diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 15c1877de..af0d308c3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -75,7 +75,7 @@ jobs:
           cd emsdk
 
           # Download and install the latest SDK tools.
-          ./emsdk install latest-upstream
+          ./emsdk install 3.1.65
 
           # Make the "latest" SDK "active" for the current user. (writes .emscripten file)
           ./emsdk activate latest