diff --git a/.github/workflows/lint-and-fmt.yml b/.github/workflows/lint-and-fmt.yml
index adb1a83..5afaa12 100644
--- a/.github/workflows/lint-and-fmt.yml
+++ b/.github/workflows/lint-and-fmt.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8"]
+        python-version: ["3.9"]
         architecture: ["x64"]
     name: Lint and Format (Python)
     steps:
diff --git a/README.md b/README.md
index b9aee53..264240f 100644
--- a/README.md
+++ b/README.md
@@ -3,11 +3,12 @@
 google-yamlfmt 是一个二次打包 [yamlfmt](https://github.com/google/yamlfmt) 的仓库。
 
 ## 特性
+
 - 可以使用 pip 或任意 python 包管理工具安装
 
 ## 安装
 
-要安装 google-yamlfmt，请确保您的 Python 版本为 3.8 或更高，然后运行以下命令：
+要安装 google-yamlfmt，请确保您的 Python 版本为 3.9 或更高，然后运行以下命令：
 
 ```bash
 pip install google-yamlfmt
diff --git a/pyproject.toml b/pyproject.toml
index 0b7ba2f..fba7884 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ version = "0.16.0-post.1"
 description = "A tool for formatting YAML files, yamlfmt from Google: https://github.com/google/yamlfmt"
 readme = "README.md"
 license = { text = "MIT" }
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = []
 
 [project.urls]
@@ -13,9 +13,7 @@ Repository = "https://github.com/PFCCLab/google-yamlfmt"
 Issues = "https://github.com/PFCCLab/google-yamlfmt/issues"
 
 [dependency-groups]
-dev = [
-    "hatchling>=1.27.0",
-]
+dev = ["hatchling>=1.27.0"]
 
 [project.scripts]
 yamlfmt = "yamlfmt.__main__:main"