diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 2742684..351ab3f 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -20,7 +20,7 @@ jobs:
       - name: Set-up OCaml
         uses: ocaml/setup-ocaml@v3
         with:
-          ocaml-compiler: 4
+          ocaml-compiler: 5
       - run: corepack enable
       - run: yarn install --immutable
       - run: opam install . --deps-only
@@ -35,7 +35,7 @@ jobs:
       - name: Set-up OCaml
         uses: ocaml/setup-ocaml@v3
         with:
-          ocaml-compiler: 4
+          ocaml-compiler: 5
       - uses: ocaml/setup-ocaml/lint-fmt@v3
 
   lint-opam:
@@ -46,5 +46,5 @@ jobs:
       - name: Set-up OCaml
         uses: ocaml/setup-ocaml@v3
         with:
-          ocaml-compiler: 4
+          ocaml-compiler: 5
       - uses: ocaml/setup-ocaml/lint-opam@v3