diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 8981f395e3d..8c5aacf9c44 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -213,7 +213,7 @@ jobs:
         run: sudo apt update
 
       - name: Use OCaml ${{ matrix.ocaml-compiler }}
-        uses: ocaml/setup-ocaml@v3
+        uses: anmonteiro/setup-ocaml@patch-1
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
 
@@ -388,6 +388,7 @@ jobs:
       - name: Setup Cygwin
         uses: cygwin/cygwin-install-action@v6
         with:
+          site: https://mirrors.sonic.net/cygwin/
           packages: ocaml gcc-core make
       - name: Bootstrap Dune
         run: make bootstrap