diff --git a/.github/workflows/notarize-dmg.yml b/.github/workflows/notarize-dmg.yml
new file mode 100644
index 0000000..f096df7
--- /dev/null
+++ b/.github/workflows/notarize-dmg.yml
@@ -0,0 +1,47 @@
+name: Notarize the macOS .dmg
+
+# Tauri notarizes Sarala.app but only signs the .dmg around it, and Gatekeeper
+# reports a downloaded, unnotarized .dmg as rejected. This notarizes the
+# released .dmg, staples the ticket to it and replaces the release asset.
+# release.yml calls it before the cask bump (stapling changes the checksum);
+# run it by hand to fix an existing release.
+on:
+  workflow_call:
+    inputs:
+      tag:
+        type: string
+        required: true
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: Release tag, e.g. v1.4.1
+        required: true
+
+permissions:
+  contents: write
+
+jobs:
+  notarize:
+    runs-on: macos-latest
+    env:
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      TAG: ${{ inputs.tag }}
+    steps:
+      - name: Download the .dmg
+        run: |
+          gh release download "$TAG" --repo "$GITHUB_REPOSITORY" \
+            --pattern "Sarala_${TAG#v}_universal.dmg" --clobber
+
+      - name: Notarize and staple
+        env:
+          APPLE_ID: ${{ secrets.APPLE_ID }}
+          APPLE_PASSWORD: ${{ secrets.APPLE_PASSWORD }}
+          APPLE_TEAM_ID: ${{ secrets.APPLE_TEAM_ID }}
+        run: |
+          dmg="Sarala_${TAG#v}_universal.dmg"
+          xcrun stapler validate "$dmg" && { echo "Already notarized."; exit 0; }
+          xcrun notarytool submit "$dmg" --apple-id "$APPLE_ID" --password "$APPLE_PASSWORD" \
+            --team-id "$APPLE_TEAM_ID" --wait --timeout 30m
+          xcrun stapler staple "$dmg"
+          spctl --assess --type open --context context:primary-signature --verbose=2 "$dmg"
+          gh release upload "$TAG" "$dmg" --repo "$GITHUB_REPOSITORY" --clobber
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 7bd10a3..c0ad939 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -214,11 +214,20 @@ jobs:
             '{files: {"latest.json": {content: $content}}}' \
             | gh api -X PATCH "/gists/$GIST_ID" --input -
 
+  # Notarize the .dmg itself (Tauri only notarizes the app inside it) and
+  # replace the release asset with the stapled copy.
+  notarize-dmg:
+    needs: build
+    uses: ./.github/workflows/notarize-dmg.yml
+    with:
+      tag: ${{ github.ref_name }}
+    secrets: inherit
+
   # Point the Homebrew cask (Casks/sarala.rb on main) at the just-released macOS
   # .dmg by bumping its version + sha256. Runs once, after every platform has
-  # uploaded, so the .dmg exists on the release.
+  # uploaded and the .dmg is notarized, since stapling changes its checksum.
   update-cask:
-    needs: build
+    needs: notarize-dmg
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4