diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f43ca8d..dda46c0 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -17,13 +17,14 @@ jobs:
           - ubuntu-latest
           - windows-latest
         ocaml-compiler:
-          - 4.12.x
+          - 4.06.x
+          - 4.14.x
 
     runs-on: ${{ matrix.os }}
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Use OCaml ${{ matrix.ocaml-compiler }}
         uses: ocaml/setup-ocaml@v2