diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index 8edac90..67a8b2f 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -29,6 +29,7 @@ jobs:
           ocaml-compiler: ${{ matrix.ocaml-version }}
           dune-cache: true
           opam-depext-flags: "--with-test"
+          allow-prerelease-opam: true
 
       - run: opam install . --deps-only --with-test
 
@@ -49,6 +50,7 @@ jobs:
         with:
           ocaml-compiler: 5.1
           dune-cache: true
+          allow-prerelease-opam: true
 
       - name: Lint fmt
         uses: ocaml/setup-ocaml/lint-fmt@v2
@@ -64,6 +66,7 @@ jobs:
         with:
           ocaml-compiler: 5.1
           dune-cache: true
+          allow-prerelease-opam: true
 
       - name: Lint opam
         uses: ocaml/setup-ocaml/lint-opam@v2
@@ -80,6 +83,7 @@ jobs:
           ocaml-compiler: 5.1
           dune-cache: true
           opam-depext-flags: "--with-doc"
+          allow-prerelease-opam: true
 
       - name: Deploy odoc to GitHub Pages
         uses: ocaml/setup-ocaml/deploy-doc@v2
@@ -96,6 +100,7 @@ jobs:
           ocaml-compiler: 5.1
           dune-cache: true
           opam-depext-flags: "--with-doc"
+          allow-prerelease-opam: true
 
       - name: Lint doc
         uses: ocaml/setup-ocaml/lint-doc@v2
@@ -111,6 +116,7 @@ jobs:
         with:
           ocaml-compiler: 5.1
           dune-cache: true
+          allow-prerelease-opam: true
 
       - name: Opam Dependency Submission
         uses: ocaml/setup-ocaml/analysis@v2