diff --git a/.github/workflows/failsafe_sim.yml b/.github/workflows/failsafe_sim.yml
index 037e70747d..044c613b5d 100644
--- a/.github/workflows/failsafe_sim.yml
+++ b/.github/workflows/failsafe_sim.yml
@@ -43,6 +43,7 @@ jobs:
         run: |
           git clone https://github.com/emscripten-core/emsdk.git _emscripten_sdk
           cd _emscripten_sdk
+          git checkout 4.0.15
           ./emsdk install latest
           ./emsdk activate latest