diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index e8126d9..3ec62c3 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -17,14 +17,7 @@ jobs:
       matrix:
         os: [macos-latest, ubuntu-latest, windows-latest]
         ocaml:
-          - ocaml-base-compiler.5.0.0~alpha0
-          - 4.14.0
-        include:
-          - {os: ubuntu-latest, ocaml: 4.13.1}
-          - {os: ubuntu-latest, ocaml: 4.12.1}
-          - {os: ubuntu-latest, ocaml: 4.11.2}
-        exclude:
-          - {os: windows-latest, ocaml: ocaml-base-compiler.5.0.0~alpha0}
+          - ocaml-base-compiler.5.1.0
 
     runs-on: ${{ matrix.os }}