diff --git a/pyproject.toml b/pyproject.toml
index 508e9c2f..d60bc7e7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ classifiers = [
 dependencies = [
     "PyYAML",
     "appdirs",
-    "build",
+    "build>=1",
     "psygnal>=0.3.0",
     "pydantic<2",
     "tomli-w",
diff --git a/src/npe2/_inspection/_fetch.py b/src/npe2/_inspection/_fetch.py
index d6577b96..95a18826 100644
--- a/src/npe2/_inspection/_fetch.py
+++ b/src/npe2/_inspection/_fetch.py
@@ -41,7 +41,6 @@
     "fetch_manifest",
     "get_pypi_url",
     "get_hub_plugin",
-    "get_hub_plugins",
     "get_pypi_plugins",
 ]
 
@@ -405,13 +404,6 @@ def get_pypi_plugins() -> Dict[str, str]:
     return _get_packages_by_classifier(NAPARI_CLASSIFIER)
 
 
-@lru_cache
-def get_hub_plugins() -> Dict[str, str]:
-    """Return {name: latest_version} for all plugins on the hub."""
-    with request.urlopen("https://api.napari-hub.org/plugins") as r:
-        return json.load(r)
-
-
 @lru_cache
 def get_hub_plugin(plugin_name: str) -> Dict[str, Any]:
     """Return hub information for a specific plugin."""
diff --git a/src/npe2/_inspection/_full_install.py b/src/npe2/_inspection/_full_install.py
index 32862ee1..27f59cdc 100644
--- a/src/npe2/_inspection/_full_install.py
+++ b/src/npe2/_inspection/_full_install.py
@@ -58,9 +58,9 @@ def isolated_plugin_env(
     """
     # it's important that this import be lazy, otherwise we'll get a circular
     # import when serving as a setuptools plugin with `python -m build`
-    from build.env import IsolatedEnvBuilder
+    from build.env import DefaultIsolatedEnv
 
-    with IsolatedEnvBuilder() as env:
+    with DefaultIsolatedEnv() as env:
         # install the package
         pkg = f"{package}=={version}" if version else package
         logger.debug(f"installing {pkg} into virtual env")
diff --git a/tests/test_fetch.py b/tests/test_fetch.py
index 48f7fee8..6f03f377 100644
--- a/tests/test_fetch.py
+++ b/tests/test_fetch.py
@@ -9,7 +9,6 @@
 from npe2._inspection._fetch import (
     _manifest_from_pypi_sdist,
     get_hub_plugin,
-    get_hub_plugins,
     get_manifest_from_wheel,
     get_pypi_plugins,
     get_pypi_url,
@@ -93,11 +92,6 @@ def test_get_manifest_from_wheel(tmp_path):
     assert mf.name == "affinder"
 
 
-def test_get_hub_plugins():
-    plugins = get_hub_plugins()
-    assert len(plugins) > 0
-
-
 def test_get_hub_plugin():
     info = get_hub_plugin("napari-svg")
     assert info["name"] == "napari-svg"