diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 0000000..017ce62
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1 @@
+* @yuriizee
diff --git a/.github/SECURITY.md b/.github/SECURITY.md
index 6d0cc71..8c15dd4 100644
--- a/.github/SECURITY.md
+++ b/.github/SECURITY.md
@@ -4,14 +4,16 @@
 
 | Version | Supported |
 | ------- | --------- |
-| 1.x     | ✅        |
-| < 1.0   | ❌        |
+| 2.x     | ✅        |
+| < 2.0   | ❌        |
 
 ## Reporting a vulnerability
 
 **Please do not report security vulnerabilities through public GitHub issues.**
 
-Email [yuriyzee@gmail.com](mailto:yuriyzee@gmail.com) with:
+Report it privately through
+[GitHub Security Advisories](https://github.com/std-out/simple-data-objects/security/advisories/new)
+or email [yuriyzee@gmail.com](mailto:yuriyzee@gmail.com) with:
 
 - a description of the issue and its impact,
 - a minimal reproduction if possible,
@@ -21,6 +23,15 @@ You'll get an acknowledgement within 48 hours and a status update within 7
 days. Once a fix is released, we'll coordinate disclosure with you and credit
 you in the release notes (unless you prefer to stay anonymous).
 
+## Verifying a release
+
+Every release carries a source archive, a CycloneDX SBOM and a signed build
+provenance attestation:
+
+```sh
+gh attestation verify simple-data-objects-vX.Y.Z.tar.gz --repo std-out/simple-data-objects
+```
+
 ## Security-sensitive areas
 
 Two parts of the codebase carry explicit security invariants:
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..fecd44d
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,9 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      actions:
+        patterns: ["*"]
diff --git a/.github/workflows/pages.yml b/.github/workflows/pages.yml
index 5697fe8..ac2d93d 100644
--- a/.github/workflows/pages.yml
+++ b/.github/workflows/pages.yml
@@ -20,28 +20,28 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout main
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
         with:
           ref: main
           path: main
           fetch-depth: 0
 
       - name: Checkout v1
-        uses: actions/checkout@v7
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
         with:
           ref: v1
           path: v1
           fetch-depth: 0
 
       - name: Setup Node
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38
         with:
           node-version: 24
           cache: npm
           cache-dependency-path: main/package-lock.json
 
       - name: Setup Pages
-        uses: actions/configure-pages@v6
+        uses: actions/configure-pages@45bfe0192ca1faeb007ade9deae92b16b8254a0d
 
       - name: Build main docs (v2.0 — current)
         working-directory: main
@@ -63,7 +63,7 @@ jobs:
           cp -r v1/docs/.vitepress/dist/. site/v1/
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v5
+        uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9
         with:
           path: site
 
@@ -79,4 +79,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v5
+        uses: actions/deploy-pages@368f82528645a54fb793d4d04e342629a3f51346
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..c0fe4af
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,64 @@
+name: Release artifacts
+
+on:
+  release:
+    types: [published]
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: Release tag
+        required: true
+
+permissions:
+  contents: write
+  id-token: write
+  attestations: write
+
+jobs:
+  attest:
+    name: Provenance and SBOM
+    runs-on: ubuntu-latest
+    env:
+      TAG: ${{ github.event.release.tag_name || inputs.tag }}
+      GH_TOKEN: ${{ github.token }}
+
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
+        with:
+          ref: ${{ env.TAG }}
+          persist-credentials: false
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@eb7c497e18156a6bbabfef1d3a82760b9eda3962
+        with:
+          php-version: "8.4"
+          coverage: none
+
+      - name: Build source archive
+        run: git archive --format=tar.gz --prefix="simple-data-objects-$TAG/" -o "simple-data-objects-$TAG.tar.gz" "$TAG"
+
+      - name: Resolve runtime dependencies
+        run: composer install --no-dev --no-interaction --prefer-dist
+
+      - name: Generate SBOM
+        uses: anchore/sbom-action@66cbf4bc1f1c0d2edc94016e65bc221b6bb0ad6c
+        with:
+          path: .
+          format: cyclonedx-json
+          output-file: simple-data-objects-${{ env.TAG }}.cdx.json
+          upload-artifact: false
+          upload-release-assets: false
+
+      - name: Attest build provenance
+        uses: actions/attest-build-provenance@4d101475d8b20a2381f78447822ac1eab6504dd8
+        with:
+          subject-path: simple-data-objects-${{ env.TAG }}.tar.gz
+
+      - name: Attest SBOM
+        uses: actions/attest-sbom@c604332985a26aa8cf1bdc465b92731239ec6b9e
+        with:
+          subject-path: simple-data-objects-${{ env.TAG }}.tar.gz
+          sbom-path: simple-data-objects-${{ env.TAG }}.cdx.json
+
+      - name: Upload release assets
+        run: gh release upload "$TAG" "simple-data-objects-$TAG.tar.gz" "simple-data-objects-$TAG.cdx.json" --clobber --repo "$GITHUB_REPOSITORY"
diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml
index 4836ff7..9a7ad46 100644
--- a/.github/workflows/security.yml
+++ b/.github/workflows/security.yml
@@ -3,19 +3,24 @@ name: Security
 on:
   push:
     branches: [main, v2]
+  pull_request:
+    branches: [main, v2]
   schedule:
     - cron: "0 8 * * *"
 
+permissions:
+  contents: read
+
 jobs:
   audit:
     name: Composer Audit
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
 
       - name: Set up PHP
-        uses: shivammathur/setup-php@v2
+        uses: shivammathur/setup-php@eb7c497e18156a6bbabfef1d3a82760b9eda3962
         with:
           php-version: "8.4"
           coverage: none
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 8cda913..31023e1 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [main, v2]
 
+permissions:
+  contents: read
+
 jobs:
   test:
     name: PHP ${{ matrix.php }} / Laravel ${{ matrix.laravel }}
@@ -29,10 +32,10 @@ jobs:
             phpunit: "^11.5.50"
 
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
 
       - name: Set up PHP ${{ matrix.php }}
-        uses: shivammathur/setup-php@v2
+        uses: shivammathur/setup-php@eb7c497e18156a6bbabfef1d3a82760b9eda3962
         with:
           php-version: ${{ matrix.php }}
           coverage: none
@@ -60,10 +63,10 @@ jobs:
     needs: test
 
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
 
       - name: Set up PHP 8.4 with pcov
-        uses: shivammathur/setup-php@v2
+        uses: shivammathur/setup-php@eb7c497e18156a6bbabfef1d3a82760b9eda3962
         with:
           php-version: "8.4"
           coverage: pcov
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e12989f..2f16a53 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ and the project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Changed
+- Releases ship with a source archive, a CycloneDX SBOM and a build
+  provenance attestation (`gh attestation verify`). Security reports go
+  through GitHub private vulnerability reporting; 2.x is the supported line.
+
 ## [2.2.1] — 2026-10-16
 
 ### Security