diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 52ef197ad1f..09d380362ae 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -30,6 +30,13 @@ jobs:
         ocaml-compiler:
           - 4.14.x
         include:
+          # OCaml trunk:
+          - ocaml-compiler: ocaml-variants.5.1.0+trunk
+            os: ubuntu-latest
+            skip_test: true
+          - ocaml-compiler: ocaml-variants.5.1.0+trunk
+            os: macos-latest
+            skip_test: true
           # OCaml 5:
           - ocaml-compiler: 5.0.x
             os: ubuntu-latest