diff --git a/.binder/environment.yml b/.binder/environment.yml
index d1d75e6e..230688e8 100644
--- a/.binder/environment.yml
+++ b/.binder/environment.yml
@@ -1,36 +1,13 @@
-name: jupyterlab-fonts-dev
-
 channels:
   - conda-forge
-
+  - nodefaults
 dependencies:
-  # run
-  - jupyterlab >=3.4.8,<4
-  - python >=3.7,<3.11
-  # build
-  - brotlipy
-  - doit-with-toml
-  - fonttools
-  - nodejs >=18,<19
-  - pip
-  - twine
-  - wheel
-  # qa
-  - black
-  - flake8
-  - isort
-  # - ssort # only works on py3.8+
-  # utest
-  - pytest-cov
-  - pytest-html
-  # atest
-  - firefox =102
-  - geckodriver
-  - robotframework >=6
-  - robotframework-jupyterlibrary >=0.4.1
-  - robotframework-pabot
-  - robotframework-robocop >=2.6.0
-  - robotframework-tidy >=3.3.1
-  # demo toys
+  - conda <22.11.1
+  - conda-lock >=2.1.2,<2.2
+  - doitoml-with-all
+  - jupyter-collaboration
+  - jupyterlab >=4,<5
   - jupyterlab-link-share
-  - ipywidgets
+  - mamba
+  - python ==3.11.*
+  - python-dotenv
diff --git a/.binder/jupyter_config.json b/.binder/jupyter_config.json
deleted file mode 100644
index 8b40b06f..00000000
--- a/.binder/jupyter_config.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "LabApp": {
-    "collaborative": true
-  }
-}
diff --git a/.binder/overrides.json b/.binder/overrides.json
index 4593f1b6..e1191042 100644
--- a/.binder/overrides.json
+++ b/.binder/overrides.json
@@ -1,8 +1,5 @@
 {
   "@jupyterlab/apputils-extension:palette": {
     "modal": false
-  },
-  "@jupyterlab/extensionmanager-extension:plugin": {
-    "enabled": false
   }
 }
diff --git a/.binder/postBuild b/.binder/postBuild
index a8e39303..19a6e1c0 100755
--- a/.binder/postBuild
+++ b/.binder/postBuild
@@ -2,8 +2,17 @@
 set -eux
 source activate $NB_PYTHON_PREFIX
 
-doit binder
+doit dt:dist:flit
+
+python -m pip install \
+    -vv \
+    --find-links=dist \
+    --no-index-url \
+    --no-deps \
+    jupyterlab-fonts
 
-mkdir -p ~/.jupyter
-cp .binder/jupyter_config.json ~/.jupyter/
 cp .binder/overrides.json $NB_PYTHON_PREFIX/share/jupyter/lab/settings
+
+jupyter labextension disable @jupyterlab/extensionmanager-extension:plugin
+jupyter labextension disable @jupyterlab/apputils-extension:announcements
+jupyter labextension disable offlinenotebook
diff --git a/dodo.py b/dodo.py
index 646baefb..2a40ea9f 100644
--- a/dodo.py
+++ b/dodo.py
@@ -377,77 +377,3 @@ class P:
 #         actions=[[*C.JPY, "labextension", "list"]],
 #     )
 #     yield dict(name="all", task_dep=["binder:labextensions"], actions=[["echo", "ok"]])
-
-
-# def task_test():
-#     file_dep = [*P.ALL_ROBOT]
-#     task_dep = []
-
-#     if not C.CI:
-#         file_dep += [
-#             B.LABEXT / pkg_data["name"] / "package.json"
-#             for pkg_json, pkg_data in D.PKG_JSON_DATA.items()
-#             if pkg_json != P.META_PKG_JSON
-#         ]
-#         task_dep += ["setup"]
-
-#     targets = [B.ATEST_OUT / "log.html"]
-#     actions = [
-#         (doit.tools.create_folder, [B.ATEST_OUT]),
-#         doit.action.CmdAction(
-#             [
-#                 "pabot",
-#                 *C.PABOT_DEFAULTS,
-#                 *(["--name", "🇦"]),
-#                 *(["--variable", f"ATTEMPT:{1}"]),
-#                 *(["--variable", f"OS:{C.PLATFORM}"]),
-#                 *(["--variable", f"PY:{C.PY_VERSION}"]),
-#                 *(["--variable", f"ROBOCOV:{B.ROBOCOV}"]),
-#                 *(["--variable", f"ROOT:{P.ROOT}"]),
-#                 *C.ATEST_ARGS,
-#                 P.ATEST,
-#             ],
-#             shell=False,
-#             cwd=B.ATEST_OUT,
-#         ),
-#     ]
-
-#     if C.WITH_JS_COV:
-#         targets += [B.REPORTS_NYC_LCOV]
-#         actions = [
-#             (U.clean_some, [B.ROBOCOV, B.REPORTS_NYC]),
-#             (doit.tools.create_folder, [B.ROBOCOV]),
-#             *actions,
-#             [*C.NYC, f"--report-dir={B.REPORTS_NYC}", f"--temp-dir={B.ROBOCOV}"],
-#         ]
-
-#     yield dict(
-#         name="robot",
-#         actions=actions,
-#         targets=targets,
-#         file_dep=file_dep,
-#         task_dep=task_dep,
-#     )
-
-#     yield dict(
-#         name="pytest",
-#         task_dep=[] if C.TESTING_IN_CI else ["setup:ext"],
-#         file_dep=[*P.ALL_PY_SRC],
-#         actions=[
-#             [
-#                 "pytest",
-#                 "--pyargs",
-#                 P.PY_SRC.name,
-#                 f"--cov={P.PY_SRC.name}",
-#                 "--cov-branch",
-#                 "--no-cov-on-fail",
-#                 "--cov-fail-under=100",
-#                 "--cov-report=term-missing:skip-covered",
-#                 f"--cov-report=html:{B.HTMLCOV_HTML.parent}",
-#                 f"--html={B.PYTEST_HTML}",
-#                 "--self-contained-html",
-#                 f"--cov-report=xml:{B.PYTEST_COV_XML}",
-#             ]
-#         ],
-#         targets=[B.PYTEST_HTML, B.HTMLCOV_HTML, B.PYTEST_COV_XML],
-#     )