diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e4adf47f..bf3e097e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,18 +10,18 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           fetch-depth: 0
 
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: "22"
           cache: npm
 
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: "3.12"
           cache: pip
@@ -62,7 +62,7 @@ jobs:
 
     steps:
       - name: Checkout NodeRoom
-        uses: actions/checkout@v4
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
           path: noderoom
@@ -75,14 +75,14 @@ jobs:
           echo "sha=$sha" >> "$GITHUB_OUTPUT"
 
       - name: Checkout NodeSlide package producer
-        uses: actions/checkout@v4
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           repository: HomenShum/NodeSlide
           ref: ${{ steps.nodeslide-release.outputs.sha }}
           path: nodeslide
 
       - name: Setup Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: "22"
           cache: npm
@@ -126,7 +126,7 @@ jobs:
         run: npm run nodeslide:mounted:release:proof -- --json-out nodeslide-mounted-release-proof.json
 
       - name: Upload mounted release receipt
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: nodeslide-mounted-release-${{ github.run_id }}
           path: noderoom/nodeslide-mounted-release-proof.json
diff --git a/.github/workflows/design-gate.yml b/.github/workflows/design-gate.yml
index 3740cf01..ae0683aa 100644
--- a/.github/workflows/design-gate.yml
+++ b/.github/workflows/design-gate.yml
@@ -18,8 +18,8 @@ jobs:
     env:
       QA_BASE_URL: http://localhost:5301
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: 22
           cache: npm
@@ -50,7 +50,7 @@ jobs:
 
       - name: Upload design-QA reports
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: design-qa-reports
           path: .tmp-qa/**
diff --git a/.github/workflows/node-platform-conformance.yml b/.github/workflows/node-platform-conformance.yml
index e2e24402..72eae5a5 100644
--- a/.github/workflows/node-platform-conformance.yml
+++ b/.github/workflows/node-platform-conformance.yml
@@ -10,4 +10,4 @@ permissions:
 
 jobs:
   node-platform:
-    uses: HomenShum/node-platform/.github/workflows/repo-conformance.yml@ef4ac8a011b230efa3324892a193abe02ff2d673
+    uses: HomenShum/node-platform/.github/workflows/repo-conformance.yml@5c9aa6443ca8e61dc8886fbf0a0b4a7b72858e63 # Node 24 action pins (PR #8)
diff --git a/.github/workflows/proofloop-gate.yml b/.github/workflows/proofloop-gate.yml
index b9759fd4..35d6de4b 100644
--- a/.github/workflows/proofloop-gate.yml
+++ b/.github/workflows/proofloop-gate.yml
@@ -15,8 +15,8 @@ jobs:
   proofloop-gate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: 22
       - run: npm ci
diff --git a/.github/workflows/proofloop-suites.yml b/.github/workflows/proofloop-suites.yml
index ee077561..c62822f1 100644
--- a/.github/workflows/proofloop-suites.yml
+++ b/.github/workflows/proofloop-suites.yml
@@ -15,8 +15,8 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 20
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: 22
           cache: npm
@@ -28,7 +28,7 @@ jobs:
           CI: "true"
       - name: Upload proof artifacts
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: proofloop-accounting
           path: .proofloop/runs/latest/
@@ -39,8 +39,8 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 20
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: 22
           cache: npm
@@ -52,7 +52,7 @@ jobs:
           CI: "true"
       - name: Upload proof artifacts
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: proofloop-notion
           path: .proofloop/runs/latest/
diff --git a/.github/workflows/proofloop.yml b/.github/workflows/proofloop.yml
index e304d04b..290c4853 100644
--- a/.github/workflows/proofloop.yml
+++ b/.github/workflows/proofloop.yml
@@ -9,8 +9,8 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: 22
           cache: npm
@@ -23,7 +23,7 @@ jobs:
           VITE_CONVEX_URL: ${{ secrets.VITE_CONVEX_URL }}
       - name: Upload proof artifacts
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: proximitty-underwriting-pr0
           path: .proofloop/runs/latest/
diff --git a/.github/workflows/refresh-design-baselines.yml b/.github/workflows/refresh-design-baselines.yml
index d0c46f6c..fe740acc 100644
--- a/.github/workflows/refresh-design-baselines.yml
+++ b/.github/workflows/refresh-design-baselines.yml
@@ -13,8 +13,8 @@ jobs:
     env:
       QA_BASE_URL: http://localhost:5301
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: 22
           cache: npm
@@ -28,7 +28,7 @@ jobs:
         run: npx playwright test design-baseline --update-snapshots
       - name: Upload refreshed snapshots
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: design-baselines
           path: e2e/design-baseline.spec.ts-snapshots/**
diff --git a/.github/workflows/scaffold-check.yml b/.github/workflows/scaffold-check.yml
index 0dfa640d..b97b1d13 100644
--- a/.github/workflows/scaffold-check.yml
+++ b/.github/workflows/scaffold-check.yml
@@ -12,11 +12,11 @@ jobs:
   scaffold-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           fetch-depth: 0
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: 22
 
@@ -46,7 +46,7 @@ jobs:
       - name: Post scaffold report as PR comment
         if: always() && steps.handoff.outputs.exists == 'true'
         continue-on-error: true
-        uses: actions/github-script@v7
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
         with:
           script: |
             const fs = require('fs');
@@ -91,7 +91,7 @@ jobs:
 
       - name: Upload scaffold artifacts
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: scaffold-report
           path: |
diff --git a/proofloop/templates/github-proofloop-gate.yml b/proofloop/templates/github-proofloop-gate.yml
index a944cec1..a619ab97 100644
--- a/proofloop/templates/github-proofloop-gate.yml
+++ b/proofloop/templates/github-proofloop-gate.yml
@@ -15,8 +15,8 @@ jobs:
   proofloop-gate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
           node-version: 22
       - run: npm ci
diff --git a/tests/githubActionsRuntimePins.test.ts b/tests/githubActionsRuntimePins.test.ts
new file mode 100644
index 00000000..44114b8f
--- /dev/null
+++ b/tests/githubActionsRuntimePins.test.ts
@@ -0,0 +1,57 @@
+import { readdirSync, readFileSync } from "node:fs";
+import { join } from "node:path";
+import { describe, expect, it } from "vitest";
+
+const expectedPins = {
+  checkout: {
+    sha: "3d3c42e5aac5ba805825da76410c181273ba90b1",
+    version: "v7.0.1",
+  },
+  "setup-node": {
+    sha: "820762786026740c76f36085b0efc47a31fe5020",
+    version: "v7.0.0",
+  },
+  "setup-python": {
+    sha: "5fda3b95a4ea91299a34e894583c3862153e4b97",
+    version: "v7.0.0",
+  },
+  "upload-artifact": {
+    sha: "043fb46d1a93c77aae656e7c1c64a875d1fc6a0a",
+    version: "v7.0.1",
+  },
+  "github-script": {
+    sha: "3a2844b7e9c422d3c10d287c895573f7108da1b3",
+    version: "v9.0.0",
+  },
+} as const;
+
+const workflowDirectory = join(process.cwd(), ".github", "workflows");
+const workflowFiles = readdirSync(workflowDirectory)
+  .filter((name) => name.endsWith(".yml") || name.endsWith(".yaml"))
+  .map((name) => join(workflowDirectory, name));
+const files = [...workflowFiles, join(process.cwd(), "proofloop", "templates", "github-proofloop-gate.yml")];
+
+describe("GitHub Actions JavaScript runtime pins", () => {
+  it("uses immutable Node 24 release commits with readable version comments", () => {
+    for (const file of files) {
+      const lines = readFileSync(file, "utf8").split(/\r?\n/);
+
+      for (const [index, line] of lines.entries()) {
+        const action = Object.keys(expectedPins).find((name) => line.includes(`actions/${name}@`));
+        if (!action) continue;
+
+        const pin = expectedPins[action as keyof typeof expectedPins];
+        expect(line.trim(), `${file}:${index + 1}`).toContain(
+          `uses: actions/${action}@${pin.sha} # ${pin.version}`,
+        );
+      }
+    }
+  });
+
+  it("binds Node Platform conformance to the warning-free immutable producer", () => {
+    const workflow = readFileSync(join(workflowDirectory, "node-platform-conformance.yml"), "utf8");
+    expect(workflow).toContain(
+      "HomenShum/node-platform/.github/workflows/repo-conformance.yml@5c9aa6443ca8e61dc8886fbf0a0b4a7b72858e63 # Node 24 action pins (PR #8)",
+    );
+  });
+});
diff --git a/tests/proofloopCi.test.ts b/tests/proofloopCi.test.ts
index f4e48804..68e950ca 100644
--- a/tests/proofloopCi.test.ts
+++ b/tests/proofloopCi.test.ts
@@ -37,7 +37,8 @@ describe("proofloop ci install github", () => {
     const workflow = readFileSync(result.workflowPath, "utf8");
     // The exact gate contract from scripts/proofloop-cli.ts cmdGoalGate.
     expect(workflow).toContain("npx tsx scripts/proofloop-cli.ts gate --goal official-scores");
-    expect(workflow).toContain("actions/setup-node@v4");
+    expect(workflow).toContain("actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1");
+    expect(workflow).toContain("actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0");
     expect(workflow).toContain("node-version: 22");
     expect(workflow).toContain("npm ci");
     expect(workflow).not.toContain(PROOFLOOP_CI_GOAL_PLACEHOLDER);