diff --git a/.github/workflows/pre_commit.yml b/.github/workflows/pre_commit.yml
index d203cee..aa92e2f 100644
--- a/.github/workflows/pre_commit.yml
+++ b/.github/workflows/pre_commit.yml
@@ -1,9 +1,6 @@
 name: Lint
 
-on:
-  push:
-    branches:
-      - main
+on: pull_request
 
 jobs:
   pre_commit:
@@ -11,12 +8,11 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
-          python-version: '3.12'
-          architecture: 'x64'
+          python-version: '3.13'
       - name: Set up pre-commit
         run: |
           python -m pip install --upgrade pip
diff --git a/.gitmodules b/.gitmodules
index e69de29..24582cd 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "platanus"]
+	path = platanus
+	url = https://github.com/sukeya/platanus.git
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 367d5fe..c3a3919 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -1,3 +1,4 @@
+default_stages: [pre-commit, pre-push]
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v3.2.0
diff --git a/platanus b/platanus
new file mode 160000
index 0000000..a939249
--- /dev/null
+++ b/platanus
@@ -0,0 +1 @@
+Subproject commit a9392495db854a17d0acdc1130504b209021352c