diff --git a/.github/workflows/ocaml.yml b/.github/workflows/ocaml.yml
index 6a0cfba..d1b6923 100644
--- a/.github/workflows/ocaml.yml
+++ b/.github/workflows/ocaml.yml
@@ -13,7 +13,7 @@ jobs:
             with-doc: true
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: RedPRL/actions-ocaml@v2
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}