diff --git a/.github/workflows/ci-linux.yml b/.github/workflows/ci-linux.yml
index d2fb70d4e0..68853ca122 100644
--- a/.github/workflows/ci-linux.yml
+++ b/.github/workflows/ci-linux.yml
@@ -24,7 +24,7 @@ jobs:
     name: Ubuntu arm64
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           repository: ${{ inputs.repository || github.repository }}
           ref: ${{ inputs.ref }}
@@ -36,7 +36,7 @@ jobs:
       - name: Check build artifacts for leaked secrets
         run: ./script/check-build-secrets.sh
       - name: Upload output artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: ubuntu-arm64-artifacts
           path: |
@@ -50,7 +50,7 @@ jobs:
     name: Ubuntu arm
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           repository: ${{ inputs.repository || github.repository }}
           ref: ${{ inputs.ref }}
@@ -62,7 +62,7 @@ jobs:
       - name: Check build artifacts for leaked secrets
         run: ./script/check-build-secrets.sh
       - name: Upload output artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: ubuntu-arm-artifacts
           path: |
@@ -76,7 +76,7 @@ jobs:
     name: Ubuntu x64
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           repository: ${{ inputs.repository || github.repository }}
           ref: ${{ inputs.ref }}
@@ -88,7 +88,7 @@ jobs:
       - name: Check build artifacts for leaked secrets
         run: ./script/check-build-secrets.sh
       - name: Upload output artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: ubuntu-amd64-artifacts
           path: |
@@ -109,16 +109,16 @@ jobs:
       id-token: write      # mint the short-lived Sigstore identity
       attestations: write  # record the provenance attestation
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       - name: Use Node.js 20.17.0
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v7
         with:
           node-version: 20.17.0
           cache: yarn
 
       - name: Download all artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           path: './artifacts'
 
@@ -165,7 +165,7 @@ jobs:
           echo "---"
 
       - name: Create Release
-        uses: softprops/action-gh-release@v2
+        uses: softprops/action-gh-release@v3
         with:
           name: GitHub Desktop for Linux ${{ env.RELEASE_TAG_WITHOUT_PREFIX }}
           body_path: script/release_notes.txt
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8614f4486b..f1c9e92ee1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -56,12 +56,12 @@ jobs:
     env:
       RELEASE_CHANNEL: ${{ inputs.environment }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           repository: ${{ inputs.repository || github.repository }}
           ref: ${{ inputs.ref }}
           submodules: recursive
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v7
         with:
           node-version: ${{ env.NODE_VERSION }}
           cache: yarn
@@ -91,16 +91,16 @@ jobs:
     env:
       RELEASE_CHANNEL: ${{ inputs.environment }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           repository: ${{ inputs.repository || github.repository }}
           ref: ${{ inputs.ref }}
           submodules: recursive
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v7
         with:
           python-version: '3.11'
       - name: Use Node.js ${{ env.NODE_VERSION }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v7
         with:
           node-version: ${{ env.NODE_VERSION }}
           cache: yarn
@@ -148,7 +148,7 @@ jobs:
           AZURE_CLIENT_ID: ${{ secrets.AZURE_CODE_SIGNING_CLIENT_ID }}
           AZURE_CLIENT_SECRET: ${{ secrets.AZURE_CODE_SIGNING_CLIENT_SECRET }}
       - name: Upload artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         if: ${{ inputs.upload-artifacts }}
         with:
           name: ${{matrix.friendlyName}}-${{matrix.arch}}
diff --git a/.github/workflows/close-single-word-issues.yml b/.github/workflows/close-single-word-issues.yml
index f2ef0dae8e..82eedb6a8e 100644
--- a/.github/workflows/close-single-word-issues.yml
+++ b/.github/workflows/close-single-word-issues.yml
@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Close Single-Word Issue
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 0df88e9c02..d9e71e4dd9 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL
diff --git a/.github/workflows/create-draft-release.yml b/.github/workflows/create-draft-release.yml
index 94c08b1a1f..a4cee2c5a1 100644
--- a/.github/workflows/create-draft-release.yml
+++ b/.github/workflows/create-draft-release.yml
@@ -22,7 +22,7 @@ jobs:
     name: Publish draft release
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           token: ${{ secrets.CREATE_RELEASE_AUTOMATION_TOKEN }}
       - name: Configure git
diff --git a/.github/workflows/publish-apt.yml b/.github/workflows/publish-apt.yml
index 2e83598b0a..445bf1460e 100644
--- a/.github/workflows/publish-apt.yml
+++ b/.github/workflows/publish-apt.yml
@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout (reprepro conf + public key)
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
 
       - name: Install tooling
         run: |
@@ -103,10 +103,31 @@ jobs:
           AWS_ACCESS_KEY_ID: ${{ secrets.R2_ACCESS_KEY_ID }}
           AWS_SECRET_ACCESS_KEY: ${{ secrets.R2_SECRET_ACCESS_KEY }}
           AWS_DEFAULT_REGION: auto
+          R2_ACCOUNT_ID: ${{ secrets.R2_ACCOUNT_ID }}
         run: |
+          set -euo pipefail
           mkdir -p repo
-          aws s3 sync "s3://$BUCKET/$PREFIX" repo \
-            --endpoint-url "https://${{ secrets.R2_ACCOUNT_ID }}.r2.cloudflarestorage.com" || true
+          endpoint="https://${R2_ACCOUNT_ID}.r2.cloudflarestorage.com"
+
+          # This step used to end in `|| true`. A failed pull therefore looked
+          # exactly like an empty repository: reprepro would add the one incoming
+          # package, export, and the sync would overwrite dists/ with a
+          # single-package index. Every previously published version silently
+          # stops being listed, and the run stays green.
+          #
+          # So: let a genuine failure fail, and separately catch the case where
+          # the remote has content but nothing arrived - which a zero exit code
+          # alone would not reveal.
+          remote=$(aws s3 ls "s3://$BUCKET/$PREFIX/" --recursive --endpoint-url "$endpoint" | wc -l)
+          aws s3 sync "s3://$BUCKET/$PREFIX" repo --endpoint-url "$endpoint" --no-progress
+          pulled=$(find repo -type f | wc -l)
+          echo "remote objects: $remote, pulled: $pulled"
+
+          if [ "$remote" -gt 0 ] && [ "$pulled" -eq 0 ]; then
+            echo "::error::Remote holds $remote objects but none were pulled. Refusing to"
+            echo "::error::republish, which would drop every existing package from the index."
+            exit 1
+          fi
 
       - name: Prepare reprepro config
         run: |
diff --git a/.github/workflows/release-pr.yml b/.github/workflows/release-pr.yml
index 8780960952..cb7d5d2fc5 100644
--- a/.github/workflows/release-pr.yml
+++ b/.github/workflows/release-pr.yml
@@ -9,7 +9,7 @@ jobs:
     permissions:
       pull-requests: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         if: |
           startsWith(github.ref, 'refs/heads/releases/') && !contains(github.ref, 'test')
 
@@ -37,7 +37,7 @@ jobs:
           private_key: ${{ secrets.DESKTOP_RELEASES_APP_PRIVATE_KEY }}
 
       - name: Create Release Pull Request
-        uses: peter-evans/create-pull-request@v7.0.6
+        uses: peter-evans/create-pull-request@v8.1.1
         if: |
           startsWith(github.ref, 'refs/heads/releases/') && !contains(github.ref, 'test')
         with:
diff --git a/.github/workflows/sync-with-upstream.yml b/.github/workflows/sync-with-upstream.yml
index 36df18944a..2c3ddc26a7 100644
--- a/.github/workflows/sync-with-upstream.yml
+++ b/.github/workflows/sync-with-upstream.yml
@@ -11,7 +11,7 @@ jobs:
     name: Sync main branch with upstream
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           token: ${{ secrets.CREATE_RELEASE_AUTOMATION_TOKEN }}
       - name: Configure git