diff --git a/.github/workflows/ocaml-lsp-compat.yml b/.github/workflows/ocaml-lsp-compat.yml
index 9153eeac9..ba836a9b4 100644
--- a/.github/workflows/ocaml-lsp-compat.yml
+++ b/.github/workflows/ocaml-lsp-compat.yml
@@ -34,7 +34,7 @@ jobs:
         os:
           - ubuntu-latest
         ocaml-compiler:
-          - 5.2.x
+          - ocaml-base-compiler.5.3.0~alpha1
     # The type of runner that the job will run on
     runs-on: ${{ matrix.os }}
 
@@ -52,6 +52,6 @@ jobs:
       - name: Check that Merlin and OCaml-LSP are co-installable
         run: |
           opam --cli=2.1 pin --with-version=dev --no-action https://github.com/voodoos/ocaml-lsp.git#merlin-503-compat
-          opam --cli=2.1 pin --with-version=5.0-502 --no-action .
-          opam install ocaml-lsp-server --with-test --ignore-constraints-on=ocamlformat
+          opam --cli=2.1 pin --with-version=5.3-503 --no-action .
+          opam install ocaml-lsp-server --ignore-constraints-on=ocamlformat