diff --git a/.github/workflows/actionlint.yaml b/.github/workflows/actionlint.yaml
deleted file mode 100644
index cf63593..0000000
--- a/.github/workflows/actionlint.yaml
+++ /dev/null
@@ -1,16 +0,0 @@
----
-name: actionlint
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
-jobs:
-  default:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: aquaproj/aqua-installer@v1.1.2
-        with:
-          aqua_version: v1.19.2
-      - run: actionlint
diff --git a/.github/workflows/prettier.yaml b/.github/workflows/prettier.yaml
deleted file mode 100644
index 2a0464b..0000000
--- a/.github/workflows/prettier.yaml
+++ /dev/null
@@ -1,14 +0,0 @@
----
-name: prettier
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
-jobs:
-  prettier:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - run: npm i -g prettier
-      - run: prettier -c .
diff --git a/.github/workflows/renovate-config-validator.yaml b/.github/workflows/renovate-config-validator.yaml
deleted file mode 100644
index 3e33595..0000000
--- a/.github/workflows/renovate-config-validator.yaml
+++ /dev/null
@@ -1,22 +0,0 @@
-name: renovate-config-validator
-
-on:
-  pull_request:
-    branches:
-      - main
-    paths:
-      - .github/workflows/renovate-config-validator.yaml
-      - renovate.json
-  push:
-    branches:
-      - main
-    paths:
-      - .github/workflows/renovate-config-validator.yaml
-      - renovate.json
-
-jobs:
-  validate:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      - uses: suzuki-shunsuke/github-action-renovate-config-validator@v0.1.2
diff --git a/aqua.yaml b/aqua.yaml
deleted file mode 100644
index c3069c3..0000000
--- a/aqua.yaml
+++ /dev/null
@@ -1,8 +0,0 @@
----
-# aqua - Declarative CLI Version Manager
-# https://aquaproj.github.io/
-registries:
-  - type: standard
-    ref: v3.59.0 # renovate: depName=aquaproj/aqua-registry
-packages:
-  - name: rhysd/actionlint@v1.6.19