diff --git a/.github/workflows/windows-selftest.yml b/.github/workflows/windows-selftest.yml
index 37d739d7c8..60da3b955d 100644
--- a/.github/workflows/windows-selftest.yml
+++ b/.github/workflows/windows-selftest.yml
@@ -37,6 +37,10 @@ jobs:
       cancel-in-progress: true
 
     steps:
+      - name: Cleanup
+        shell: powershell
+        run: Remove-Item -Recurse -Force ${{ github.workspace }}\*
+
       - name: Checkout code
         uses: actions/checkout@v4
 
@@ -60,6 +64,12 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-meteor-
 
+      - name: Reset submodules (force refetch)
+        shell: pwsh
+        run: |
+          git submodule deinit -f --all
+          if (Test-Path ".git/modules") { Remove-Item -Recurse -Force ".git/modules" }
+
       - name: Install dependencies
         shell: pwsh
         run: |