diff --git a/.github/workflows/javascript_builds.yml b/.github/workflows/javascript_builds.yml
index 3785632ec..3ff96766a 100644
--- a/.github/workflows/javascript_builds.yml
+++ b/.github/workflows/javascript_builds.yml
@@ -5,7 +5,7 @@ on: [push, pull_request]
 env:
   PANDEMONIUM_BASE_BRANCH: master
   SCONSFLAGS: verbose=yes warnings=all debug_symbols=no werror=yes 
-  EM_VERSION: 3.1.10
+  EM_VERSION: 3.1.20
   EM_CACHE_FOLDER: "emsdk-cache"
 
 concurrency:
diff --git a/platform/javascript/detect.py b/platform/javascript/detect.py
index d82f7e2b9..5189f5af9 100644
--- a/platform/javascript/detect.py
+++ b/platform/javascript/detect.py
@@ -151,9 +151,9 @@ def configure(env):
     env["ARCOM_POSIX"] = env["ARCOM"].replace("$TARGET", "$TARGET.posix").replace("$SOURCES", "$SOURCES.posix")
     env["ARCOM"] = "${TEMPFILE(ARCOM_POSIX)}"
 
-    # All intermediate files are just LLVM bitcode.
+    # All intermediate files are just object files.
     env["OBJPREFIX"] = ""
-    env["OBJSUFFIX"] = ".bc"
+    env["OBJSUFFIX"] = ".o"
     env["PROGPREFIX"] = ""
     # Program() output consists of multiple files, so specify suffixes manually at builder.
     env["PROGSUFFIX"] = ""