diff --git a/.github/workflows/deploy-doc.yml b/.github/workflows/deploy-doc.yml
index 66b27ab..e16b269 100644
--- a/.github/workflows/deploy-doc.yml
+++ b/.github/workflows/deploy-doc.yml
@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Checkout tree
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set-up OCaml
         uses: ocaml/setup-ocaml@v3