diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index af64d1c38..d7b4267bf 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -61,21 +61,21 @@ jobs:
               *.opam
               !lwt_ppx.opam
           - os: ubuntu-latest
-            ocaml-compiler: 4.02.x
-            libev: false
+            ocaml-compiler: 4.03.x
+            libev: true
             ppx: false
             local-packages: |
               *.opam
               !lwt_ppx.opam
-          - os: ubuntu-latest
-            ocaml-compiler: 4.03.x
+          - os: macos-latest
+            ocaml-compiler: 4.02.x
             libev: true
             ppx: false
             local-packages: |
               *.opam
               !lwt_ppx.opam
-          - os: ubuntu-latest
-            ocaml-compiler: 4.03.x
+          - os: windows-latest
+            ocaml-compiler: 4.02.x
             libev: false
             ppx: false
             local-packages: |