diff --git a/.cursor/rules/github-actions.mdc b/.cursor/rules/github-actions.mdc
new file mode 100644
index 0000000..0557203
--- /dev/null
+++ b/.cursor/rules/github-actions.mdc
@@ -0,0 +1,72 @@
+---
+description: Pin GitHub Actions to Node 24-compatible commit SHAs (not version tags)
+globs: .github/workflows/**/*.{yml,yaml}
+alwaysApply: false
+---
+
+# GitHub Actions — Node 24 and SHA pinning
+
+When you **create or change** any file under `.github/workflows/` (or composite/reusable actions under `.github/actions/`):
+
+## 1. Use Node 24–compatible action majors
+
+GitHub deprecated Node 20 for JavaScript actions. Do **not** use older majors that still target Node 20:
+
+| Action | Do not use | Use instead |
+|--------|------------|-------------|
+| `actions/checkout` | v4 and below | **v6** |
+| `actions/setup-node` | v4 and below | **v6** |
+| `actions/setup-python` | v5 and below | **v6** |
+| `actions/upload-artifact` | v4 and below | **v7** |
+| `actions/download-artifact` | v4 and below | **v8** |
+| `actions/cache` | v4 and below | **v5** |
+
+Apply the same rule to other official `actions/*` helpers: pick the current major whose `action.yml` declares `using: node24`.
+
+## 2. Pin every `uses:` to a commit SHA
+
+- **Never** leave floating refs: `@v6`, `@v4`, `@main`, branch names, or tags alone.
+- **Always** use the 40-character commit SHA, with the human-readable version in a trailing comment.
+
+```yaml
+# Bad
+uses: actions/checkout@v6
+
+# Good
+uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+```
+
+Preferred SHAs for common official actions (update when bumping):
+
+```yaml
+uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38 # v6.5.0
+uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5
+```
+
+Resolve newer SHAs from the latest patch tag on the major line:
+
+```bash
+gh api "repos/actions/checkout/git/ref/tags/v6.0.3" -q '.object.sha'
+# If type is "tag", dereference: gh api "repos/actions/checkout/git/tags/SHA" -q '.object.sha'
+```
+
+Apply the same SHA-pinning rule to third-party actions (`uses: org/action@sha # vX.Y.Z`).
+
+## 3. Run actionlint before finishing
+
+```bash
+actionlint .github/workflows/*.yml
+```
+
+Fix all errors and warnings; re-run until exit code 0.
+
+## 4. Completion checklist
+
+- [ ] Official actions use Node 24–compatible majors (v6/v7/v8/v5 as above)
+- [ ] Every `uses:` references a full commit SHA (not a tag/branch)
+- [ ] Version comments match the resolved release (e.g. `# v6.0.3`)
+- [ ] `actionlint` passes on changed workflows
diff --git a/.github/workflows/proxy_integration_tests.yml b/.github/workflows/proxy_integration_tests.yml
index 60b9acb..9dac3a7 100644
--- a/.github/workflows/proxy_integration_tests.yml
+++ b/.github/workflows/proxy_integration_tests.yml
@@ -16,12 +16,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           persist-credentials: false
 
       - name: Set up Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38 # v6.5.0
         with:
           node-version: "22"
           cache: npm
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 2fcd234..2a71f70 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -22,7 +22,7 @@ jobs:
       contents: read
       id-token: write
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           ref: ${{ github.event_name == 'workflow_run' && 'main' || github.event_name == 'release' && github.ref || 'main' }}
 
@@ -50,7 +50,7 @@ jobs:
       # the toolcache `npm` binary on GitHub-hosted runners, so `npm publish` stayed on 10.x and OIDC trusted publishing never ran.
       - name: Setup Node
         if: steps.gate.outputs.publish == 'true'
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38 # v6.5.0
         with:
           node-version: 24
           cache: npm
diff --git a/.github/workflows/release-on-merge.yml b/.github/workflows/release-on-merge.yml
index 7c06786..6487546 100644
--- a/.github/workflows/release-on-merge.yml
+++ b/.github/workflows/release-on-merge.yml
@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout merge commit
-        uses: actions/checkout@v6
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           ref: ${{ github.event.pull_request.merge_commit_sha }}
 
diff --git a/package-lock.json b/package-lock.json
index e8648dc..b111fc7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -39,7 +39,7 @@
         "node-fetch": "^3.0.0",
         "superagent": "^8.0.0 || ^9.0.0 || ^10.0.0",
         "typed-rest-client": "^2.0.0",
-        "undici": "^5.0.0 || ^6.0.0 || ^7.0.0",
+        "undici": "^8.0.2",
         "wretch": "^2.0.0 || ^3.0.0"
       },
       "peerDependenciesMeta": {
@@ -2920,9 +2920,9 @@
       "license": "MIT"
     },
     "node_modules/undici": {
-      "version": "8.5.0",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-8.5.0.tgz",
-      "integrity": "sha512-xamtWoB1EshgjpmlXd7GGm2VfdDtw1+rD8uhry8pSNW3If6S8E0m2T2+orSKeZXEn/aPJMviCpDBA65WJt8zhg==",
+      "version": "8.9.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-8.9.0.tgz",
+      "integrity": "sha512-aWZpUj7XoGonMClx4gdDRfgBjqeA+F473aDmROQQbM9n6PRfK/u1q/a0X4wMTgcHfT8H6fpbt98PFuDUwFg2YA==",
       "dev": true,
       "license": "MIT",
       "engines": {