diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 83f65b38..5495e321 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -3,27 +3,43 @@ updates:
   # upgrade cargo patch versions once per week
   # see `workflows/upgrade.yml`
 
-  # major and minor cargo upgrades only once per week
+  # disabled for now for testing...
+  # # upgrade major and minor cargo dependencies soon
+  # - package-ecosystem: "cargo"
+  #   directory: "/"
+  #   schedule:
+  #     interval: "daily"
+  #   allow:
+  #     - update-types:
+  #       - "major"
+  #       - "minor"
+  #   # open-pull-requests-limit: 0 # temporarily disable dependabot
+
   - package-ecosystem: "cargo"
     directory: "/"
     schedule:
       interval: "weekly"
       day: "monday"
-      time: "06:00"
+      time: "04:12"
       timezone: "Europe/Berlin"
+    # allow:
+    #   - update-types:
+    #     - "patch"
     groups:
-      weekly-patch-updates:
+      # group patches for better visibility
+      weekly-cargo-patches:
         applies-to: "version-updates"
         patterns:
           - "*"
         update-types:
-          - "major"
-          - "minor"
-    # open-pull-requests-limit: 0 # temporarily disable dependabot
+          - "patch"
 
-  # upgrade all GitHub Actions soon
+  # upgrade all GitHub Actions once per week
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "daily"
+      interval: "weekly"
+      day: "monday"
+      time: "04:23"
+      timezone: "Europe/Berlin"
     # open-pull-requests-limit: 0 # temporarily disable dependabot
diff --git a/.github/workflows/cargo-update.yml b/.github/workflows/cargo-update.yml
deleted file mode 100644
index 454d13c3..00000000
--- a/.github/workflows/cargo-update.yml
+++ /dev/null
@@ -1,68 +0,0 @@
-name: Cargo Update
-
-on:
-  workflow_dispatch:
-
-  schedule:
-    - cron: "23 4 * * 1"
-
-concurrency:
-  group: cargo-update
-  cancel-in-progress: false
-
-jobs:
-  cargo-update:
-    name: Update Cargo dependencies
-    runs-on: ubicloud-standard-2
-
-    permissions:
-      contents: write
-      pull-requests: write
-
-    steps:
-      - name: Check out repository
-        uses: actions/checkout@v7
-        with:
-          persist-credentials: false
-          ref: main
-          fetch-depth: 0 # fetch entire git history
-
-      - name: cargo update
-        run: cargo update --verbose
-      - name: Validate updated lockfile
-        run: cargo metadata --locked --no-deps > /dev/null
-      - name: cargo vet regenerate exemptions
-        run: cargo vet regenerate exemptions
-
-      - name: Create pull request
-        uses: peter-evans/create-pull-request@v8
-        with:
-          token: ${{ secrets.CARGO_UPDATE_TOKEN || github.token }}
-
-          base: main
-          branch: automation/cargo-update
-          delete-branch: true
-
-          add-paths: |
-            Cargo.lock
-            supply-chain/
-
-          commit-message: "chore(deps): cargo update"
-          title: "chore(deps): cargo update"
-
-          body: |
-            This pull request was generated automatically by GitHub Workflow `Cargo Update`.
-
-            It executes:
-
-            ```bash
-            cargo update
-            cargo vet regenerate exemptions
-            ```
-
-          labels: |
-            dependencies
-            rust
-            maintenance
-
-          draft: false