diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index c27a4b9d..cc3394dc 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -48,18 +48,19 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - ubuntu-latest
-          - macos-latest
-          - windows-latest
+          - ubuntu-24.04
+          - ubuntu-24.04-arm
+          - macos-15
+          - windows-2025
         ocaml-compiler:
           - "5.3"
         allow-prerelease-opam:
           - false
         include:
-          - os: ubuntu-latest
+          - os: ubuntu-24.04
             ocaml-compiler: ocaml-variants.5.3.0+options,ocaml-option-flambda
             allow-prerelease-opam: false
-          - os: ubuntu-latest
+          - os: ubuntu-24.04
             ocaml-compiler: "5.3"
             allow-prerelease-opam: true