diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index b4c471b4..07a516ac 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,7 +16,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        python-version: [3.9, 3.11, 3.12]
+        python-version: [3.10, 3.11, 3.12, 3.13]
 
     steps:
     - name: Checkout nglview repository
diff --git a/devtools/release.py b/devtools/release.py
index 9d43898e..15f5c7d8 100755
--- a/devtools/release.py
+++ b/devtools/release.py
@@ -25,6 +25,4 @@
 output = subprocess.check_output(["npm", "search", "nglview-js-widgets"]).decode()
 print(output)
 
-subprocess.check_call('cd nglview/labextension && git clean -fdx .', shell=True)
-subprocess.check_call('cd js && npm install && npm run copy:labextension', shell=True)
 subprocess.check_call('python setup.py sdist', shell=True)