diff --git a/.github/workflows/emsdk.yml b/.github/workflows/emsdk.yml
index 0bf249b..40dd343 100644
--- a/.github/workflows/emsdk.yml
+++ b/.github/workflows/emsdk.yml
@@ -68,10 +68,14 @@ jobs:
             build_em/infinisim.js
             build_em/infinisim.wasm
 
+      # using https://github.com/gzuidhof/coi-serviceworker to get Cross-origin isolation on gh-pages
+      # otherwise the error 'Uncaught ReferenceError: SharedArrayBuffer is not defined' will be shown
       - name: Prepare Github Page
         shell: bash
         run: |
           mkdir emscripten
+          curl -o emscripten/coi-serviceworker.js https://raw.githubusercontent.com/gzuidhof/coi-serviceworker/ed2fbe98a222b8e0991a839f504137408d56d2e6/coi-serviceworker.js
+          sed -i -e 's#</body>#<script src="coi-serviceworker.js"></script></body>#' build_em/infinisim.html
           mv build_em/infinisim.html \
             build_em/infinisim.js \
             build_em/infinisim.wasm \