diff --git a/.github/workflows/actions.lock b/.github/workflows/actions.lock
new file mode 100644
index 0000000..f575ebf
--- /dev/null
+++ b/.github/workflows/actions.lock
@@ -0,0 +1,14 @@
+# This file is machine-generated by `gh actions-lock`.
+# Do not edit by hand; run `gh actions-lock` to update.
+# Docs: https://gh.io/actions-lockfile
+version: 'v0.0.2'
+workflows:
+    '.github/workflows/secret-scanner.yml': []
+    '.github/workflows/push-email-notify.yml':
+        - 'dawidd6/action-send-mail@v3.12.0'
+dependencies:
+    'dawidd6/action-send-mail@v3.12.0':
+        ref: 'v3.12.0'
+        commit: 'sha1-6e502825a508b867ab2954ad6343b68787624c01'
+        owner_id: 9713907
+        repo_id: 222439721
diff --git a/.github/workflows/push-email-notify.yml b/.github/workflows/push-email-notify.yml
index 4b4e754..b69c87f 100644
--- a/.github/workflows/push-email-notify.yml
+++ b/.github/workflows/push-email-notify.yml
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: MPL-2.0
+# This workflow is managed by gh actions-lock.
 # Dormant push-email notification. ARMED by setting the repo variable
 # PUSH_EMAIL_ENABLED=true (the single on/off switch). Addresses are pre-filled;
 # sending needs the org SMTP secrets (SMTP_HOST/PORT/USER/PASS). Inherited by
@@ -15,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Send push notification email
-        uses: dawidd6/action-send-mail@6e502825a508b867ab2954ad6343b68787624c01 # pinned
+        uses: dawidd6/action-send-mail@v3.12.0
         with:
           server_address: ${{ secrets.SMTP_HOST }}
           server_port: ${{ secrets.SMTP_PORT }}
diff --git a/.github/workflows/secret-scanner.yml b/.github/workflows/secret-scanner.yml
index d325a5c..07dd1d2 100644
--- a/.github/workflows/secret-scanner.yml
+++ b/.github/workflows/secret-scanner.yml
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: MPL-2.0
+# This workflow is managed by gh actions-lock.
 # Calls the estate's shared secret scanner (gitleaks + rust-secrets +
 # shell-secrets). Added because this repository had NO leak scanning at all.
 #
@@ -13,6 +14,7 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 permissions:
+  actions: read
   contents: read
 jobs:
   secret-scan: