diff --git a/.github/workflows/branch_sync.yml b/.github/workflows/branch_sync.yml
index 0056722926f..92475094217 100644
--- a/.github/workflows/branch_sync.yml
+++ b/.github/workflows/branch_sync.yml
@@ -14,109 +14,7 @@ on:
 
 jobs:
   sync:
-    runs-on: ubuntu-latest
-    timeout-minutes: 5
-    env:
-      BASE_BRANCH: master
-      HEAD_BRANCH: ${{ inputs.head_branch || github.ref_name }}
-      STATUS_JSON: https://raw.githubusercontent.com/cylc/cylc-admin/master/docs/status/branches.json
-      FORCE_COLOR: 2
-    steps:
-      - name: Check branch name
-        shell: python
-        run: |
-          import os
-          import json
-          import sys
-          from urllib.request import urlopen
-
-          if os.environ['GITHUB_EVENT_NAME'] == 'schedule':
-            # Get branch from status page
-            meta = json.loads(
-              urlopen(os.environ['STATUS_JSON']).read()
-            )['meta_releases']
-            version = min(meta)
-            branch = meta[version][os.environ['GITHUB_REPOSITORY']]
-          else:
-            branch = os.environ['HEAD_BRANCH'].strip()
-
-          if branch.endswith('-sync'):
-            sys.exit("::error::Do not run this workflow for already-created sync branches")
-
-          with open(os.environ['GITHUB_ENV'], 'a') as F:
-            print(f'HEAD_BRANCH={branch}', file=F)
-            print(f'SYNC_BRANCH={branch}-sync', file=F)
-
-      - name: Checkout
-        uses: actions/checkout@v3
-        with:
-          fetch-depth: 0
-          ref: master
-
-      - name: Configure git
-        uses: cylc/release-actions/configure-git@v1
-
-      - name: Checkout sync branch if it exists
-        continue-on-error: true
-        run: |
-          git switch -c "$SYNC_BRANCH" "origin/${SYNC_BRANCH}"
-          echo "BASE_BRANCH=$SYNC_BRANCH" >> "$GITHUB_ENV"
-
-      - name: Attempt fast-forward
-        id: ff
-        run: |
-          if git merge "origin/${HEAD_BRANCH}" --ff-only; then
-            if [[ "$(git rev-parse HEAD)" == "$(git rev-parse "origin/${BASE_BRANCH}")" ]]; then
-              echo "::notice::$BASE_BRANCH is up to date with $HEAD_BRANCH"
-              exit 0
-            fi
-            git push origin "$BASE_BRANCH"
-          elif [[ "$BASE_BRANCH" == "$SYNC_BRANCH" ]]; then
-            echo "::notice::Cannot fast-forward $BASE_BRANCH to $HEAD_BRANCH; merge existing PR first"
-          else
-            echo "continue=true" >> "$GITHUB_OUTPUT"
-          fi
-
-      - name: Attempt merge into master
-        id: merge
-        if: steps.ff.outputs.continue
-        run: |
-          git switch master
-          if git merge "origin/${HEAD_BRANCH}"; then
-            if git diff HEAD^ --exit-code --stat; then
-              echo "::notice::No diff between master and $HEAD_BRANCH"
-              exit 0
-            fi
-          else
-            git merge --abort
-          fi
-          echo "continue=true" >> $GITHUB_OUTPUT
-
-      - name: Push sync branch
-        id: push
-        if: steps.merge.outputs.continue
-        run: |
-          git switch -c "$SYNC_BRANCH" "origin/${HEAD_BRANCH}"
-          git push origin "$SYNC_BRANCH"
-          echo "continue=true" >> $GITHUB_OUTPUT
-
-      - name: Open PR
-        if: steps.push.outputs.continue
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          BODY: |
-            Please do a **normal merge**, not squash merge.
-            Please fix conflicts if necessary.
-
-            ---
-
-            Triggered by `${{ github.event_name }}`
-        run: |
-          url="$(
-            gh pr create --head "$SYNC_BRANCH" \
-            --title "🤖 Merge ${SYNC_BRANCH} into master" \
-            --body "$BODY"
-          )"
-          echo "::notice::PR created at ${url}"
-
-          gh pr edit "$SYNC_BRANCH" --add-label "sync" || true
+    uses: cylc/release-actions/.github/workflows/branch-sync.yml@v1
+    with:
+      head_branch: ${{ inputs.head_branch }}
+    secrets: inherit