diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d47c1865..65325c61 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -30,6 +30,7 @@ jobs:
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
           dune-cache: true
+          allow-prerelease-opam: true
 
       - run: opam install -t moonpool --deps-only
       - run: opam exec -- dune build @install