diff --git a/.github/workflows/build-multiplatform.yml b/.github/workflows/build-multiplatform.yml
index 1abc453..053470d 100644
--- a/.github/workflows/build-multiplatform.yml
+++ b/.github/workflows/build-multiplatform.yml
@@ -32,6 +32,9 @@ jobs:
       - name: Build engine and bootstrapper
         run: |
           python build.py --no-zip
+      - name: Install Windows SDK (signtool)
+        run: |
+          choco install windows-sdk-10-version-2004-all
       - name: Decode PFX certificate
         run: |
           echo "${{ secrets.CODESIGN_PFX }}" | Out-File -Encoding ascii -FilePath cert_base64.txt