diff --git a/docs/build-environment.yml b/docs/build-environment.yml
index 134b566..9e2c019 100644
--- a/docs/build-environment.yml
+++ b/docs/build-environment.yml
@@ -13,6 +13,6 @@ dependencies:
   - jupyterlab
   - empack >=2.0.9,<3
   - pip:
-    - jupyterlite-core==0.1.0b19
+    - jupyterlite-core==0.1.0b20
     - jupyterlite-sphinx
     - ..
diff --git a/docs/jupyter-lite.json b/docs/jupyter-lite.json
deleted file mode 100644
index 5cd5f91..0000000
--- a/docs/jupyter-lite.json
+++ /dev/null
@@ -1,8 +0,0 @@
-{
-  "jupyter-lite-schema-version": 0,
-  "jupyter-config-data": {
-    "disabledExtensions": [
-      "@jupyterlite/javascript-kernel-extension"
-    ]
-  }
-}
diff --git a/setup.py b/setup.py
index d747937..1441469 100644
--- a/setup.py
+++ b/setup.py
@@ -59,14 +59,14 @@
     packages=setuptools.find_packages(exclude=["tests"]),
     install_requires=[
         "traitlets",
-        "jupyterlite-core>=0.1.0b19",
+        "jupyterlite-core>=0.1.0b20",
         "requests",
         "empack>=2.0.9,<3",
         "typer",
     ],
     zip_safe=False,
     include_package_data=True,
-    python_requires=">=3.6",
+    python_requires=">=3.8",
     platforms="Linux, Mac OS X, Windows",
     keywords=["Jupyter", "JupyterLab", "JupyterLab3"],
     classifiers=[