diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 078ff14..af79b22 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -24,10 +24,10 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@master
+        uses: actions/checkout@v2
 
       - name: Use OCaml ${{ matrix.ocaml-version }}
-        uses: avsm/setup-ocaml@v1.0.1
+        uses: avsm/setup-ocaml@v1
         with:
           ocaml-version: ${{ matrix.ocaml-version }}