diff --git a/.github/workflows/test-old-branches.yml b/.github/workflows/test-old-branches.yml
index 9e37c8b5e6667..7a5b9c9f52033 100644
--- a/.github/workflows/test-old-branches.yml
+++ b/.github/workflows/test-old-branches.yml
@@ -16,6 +16,9 @@ on:
 # Any needed permissions should be configured at the job level.
 permissions: {}
 
+env:
+  CURRENTLY_SUPPORTED_BRANCH: '6.3'
+
 jobs:
   dispatch-workflows-for-old-branches:
     name: ${{ matrix.workflow }} for ${{ matrix.branch }}
@@ -85,7 +88,7 @@ jobs:
     steps:
       - name: Dispatch workflow run
         uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410 # v6.4.1
-        if: ${{ github.event_name == 'push' || github.event.schedule == '0 0 15 * *' || matrix.branch == '6.3' }}
+        if: ${{ github.event_name == 'push' || github.event.schedule == '0 0 15 * *' || matrix.branch == env.CURRENTLY_SUPPORTED_BRANCH }}
         with:
           retries: 2
           retry-exempt-status-codes: 418