diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4dab254..c8983d2 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -20,7 +20,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2
-    - uses: ocaml/setup-ocaml@master
+    - uses: ocaml/setup-ocaml@v2
       with:
         ocaml-compiler: ${{ matrix.ocaml-compiler }}
         dune-cache: true