diff --git a/archivebox/services/machine_service.py b/archivebox/services/machine_service.py
index 7367f58c..1d0ba1c4 100644
--- a/archivebox/services/machine_service.py
+++ b/archivebox/services/machine_service.py
@@ -29,6 +29,10 @@ class MachineService(BaseService):
             key = event.key.replace("config/", "", 1).strip()
             if key:
                 config[key] = event.value
+        elif event.method == "unset":
+            key = event.key.replace("config/", "", 1).strip()
+            if key:
+                config.pop(key, None)
         else:
             return
 
diff --git a/archivebox/tests/test_runner.py b/archivebox/tests/test_runner.py
index 32ba1afd..d335e225 100644
--- a/archivebox/tests/test_runner.py
+++ b/archivebox/tests/test_runner.py
@@ -466,6 +466,15 @@ def test_machine_service_persists_only_derived_config_events(tmp_path):
             )
             await derived_event.now()
             await derived_event.event_results_list()
+            unset_event = bus.emit(
+                MachineEvent(
+                    method="unset",
+                    key="config/WGET_BINARY",
+                    config_type="derived",
+                ),
+            )
+            await unset_event.now()
+            await unset_event.event_results_list()
             await bus.wait_until_idle()
         finally:
             await bus.destroy()
@@ -474,7 +483,6 @@ def test_machine_service_persists_only_derived_config_events(tmp_path):
 
     machine.refresh_from_db()
     assert machine.config == {
-        "WGET_BINARY": str(wget_binary),
         "ABX_INSTALL_CACHE": {"wget": "2026-03-24T00:00:00+00:00"},
     }
 
diff --git a/pyproject.toml b/pyproject.toml
index 527d9c5b..72f20269 100755
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -80,8 +80,8 @@ dependencies = [
     ### Binary/Package Management
     "abxbus>=2.5.4",          # EventBus API
     "abxpkg>=1.10.7",         # for: detecting, versioning, and installing binaries via apt/brew/pip/npm
-    "abx-plugins>=1.10.69",   # shared ArchiveBox plugin package with Chrome/Puppeteer dependency wiring
-    "abx-dl>=1.10.69",        # shared ArchiveBox downloader package with blocking install preflight
+    "abx-plugins>=1.10.70",   # shared ArchiveBox plugin package with Chrome/Puppeteer dependency wiring
+    "abx-dl>=1.10.70",        # shared ArchiveBox downloader package with blocking install preflight
     ### UUID7 backport for Python <3.14
     "uuid7>=0.1.0; python_version < '3.14'",  # provides the uuid_extensions module on Python 3.13
 ]