diff --git a/.github/workflows/nightly-6.yml b/.github/workflows/nightly-6.yml
deleted file mode 100644
index dadee170..00000000
--- a/.github/workflows/nightly-6.yml
+++ /dev/null
@@ -1,23 +0,0 @@
----
-name: "nightly-6"
-on:
-    schedule:
-        - cron: '42 5 * * *'
-    workflow_dispatch:
-
-jobs:
-    nightly-7:
-        name: "dispatch-nightly-6"
-        runs-on: ubuntu-22.04
-        permissions: write-all
-        steps:
-            - name: Checkout '6'
-              uses: actions/checkout@v4
-              with:
-                  ref: '6'
-
-            - name: Execute 'ci.yml' on '6'
-              env:
-                  GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-              run: |
-                  gh workflow run ci.yml --ref 6