diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..d820c31
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Type check
+        run: npx tsc --noEmit
+
+      - name: Lint
+        run: npx eslint . --quiet
+
+      - name: Test
+        run: npm test -- --runInBand
+
+      - name: Build
+        run: npm run build
diff --git a/package-lock.json b/package-lock.json
index 044b664..883b65c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,11 +8,11 @@
             "name": "blog",
             "version": "0.1.0",
             "dependencies": {
-                "gray-matter": "latest",
+                "gray-matter": "4.0.3",
                 "next": "^15.0.3",
                 "prism-react-renderer": "^2.4.0",
-                "react": "latest",
-                "react-dom": "latest",
+                "react": "18.3.1",
+                "react-dom": "18.3.1",
                 "rehype": "^13.0.2",
                 "rehype-katex": "^7.0.1",
                 "rehype-sanitize": "^6.0.0",
@@ -20,32 +20,32 @@
                 "remark": "^15.0.1",
                 "remark-emoji": "^5.0.1",
                 "remark-gfm": "^4.0.0",
-                "remark-html": "latest",
-                "remark-math": "latest",
-                "remark-rehype": "latest",
-                "unified": "latest"
+                "remark-html": "16.0.1",
+                "remark-math": "6.0.0",
+                "remark-rehype": "11.1.1",
+                "unified": "11.0.5"
             },
             "devDependencies": {
-                "@tailwindcss/typography": "latest",
+                "@tailwindcss/typography": "0.5.15",
                 "@testing-library/jest-dom": "^6.9.1",
                 "@testing-library/react": "^16.3.2",
                 "@testing-library/user-event": "^14.6.1",
                 "@types/jest": "^30.0.0",
-                "@types/node": "latest",
-                "@types/react": "latest",
-                "@types/react-dom": "latest",
-                "autoprefixer": "latest",
-                "eslint": "latest",
-                "eslint-config-next": "latest",
+                "@types/node": "20.17.6",
+                "@types/react": "18.3.12",
+                "@types/react-dom": "18.3.1",
+                "autoprefixer": "10.4.20",
+                "eslint": "8.57.1",
+                "eslint-config-next": "14.0.4",
                 "jest": "^30.4.2",
                 "jest-environment-jsdom": "^30.4.1",
                 "node-mocks-http": "^1.17.2",
-                "postcss": "latest",
-                "rimraf": "latest",
-                "tailwindcss": "latest",
+                "postcss": "8.4.49",
+                "rimraf": "5.0.10",
+                "tailwindcss": "3.4.15",
                 "ts-jest": "^29.4.11",
                 "ts-node": "^10.9.2",
-                "typescript": "latest"
+                "typescript": "5.6.3"
             },
             "engines": {
                 "node": "22.x"
diff --git a/package.json b/package.json
index 44ed218..be1d49d 100644
--- a/package.json
+++ b/package.json
@@ -13,11 +13,11 @@
         "clean": "rimraf .next node_modules"
     },
     "dependencies": {
-        "gray-matter": "latest",
+        "gray-matter": "4.0.3",
         "next": "^15.0.3",
         "prism-react-renderer": "^2.4.0",
-        "react": "latest",
-        "react-dom": "latest",
+        "react": "18.3.1",
+        "react-dom": "18.3.1",
         "rehype": "^13.0.2",
         "rehype-katex": "^7.0.1",
         "rehype-sanitize": "^6.0.0",
@@ -25,32 +25,32 @@
         "remark": "^15.0.1",
         "remark-emoji": "^5.0.1",
         "remark-gfm": "^4.0.0",
-        "remark-html": "latest",
-        "remark-math": "latest",
-        "remark-rehype": "latest",
-        "unified": "latest"
+        "remark-html": "16.0.1",
+        "remark-math": "6.0.0",
+        "remark-rehype": "11.1.1",
+        "unified": "11.0.5"
     },
     "devDependencies": {
-        "@tailwindcss/typography": "latest",
+        "@tailwindcss/typography": "0.5.15",
         "@testing-library/jest-dom": "^6.9.1",
         "@testing-library/react": "^16.3.2",
         "@testing-library/user-event": "^14.6.1",
         "@types/jest": "^30.0.0",
-        "@types/node": "latest",
-        "@types/react": "latest",
-        "@types/react-dom": "latest",
-        "autoprefixer": "latest",
-        "eslint": "latest",
-        "eslint-config-next": "latest",
+        "@types/node": "20.17.6",
+        "@types/react": "18.3.12",
+        "@types/react-dom": "18.3.1",
+        "autoprefixer": "10.4.20",
+        "eslint": "8.57.1",
+        "eslint-config-next": "14.0.4",
         "jest": "^30.4.2",
         "jest-environment-jsdom": "^30.4.1",
         "node-mocks-http": "^1.17.2",
-        "postcss": "latest",
-        "rimraf": "latest",
-        "tailwindcss": "latest",
+        "postcss": "8.4.49",
+        "rimraf": "5.0.10",
+        "tailwindcss": "3.4.15",
         "ts-jest": "^29.4.11",
         "ts-node": "^10.9.2",
-        "typescript": "latest"
+        "typescript": "5.6.3"
     },
     "engines": {
         "node": "22.x"
diff --git a/src/pages/api/__tests__/content.test.ts b/src/__tests__/api/content.test.ts
similarity index 98%
rename from src/pages/api/__tests__/content.test.ts
rename to src/__tests__/api/content.test.ts
index 6d0057e..ae76712 100644
--- a/src/pages/api/__tests__/content.test.ts
+++ b/src/__tests__/api/content.test.ts
@@ -7,7 +7,7 @@ jest.mock('fs/promises', () => ({
 }))
 
 import * as fs from 'fs/promises'
-import handler from '../content/[...path]'
+import handler from '../../pages/api/content/[...path]'
 
 const mockStat = fs.stat as jest.Mock
 const mockReadFile = fs.readFile as jest.Mock
diff --git a/vercel.json b/vercel.json
new file mode 100644
index 0000000..9843d26
--- /dev/null
+++ b/vercel.json
@@ -0,0 +1,5 @@
+{
+  "framework": "nextjs",
+  "installCommand": "npm ci",
+  "buildCommand": "npm run build"
+}