diff --git a/.github/workflows/appimage-build.yml b/.github/workflows/appimage-build.yml
index 32c9c31f..fd5b452d 100644
--- a/.github/workflows/appimage-build.yml
+++ b/.github/workflows/appimage-build.yml
@@ -10,6 +10,12 @@ jobs:
   appimage_build:
     runs-on: ubuntu-24.04
 
+    permissions:
+      contents: read
+      id-token: write
+      attestations: write
+      artifact-metadata: write
+
     steps:
       - uses: actions/checkout@v4
         with:
@@ -113,6 +119,12 @@ jobs:
           appimage_path="$(ls -1 *.AppImage | grep -v linuxdeploy | head -n 1)"
           mv "$appimage_path" "Zoitechat-${VERSION}-x86_64.AppImage"
 
+      - name: Attest AppImage (Build Provenance)
+        if: ${{ github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository }}
+        uses: actions/attest-build-provenance@v3
+        with:
+          subject-path: Zoitechat-*-x86_64.AppImage
+
       - name: Upload AppImage artifact
         uses: actions/upload-artifact@v4
         with:
diff --git a/.github/workflows/flatpak-build.yml b/.github/workflows/flatpak-build.yml
index 9447ef60..3362592a 100644
--- a/.github/workflows/flatpak-build.yml
+++ b/.github/workflows/flatpak-build.yml
@@ -9,6 +9,13 @@ on:
 jobs:
   flatpak_build:
     runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      id-token: write
+      attestations: write
+      artifact-metadata: write
+
     container:
       image: ghcr.io/flathub-infra/flatpak-github-actions:gnome-49
       options: --privileged
@@ -18,8 +25,23 @@ jobs:
         with:
           submodules: true
 
-      - uses: flatpak/flatpak-github-actions/flatpak-builder@v6
+      - name: Build Flatpak
+        id: flatpak_builder
+        uses: flatpak/flatpak-github-actions/flatpak-builder@v6
         with:
           bundle: zoitechat.flatpak
           manifest-path: flatpak/net.zoite.Zoitechat.json
           cache-key: flatpak-builder-${{ github.sha }}
+
+      - name: Upload Flatpak Bundle
+        id: upload_flatpak
+        uses: actions/upload-artifact@v4
+        with:
+          name: zoitechat.flatpak
+          path: zoitechat.flatpak
+
+      - name: Attest Flatpak Bundle (Build Provenance)
+        if: ${{ github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository }}
+        uses: actions/attest-build-provenance@v3
+        with:
+          subject-path: zoitechat.flatpak
diff --git a/.github/workflows/windows-build.yml b/.github/workflows/windows-build.yml
index 63970658..0e835b16 100644
--- a/.github/workflows/windows-build.yml
+++ b/.github/workflows/windows-build.yml
@@ -11,6 +11,13 @@ on:
 jobs:
   windows_build:
     runs-on: windows-2019
+
+    permissions:
+      contents: read
+      id-token: write
+      attestations: write
+      artifact-metadata: write
+
     strategy:
       matrix:
         platform: [x64, win32]
@@ -90,12 +97,30 @@ jobs:
           move ..\zoitechat-build .\
         shell: cmd
 
-      - uses: actions/upload-artifact@v4
+      - name: Upload Installer
+        id: upload_installer
+        uses: actions/upload-artifact@v4
         with:
           name: Installer ${{ matrix.arch }}
           path: ZoiteChat*.exe
 
-      - uses: actions/upload-artifact@v4
+      - name: Attest Installer (Artifact Attestation)
+        if: ${{ github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository }}
+        uses: actions/attest-build-provenance@v3
+        with:
+          subject-name: Installer ${{ matrix.arch }}
+          subject-digest: sha256:${{ steps.upload_installer.outputs.artifact-digest }}
+
+      - name: Upload Build Files
+        id: upload_buildfiles
+        uses: actions/upload-artifact@v4
         with:
           name: Build Files ${{ matrix.arch }}
           path: zoitechat-build
+
+      - name: Attest Build Files (Artifact Attestation)
+        if: ${{ github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository }}
+        uses: actions/attest-build-provenance@v3
+        with:
+          subject-name: Build Files ${{ matrix.arch }}
+          subject-digest: sha256:${{ steps.upload_buildfiles.outputs.artifact-digest }}