diff --git a/.github/workflows/auto-release.yml b/.github/workflows/auto-release.yml
index 9d13eeff..81e83afb 100644
--- a/.github/workflows/auto-release.yml
+++ b/.github/workflows/auto-release.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ github.event.workflow_run.conclusion == 'success' }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6
         with:
           fetch-depth: 0
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -174,7 +174,7 @@ jobs:
 
       - name: Setup Node.js
         if: steps.bump.outputs.skip != 'true'
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38 # v6
         with:
           node-version: 24.x
 
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 80c0151a..c6e71c6b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6
         with:
           fetch-depth: 0
 
@@ -27,7 +27,7 @@ jobs:
           version: 11
 
       - name: Setup Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38 # v6
         with:
           node-version: ${{ matrix.node-version }}
           cache: "pnpm"
@@ -69,14 +69,14 @@ jobs:
         working-directory: plugin
 
       - name: Install Temporal CLI
-        uses: temporalio/setup-temporal@v0
+        uses: temporalio/setup-temporal@1059a504f87e7fa2f385e3fa40d1aa7e62f1c6ca # v0
 
       - name: Install Bun
         # opencode-session-debt.test.ts shells out to `bun` to seed a bun:sqlite
         # database under the OpenCode debt-doctor scenario. Without bun on PATH
         # the test fails with `spawnSync bun ENOENT`. Bun is OpenCode's runtime;
         # keeping it on the CI runner mirrors the production environment.
-        uses: oven-sh/setup-bun@v2
+        uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2
         with:
           bun-version: latest
 
@@ -95,7 +95,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6
         with:
           fetch-depth: 0
 
@@ -105,7 +105,7 @@ jobs:
           version: 11
 
       - name: Setup Node.js
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38 # v6
         with:
           node-version: 24.x
           cache: "pnpm"
diff --git a/.github/workflows/security-gates-pilot.yml b/.github/workflows/security-gates-pilot.yml
index bb573056..cbad59cc 100644
--- a/.github/workflows/security-gates-pilot.yml
+++ b/.github/workflows/security-gates-pilot.yml
@@ -26,7 +26,7 @@ jobs:
     name: Security gates pilot
     # SHA pinning doesn't work cross-repo with private repos + GITHUB_TOKEN scope;
     # use @main until the reusable workflow is stable enough for branch protection.
-    uses: Sharper-Flow/sharperflow-security-gates/.github/workflows/javascript-security-gate.yml@v0
+    uses: Sharper-Flow/sharperflow-security-gates/.github/workflows/javascript-security-gate.yml@6a15da3b7eae6b6146deb72472d29b58f5c5c1c1 # v0
     permissions:
       contents: read
     with: