diff --git a/pyproject.toml b/pyproject.toml
index 3282633..77594dc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "drukbox-python-sdk"
-version = "0.4.0"
+version = "0.5.0"
 description = "Async Python client for Drukbox."
 readme = "README.md"
 license = "MIT"
diff --git a/src/drukbox_sdk/api.py b/src/drukbox_sdk/api.py
index 6d7664e..52116a6 100644
--- a/src/drukbox_sdk/api.py
+++ b/src/drukbox_sdk/api.py
@@ -198,7 +198,8 @@ class DoctorReport:
 
     ok: bool
     active_provider: str
-    tailscale_enabled: bool
+    # Whether the active provider's hosts join the tailnet.
+    tailnet: bool
     checks: list[DoctorCheck]
 
 
@@ -490,7 +491,8 @@ async def doctor(self) -> DoctorReport:
         return DoctorReport(
             ok=data["ok"],
             active_provider=data["active_provider"],
-            tailscale_enabled=data["tailscale_enabled"],
+            # drukbox before "Join the tailnet per provider" sent tailscale_enabled.
+            tailnet=data["tailnet"] if "tailnet" in data else data["tailscale_enabled"],
             checks=[DoctorCheck(**check) for check in data["checks"]],
         )
 
diff --git a/tests/test_api.py b/tests/test_api.py
index 4a7dacc..e999ffe 100644
--- a/tests/test_api.py
+++ b/tests/test_api.py
@@ -48,7 +48,7 @@ def _doctor_payload(**overrides: Any) -> dict[str, Any]:
     payload: dict[str, Any] = {
         "ok": True,
         "active_provider": "aws",
-        "tailscale_enabled": True,
+        "tailnet": True,
         "checks": [
             {
                 "name": "db",
@@ -925,6 +925,17 @@ def test_from_env_strips_trailing_slash_via_constructor(
     assert sandbox.base_url == "https://trailing.test"
 
 
+@respx.mock
+async def test_doctor_reads_tailscale_enabled_from_an_older_drukbox(api: SandboxAPI):
+    payload = _doctor_payload()
+    payload["tailscale_enabled"] = payload.pop("tailnet")
+    respx.get(f"{BASE_URL}/doctor").mock(return_value=httpx.Response(200, json=payload))
+
+    report = await api.doctor()
+
+    assert report.tailnet is True
+
+
 @respx.mock
 async def test_doctor_parses_report_and_checks(api: SandboxAPI):
     route = respx.get(f"{BASE_URL}/doctor").mock(
@@ -937,7 +948,7 @@ async def test_doctor_parses_report_and_checks(api: SandboxAPI):
     assert route.calls.last.request.headers["Authorization"] == "Bearer t-test"
     assert report.ok is True
     assert report.active_provider == "aws"
-    assert report.tailscale_enabled is True
+    assert report.tailnet is True
     assert [check.name for check in report.checks] == ["db", "provider", "tailscale"]
     provider = next(check for check in report.checks if check.name == "provider")
     assert provider.status == "ok"