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diff --git a/.github/workflows/update-lock.yaml b/.github/workflows/update-lock.yaml
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+name: Update flake.lock
+
+on:
+  schedule:
+    # run every saturday
+    - cron: "0 0 * * 6"
+  workflow_dispatch:
+
+jobs:
+  update:
+    name: Update
+    runs-on: ubuntu-latest
+    container: nixos/nix:sha256:b8ea88f763f33dfda2317b55eeda3b1a4006692ee29e60ee54ccf6d07348c598 # 2.19.3
+
+    permissions:
+      contents: write
+      pull-requests: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+
+      - name: Create new branch
+        id: branch
+        run: |
+          branch="update-flake-lock"
+
+          echo "branch=$branch" >> "$GITHUB_OUTPUT"
+          git switch -c "$branch"
+
+      - name: Update flake inputs
+        run: |
+            nix flake update \
+              --commit-lock-file \
+              --commit-lockfile-summary "chore: update flake inputs"
+
+      - name: Update test flake inputs
+        run: |
+          pushd ./dev
+
+          nix flake update \
+            --commit-lock-file \
+            --commit-lockfile-summary "chore: update test flake inputs"
+
+          popd
+
+      - name: Make PR if needed
+        env:
+          GH_TOKEN: ${{ github.token }}
+          BRANCH: ${{ steps.branch.outputs.branch }}
+        run: |
+          if ! git diff --color=always --exit-code origin/main; then
+            git push -u origin "$BRANCH"
+
+            gh pr create \
+              --base main \
+              --head "$BRANCH" \
+              --title "chore: update flake inputs" \
+              --fill
+          fi