diff --git a/.github/workflows/ci.json.yaml b/.github/workflows/ci.json.yaml
index cb90b94..bef011a 100644
--- a/.github/workflows/ci.json.yaml
+++ b/.github/workflows/ci.json.yaml
@@ -11,4 +11,4 @@ on:
   workflow_dispatch:
 jobs:
   lint:
-    uses: parcelLab/ci/.github/workflows/json.yaml@v9
+    uses: ./.github/workflows/json.yaml
diff --git a/.github/workflows/ci.pr.yaml b/.github/workflows/ci.pr.yaml
index 254cd72..36c8e2f 100644
--- a/.github/workflows/ci.pr.yaml
+++ b/.github/workflows/ci.pr.yaml
@@ -24,4 +24,5 @@ jobs:
       - name: Run actionlint
         run: /home/runner/go/bin/actionlint
   yamllint:
-    uses: parcelLab/ci/.github/workflows/yaml.yaml@v9
+    # Local copy, not @v9: a PR must validate its own workflow changes.
+    uses: ./.github/workflows/yaml.yaml
diff --git a/.github/workflows/ci.yaml.yaml b/.github/workflows/ci.yaml.yaml
index cf27840..b38ea4c 100644
--- a/.github/workflows/ci.yaml.yaml
+++ b/.github/workflows/ci.yaml.yaml
@@ -15,4 +15,4 @@ on:
   workflow_dispatch:
 jobs:
   lint:
-    uses: parcelLab/ci/.github/workflows/yaml.yaml@v9
+    uses: ./.github/workflows/yaml.yaml
diff --git a/.github/workflows/json.yaml b/.github/workflows/json.yaml
index 9f07637..6f581ed 100644
--- a/.github/workflows/json.yaml
+++ b/.github/workflows/json.yaml
@@ -19,7 +19,9 @@ jobs:
     steps:
       - name: Checkout current git repository
         uses: actions/checkout@v7
-      - name: Lint JSON
-        uses: actionsx/prettier@v3
+      - name: Set up node environment
+        uses: actions/setup-node@v7
         with:
-          args: --check "**/*.json"
+          node-version: lts/*
+      - name: Lint JSON
+        run: npx --yes prettier@3.9.6 --check -- "**/*.json"
diff --git a/.github/workflows/yaml.yaml b/.github/workflows/yaml.yaml
index 6babe49..7e97283 100644
--- a/.github/workflows/yaml.yaml
+++ b/.github/workflows/yaml.yaml
@@ -24,14 +24,18 @@ jobs:
       - name: Checkout current git repository
         uses: actions/checkout@v7
 
-      - name: Lint all YAML files
-        uses: actionsx/prettier@v3
-        if: ${{ inputs.additional_args == '' }}
+      - name: Set up node environment
+        uses: actions/setup-node@v7
         with:
-          args: --check "**/*.{yaml,yml}"
+          node-version: lts/*
 
-      - name: Lint some YAML files
-        uses: actionsx/prettier@v3
-        if: ${{ inputs.additional_args != '' }}
-        with:
-          args: --check "**/*.{yaml,yml}" "${{ inputs.additional_args }}"
+      - name: Lint YAML files
+        # npx, not npm ci: calling repositories may have no package.json.
+        env:
+          ADDITIONAL_ARGS: ${{ inputs.additional_args }}
+        run: |
+          # Split additional_args into words, but leave the globs for Prettier
+          # to interpret rather than letting bash expand them against the repo.
+          set -f
+          # shellcheck disable=SC2086
+          npx --yes prettier@3.9.6 --check -- "**/*.{yaml,yml}" $ADDITIONAL_ARGS
diff --git a/.gitignore b/.gitignore
index f78e25c..fdcd0a7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,19 +1,11 @@
-# Mac
-.DS_Store
-
-# Node
-node_modules
-
-# Windows
-Thumbs.db
-
-# Editor
+# Directories
 .idea/
-.vscode
+.vscode/
+node_modules/
+tmp/
 
-# vi
-*~
-
-# General
-log/
+# Files
 *.log
+*~
+.DS_Store
+Thumbs.db
diff --git a/package-lock.json b/package-lock.json
index 3cd044f..8770052 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,7 +14,7 @@
         "husky": "^8.0.3",
         "is-ci": "^3.0.1",
         "lint-staged": "^13.1.0",
-        "prettier": "2.8.3"
+        "prettier": "3.9.6"
       },
       "engines": {
         "node": ">=v18.8.0"
@@ -2231,15 +2231,16 @@
       }
     },
     "node_modules/prettier": {
-      "version": "2.8.3",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-2.8.3.tgz",
-      "integrity": "sha512-tJ/oJ4amDihPoufT5sM0Z1SKEuKay8LfVAMlbbhnnkvt6BUserZylqo2PN+p9KeljLr0OHa2rXHU1T8reeoTrw==",
+      "version": "3.9.6",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.9.6.tgz",
+      "integrity": "sha512-OpN0zzVdiaiAhxpuuj5efpIS4sY9j7bY6uR5mnj5yPzGkdkjNKSJeUThPb60Jw29QuAZgA4o+/iB49kFiaBX6g==",
       "dev": true,
+      "license": "MIT",
       "bin": {
-        "prettier": "bin-prettier.js"
+        "prettier": "bin/prettier.cjs"
       },
       "engines": {
-        "node": ">=10.13.0"
+        "node": ">=14"
       },
       "funding": {
         "url": "https://github.com/prettier/prettier?sponsor=1"
diff --git a/package.json b/package.json
index e173a36..48720fa 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "husky": "^8.0.3",
     "is-ci": "^3.0.1",
     "lint-staged": "^13.1.0",
-    "prettier": "2.8.3"
+    "prettier": "3.9.6"
   },
   "lint-staged": {
     "**/*": "prettier --write --ignore-unknown"