diff --git a/elkm1_lib/const.py b/elkm1_lib/const.py
index 0ef0e38..d07b0be 100644
--- a/elkm1_lib/const.py
+++ b/elkm1_lib/const.py
@@ -128,6 +128,7 @@ class AlarmState(Enum):
     WATER_ALARM = "@"
     FIRE_SUPERVISORY = "A"
     VERIFY_FIRE = "B"
+    UNSUPERVISED_ZONE_TROUBLE = "U"
 
 
 class ArmLevel(Enum):
diff --git a/pyproject.toml b/pyproject.toml
index 307ec75..a089a79 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "elkm1-lib"
-version = "2.2.10"
+version = "2.2.11"
 description = "Library for interacting with ElkM1 alarm/automation panel."
 readme = "README.md"
 requires-python = ">= 3.11"
diff --git a/uv.lock b/uv.lock
index b931c7b..96fdd9e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -55,7 +55,7 @@ wheels = [
 
 [[package]]
 name = "elkm1-lib"
-version = "2.2.10"
+version = "2.2.11"
 source = { editable = "." }
 dependencies = [
     { name = "pyserial-asyncio-fast" },