diff --git a/.github/workflows/linter.yml b/.github/workflows/linter.yml
index 6dc94c7..f22e260 100644
--- a/.github/workflows/linter.yml
+++ b/.github/workflows/linter.yml
@@ -6,11 +6,11 @@ jobs:
   linter:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - name: Use Node.js 14.x
-        uses: actions/setup-node@v2
+      - uses: actions/checkout@v4
+      - name: Use Node.js 18
+        uses: actions/setup-node@v4
         with:
-          node-version: '14.x'
+          node-version: "18"
       - name: Install Dependencies
         run: npm install
       - name: Lint
diff --git a/.github/workflows/tester.yml b/.github/workflows/tester.yml
index 55f32f4..1ad5b56 100644
--- a/.github/workflows/tester.yml
+++ b/.github/workflows/tester.yml
@@ -8,12 +8,12 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        node-version: ['14.x', '16.x', '18.x']
+        node-version: [18, 20]
       fail-fast: false
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
       - name: Install Dependencies
@@ -27,11 +27,11 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        node-version: ['14.x']
+        node-version: [18]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
       - name: Install Dependencies
@@ -41,6 +41,6 @@ jobs:
         env:
           CI: true
       - name: Coveralls
-        uses: coverallsapp/github-action@master
+        uses: coverallsapp/github-action@v2
         with:
           github-token: ${{ secrets.github_token }}
diff --git a/README.md b/README.md
index c09e0d6..6e31363 100644
--- a/README.md
+++ b/README.md
@@ -10,32 +10,32 @@ It generates an archive of posts on your homepage, according to the `index` or `
 
 ## Installation
 
-``` bash
-$ npm install hexo-generator-index --save
+```bash
+npm install hexo-generator-index --save
 ```
 
 ## Options
 
-Add or modify the following section to your root _config.yml file
+Add or modify the following section to your root `_config.yml` file.
 
-``` yaml
+```yaml
 index_generator:
-  path: ''
+  path: ""
   per_page: 10
   order_by: -date
   pagination_dir: page
 ```
 
-- **path**: Root path for your blog's index page. 
-  - default: ""
+- **path**: Root path for your blog's index page.
+  - default: `""`
 - **per_page**: Posts displayed per page.
   - default: [`config.per_page`](https://hexo.io/docs/configuration.html#Pagination) as specified in the official Hexo docs (if present), otherwise `10`
-  - `0` disables pagination
-- **order_by**: Posts order. 
-  - default: date descending
+  - `0` disables pagination.
+- **order_by**: Posts order.
+  - default: `-date` (date descending)
 - **pagination_dir**: URL format.
-  - default: 'page'
-  - `awesome-page` makes the URL ends with 'awesome-page/<page number>' for second page and beyond.
+  - default: `page`
+  - e.g. set `awesome-page` makes the URL ends with `awesome-page/<page number>` for second page and beyond.
 
 ## Usage
 
diff --git a/package.json b/package.json
index 07ec387..fd4dfd2 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "lib/"
   ],
   "engines": {
-    "node": ">=14"
+    "node": ">=18"
   },
   "repository": "hexojs/hexo-generator-index",
   "homepage": "https://hexo.io/",
@@ -29,7 +29,7 @@
   "author": "Tommy Chen <tommy351@gmail.com> (https://zespia.tw)",
   "license": "MIT",
   "devDependencies": {
-    "c8": "^9.0.0",
+    "c8": "^10.1.2",
     "chai": "^4.3.6",
     "eslint": "^8.25.0",
     "eslint-config-hexo": "^5.0.0",
diff --git a/test/index.js b/test/index.js
index e029211..a07c515 100644
--- a/test/index.js
+++ b/test/index.js
@@ -11,10 +11,14 @@ describe('Index generator', () => {
     locals;
 
   // Default config
-  hexo.config.index_generator = {
+  const default_index_generator = Object.freeze({
     per_page: 10,
     order_by: '-date'
-  };
+  });
+
+  beforeEach(() => {
+    hexo.config.index_generator = {...default_index_generator};
+  });
 
   before(() => hexo.init().then(() => Post.insert([
     {source: 'foo', slug: 'foo', date: 1e8, order: 0},
@@ -57,8 +61,6 @@ describe('Index generator', () => {
     result[1].data.next_link.should.eql('');
     result[1].data.__index.should.be.true;
 
-    // Restore config
-    hexo.config.index_generator.per_page = 10;
   });
 
   it('pagination disabled', () => {
@@ -81,8 +83,6 @@ describe('Index generator', () => {
     result[0].data.next_link.should.eql('');
     result[0].data.__index.should.be.true;
 
-    // Restore config
-    hexo.config.index_generator.per_page = 10;
   });
 
   describe('order', () => {
@@ -109,8 +109,6 @@ describe('Index generator', () => {
       result[0].data.posts.eq(1).source.should.eql('baz');
       result[0].data.posts.eq(2).source.should.eql('bar');
 
-      // Restore config
-      delete hexo.config.index_generator.order_by;
     });
 
     it('custom order - invalid order key', () => {
@@ -122,8 +120,6 @@ describe('Index generator', () => {
       result[0].data.posts.eq(1).source.should.eql('bar');
       result[0].data.posts.eq(2).source.should.eql('baz');
 
-      // Restore config
-      delete hexo.config.index_generator.order_by;
     });
   });
 
@@ -137,9 +133,6 @@ describe('Index generator', () => {
     result[1].path.should.eql('yo/2/');
     result[2].path.should.eql('yo/3/');
 
-    // Restore config
-    hexo.config.index_generator.per_page = 10;
-    hexo.config.pagination_dir = 'page';
   });
 
   it('custom pagination_dir - plugin setting', () => {
@@ -156,5 +149,4 @@ describe('Index generator', () => {
     hexo.config.index_generator.per_page = 10;
     hexo.config.index_generator.pagination_dir = 'page';
   });
-
 });