diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 518f6583..875add3e 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -125,6 +125,7 @@ jobs:
         with:
           set-safe-directory: true
           repository: open-quantum-safe/liboqs
+          ref: 0.9.1
           path: liboqs
       - uses: ilammy/msvc-dev-cmd@v1
         with:
@@ -237,6 +238,7 @@ jobs:
           with:
             set-safe-directory: true
             repository: open-quantum-safe/liboqs
+            ref: 0.9.1
             path: liboqs
         - uses: ilammy/msvc-dev-cmd@v1
           with: