diff --git a/.github/workflows/ci-interpreter.yml b/.github/workflows/ci-interpreter.yml
index 6edfa0c4..6ca5db55 100644
--- a/.github/workflows/ci-interpreter.yml
+++ b/.github/workflows/ci-interpreter.yml
@@ -19,16 +19,21 @@ jobs:
       - name: Checkout repo
         uses: actions/checkout@v2
       - name: Setup OCaml
-        uses: ocaml/setup-ocaml@v2
+        uses: ocaml/setup-ocaml@v3
         with:
           ocaml-compiler: 4.12.x
       - name: Setup OCaml tools
-        run: opam install --yes ocamlbuild.0.14.0 ocamlfind.1.9.5 js_of_ocaml.4.0.0 js_of_ocaml-ppx.4.0.0
-      - name: Setup Node.js
-        uses: actions/setup-node@v2
-        with:
-          node-version: 19.x
+        run: opam install --yes ocamlfind.1.9.5 js_of_ocaml.4.0.0 js_of_ocaml-ppx.4.0.0
       - name: Build interpreter
         run: cd interpreter && opam exec make
+      # Neither V8 nor SpiderMonkey can currently handle all 3.0 tests, so we disable checking JS translation for now.
+      #- name: Setup Node.js
+      #  uses: actions/setup-node@v4
+      #  with:
+      #    node-version: 25-nightly
+      #- name: Setup SpiderMonkey
+      #  run: curl -O https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/jsshell-linux-x86_64.zip && unzip jsshell-linux-x86_64.zip
       - name: Run tests
-        run: cd interpreter && opam exec make JS=node ci
+        run: cd interpreter && opam exec make ci           # don't test JS translation
+      # run: cd interpreter && opam exec make JS=node ci   # test with V8
+      # run: cd interpreter && opam exec make JS=../js ci  # test with SM
diff --git a/test/core/run.py b/test/core/run.py
index 2aa93b30..517b705f 100755
--- a/test/core/run.py
+++ b/test/core/run.py
@@ -113,8 +113,7 @@ def _runTestFile(self, inputPath):
 
 
 if __name__ == "__main__":
-  if not os.path.exists(outputDir):
-    os.makedirs(outputDir)
+  os.makedirs(outputDir, exist_ok=True)
   for fileName in inputFiles:
     testName = 'test ' + os.path.basename(fileName)
     setattr(RunTests, testName, lambda self, file=fileName: self._runTestFile(file))