diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 18a790a..4dab254 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,6 +16,7 @@ jobs:
         ocaml-compiler:
           - 4.08.x
           - 4.12.x
+          - 5.1.x
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2