contentIntellisense = true } # not working?
 
 [[language]]
 name = "astro"
@@ -14,3 +16,8 @@ formatter = { command = "bun", args = ["prettier", "--parser", "typescript"] }
 name = "svelte"
 formatter = { command = "bun", args = ["prettier", "--parser", "svelte"] }
 auto-format = true
+
+[[language]]
+name = "markdown"
+file-types = ["md", "mdx"]
+language-servers = ["astro-ls"]
diff --git a/.nvmrc b/.nvmrc
deleted file mode 100644
index 3c032078..00000000
--- a/.nvmrc
+++ /dev/null
@@ -1 +0,0 @@
-18
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
index 30810fab..9a8a6908 100644
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -1,3 +1,3 @@
 {
-  "recommendations": ["astro-build.astro-vscode"]
+  "recommendations": ["astro-build.astro-vscode", "tekumara.typos-vscode"]
 }
diff --git a/README.md b/README.md
index 4bc646f1..e85d6b03 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,8 @@
 ### ローカル
 
 - (必須) Bun >= v1.1.39
-- 任意のエディタ https://docs.astro.build/en/editor-setup/
+- (推奨) Typos <https://github.com/crate-ci/typos>
+- 任意のエディタ <https://docs.astro.build/en/editor-setup/>
 
 ```sh
 bun install --frozen-lockfile
diff --git a/_typos.toml b/_typos.toml
new file mode 100644
index 00000000..454089ba
--- /dev/null
+++ b/_typos.toml
@@ -0,0 +1,2 @@
+[default.extend-words]
+progate = "progate"
diff --git a/lefthook.yml b/lefthook.yml
index 4bab75ca..e81fce92 100644
--- a/lefthook.yml
+++ b/lefthook.yml
@@ -10,3 +10,5 @@ pre-commit:
       stage_fixed: true
     sync:
       run: bun sync
+    typos:
+      run: if command -v typos 2&> /dev/null; then typos; fi
diff --git a/package.json b/package.json
index f2590021..3ce3969d 100644
--- a/package.json
+++ b/package.json
@@ -1,14 +1,14 @@
 {
   "name": "website",
-  "version": "3.1.0",
-  "private": true,
+  "homepage": "https://utcode.net",
   "description": "website of ut.code();, version 3",
-  "author": "aster-void and others",
-  "type": "module",
+  "private": true,
+  "version": "3.1.1",
   "keywords": [
     "astro",
     "ut.code();"
   ],
+  "type": "module",
   "scripts": {
     "prepare": "lefthook install && bun sync",
     "sync": "astro sync",
diff --git a/shell.nix b/shell.nix
index 43db9070..34939c29 100644
--- a/shell.nix
+++ b/shell.nix
@@ -3,6 +3,9 @@ pkgs.mkShell {
   packages = [
     pkgs.bun
     pkgs.biome
+    pkgs.astro-language-server
     pkgs.nodejs-slim # required by astro to find sharp
+    pkgs.typos
+    pkgs.typos-lsp
   ];
 }
diff --git a/src/schema.ts b/src/schema.ts
index f1d2541e..74cf70f9 100644
--- a/src/schema.ts
+++ b/src/schema.ts
@@ -8,8 +8,6 @@ export type Project = z.infer<ReturnType<typeof CreateProjectSchema>>;
 
 export const CreateArticleSchema = ({ image }: { image: ImageFunction }) =>
   z.object({
-    // excerpt: z.string().nullable(),
-    // longExcerpt: z.string().nullable(),
     date: z
       .date()
       .transform((date) => new TZDate(date).withTimeZone("Asia/Tokyo")),
diff --git a/tsconfig.json b/tsconfig.json
index 5a89c962..2c3da799 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -20,5 +20,5 @@
     }
   },
   "include": [".astro/types.d.ts", "**/*"],
-  "exclude": ["dist"]
+  "exclude": ["dist", ".direnv"]
 }