diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index fe60d650ad..4ceafaf8b4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -59,7 +59,7 @@ jobs:
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
           opam-repositories: |
-            beta: https://github.com/ocaml/ocaml-beta-repository.git
+            beta: https://github.com/ocaml-opam/opam-repository-mingw.git#sunset
             default: https://github.com/ocaml/opam-repository.git
 
       - name: Install dependencies