diff --git a/.github/workflows/nightly-testing.yml b/.github/workflows/nightly-testing.yml
index 83d9d49b8..a9b21288a 100644
--- a/.github/workflows/nightly-testing.yml
+++ b/.github/workflows/nightly-testing.yml
@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Use OCaml ${{ matrix.ocaml-compiler }}
-        uses: ocaml/setup-ocaml@v2
+        uses: ocaml/setup-ocaml@master
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
           dune-cache: true