diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8b13249..2a6cdfb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,6 +10,7 @@ jobs:
         os:
           - ubuntu-latest
         ocaml:
+          - 5.1.x
           - 4.14.x
           - 4.08.x
     steps: