diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 453bfc2..af66552 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,14 +16,18 @@ jobs:
         ocaml-compiler:
           - 5.2.x
           - 4.14.x
-          - 4.11.x
+          - 4.13.x
+          - 4.12.x
         include:
+          # OCaml 4.11.x: skipping macos & windows (fail)
+          - ocaml-compiler: 4.11.x
+            os: ubuntu-latest
           # OCaml 4.10.x: skipping windowns (fail)
           - ocaml-compiler: 4.10.x
             os: ubuntu-latest
           - ocaml-compiler: 4.10.x
             os: macos-latest
-          # OCaml 4.08.x: ubuntu-latest only as macos & windows fail
+          # OCaml 4.08.x: skipping macos & windows (fail)
           # Keep the minimal version of OCaml in sync in here, `dune-project`
           # and `dune-workspace.dev`.
           - ocaml-compiler: 4.08.x