diff --git a/bellows/ezsp/__init__.py b/bellows/ezsp/__init__.py
index e4441486..b5bd087f 100644
--- a/bellows/ezsp/__init__.py
+++ b/bellows/ezsp/__init__.py
@@ -29,11 +29,11 @@
 import bellows.types as t
 import bellows.uart
 
-from . import v4, v5, v6, v7, v8, v9, v10, v11, v12, v13, v14, v16, v17
+from . import v4, v5, v6, v7, v8, v9, v10, v11, v12, v13, v14, v16, v17, v18
 
 RESET_ATTEMPTS = 3
 
-EZSP_LATEST = v17.EZSPv17.VERSION
+EZSP_LATEST = v18.EZSPv18.VERSION
 LOGGER = logging.getLogger(__name__)
 MTOR_MIN_INTERVAL = 60
 MTOR_MAX_INTERVAL = 3600
@@ -61,6 +61,7 @@ class EZSP:
         v14.EZSPv14.VERSION: v14.EZSPv14,
         v16.EZSPv16.VERSION: v16.EZSPv16,
         v17.EZSPv17.VERSION: v17.EZSPv17,
+        v18.EZSPv18.VERSION: v18.EZSPv18,
     }
 
     def __init__(self, device_config: dict, application: Any | None = None):
diff --git a/bellows/ezsp/config.py b/bellows/ezsp/config.py
index 1045da0f..61e485ce 100644
--- a/bellows/ezsp/config.py
+++ b/bellows/ezsp/config.py
@@ -129,4 +129,5 @@ class ValueConfig:
     14: DEFAULT_CONFIG_NEW,
     16: DEFAULT_CONFIG_NEW,
     17: DEFAULT_CONFIG_NEW,
+    18: DEFAULT_CONFIG_NEW,
 }
diff --git a/bellows/ezsp/v18/__init__.py b/bellows/ezsp/v18/__init__.py
new file mode 100644
index 00000000..f087a8d1
--- /dev/null
+++ b/bellows/ezsp/v18/__init__.py
@@ -0,0 +1,20 @@
+""""EZSP Protocol version 18 protocol handler."""
+from __future__ import annotations
+
+import voluptuous as vol
+
+import bellows.config
+
+from . import commands, config
+from ..v17 import EZSPv17
+
+
+class EZSPv18(EZSPv17):
+    """EZSP Version 18 Protocol version handler."""
+
+    VERSION = 18
+    COMMANDS = commands.COMMANDS
+    SCHEMAS = {
+        bellows.config.CONF_EZSP_CONFIG: vol.Schema(config.EZSP_SCHEMA),
+        bellows.config.CONF_EZSP_POLICIES: vol.Schema(config.EZSP_POLICIES_SCH),
+    }
diff --git a/bellows/ezsp/v18/commands.py b/bellows/ezsp/v18/commands.py
new file mode 100644
index 00000000..ff458c4c
--- /dev/null
+++ b/bellows/ezsp/v18/commands.py
@@ -0,0 +1,18 @@
+import bellows.types as t
+
+from ..v17.commands import COMMANDS as COMMANDS_v17
+
+COMMANDS = {
+    **COMMANDS_v17,
+    "macFilterMatchMessageHandler": (
+        0x46,
+        {},
+        {
+            "filterValueMatch": t.uint16_t,  # Was `filterIndexMatch: uint8_t`
+            "legacyPassthroughType": t.EmberMacPassthroughType,
+            "lastHopLqi": t.uint8_t,
+            "lastHopRssi": t.int8s,
+            "messageContents": t.LVBytes,
+        },
+    ),
+}
diff --git a/bellows/ezsp/v18/config.py b/bellows/ezsp/v18/config.py
new file mode 100644
index 00000000..167fa57a
--- /dev/null
+++ b/bellows/ezsp/v18/config.py
@@ -0,0 +1,16 @@
+import voluptuous as vol
+
+from bellows.config import cv_uint16
+from bellows.types import EzspPolicyId
+
+from ..v4.config import EZSP_POLICIES_SHARED
+from ..v17 import config as v17_config
+
+EZSP_SCHEMA = {
+    **v17_config.EZSP_SCHEMA,
+}
+
+EZSP_POLICIES_SCH = {
+    **EZSP_POLICIES_SHARED,
+    **{vol.Optional(policy.name): cv_uint16 for policy in EzspPolicyId},
+}
diff --git a/tests/test_ezsp.py b/tests/test_ezsp.py
index b3e24821..d548309a 100644
--- a/tests/test_ezsp.py
+++ b/tests/test_ezsp.py
@@ -951,21 +951,20 @@ async def test_cfg_initialize_skip():
         )
 
 
-@pytest.mark.parametrize("unsupported_version", [15, 18, 99])
-async def test_unsupported_ezsp_version_startup(unsupported_version: int, caplog):
+async def test_unsupported_ezsp_version_startup(caplog):
     """Test that startup works with an unsupported EZSP version."""
-    ezsp = make_ezsp(version=unsupported_version)
+    ezsp = make_ezsp(version=99)
 
     with patch("bellows.uart.connect"):
         await ezsp.connect()
 
     # The EZSP version should be stored as the unsupported version
-    assert ezsp._ezsp_version == unsupported_version
+    assert ezsp._ezsp_version == 99
 
     # But the protocol should fall back to the latest
     assert ezsp._protocol.VERSION == EZSP_LATEST
 
-    assert f"Protocol version {unsupported_version} is not supported" in caplog.text
+    assert "Protocol version 99 is not supported" in caplog.text
 
     ezsp.getConfigurationValue = AsyncMock(return_value=(t.EzspStatus.SUCCESS, 0))
     ezsp.setConfigurationValue = AsyncMock(return_value=(t.EzspStatus.SUCCESS,))
diff --git a/tests/test_ezsp_v18.py b/tests/test_ezsp_v18.py
new file mode 100644
index 00000000..b0c8c90e
--- /dev/null
+++ b/tests/test_ezsp_v18.py
@@ -0,0 +1,31 @@
+from unittest.mock import MagicMock
+
+import pytest
+
+import bellows.ezsp.v18
+import bellows.types as t
+
+from tests.common import mock_ezsp_commands
+
+
+@pytest.fixture
+def ezsp_f():
+    """EZSP v18 protocol handler."""
+    ezsp = bellows.ezsp.v18.EZSPv18(MagicMock(), MagicMock())
+    mock_ezsp_commands(ezsp)
+
+    return ezsp
+
+
+def test_ezsp_frame(ezsp_f):
+    ezsp_f._seq = 0x22
+    data = ezsp_f._ezsp_frame("version", 18)
+    assert data == b"\x22\x00\x01\x00\x00\x12"
+
+
+def test_ezsp_frame_rx(ezsp_f):
+    """Test receiving a version frame."""
+    ezsp_f(b"\x01\x01\x80\x00\x00\x01\x02\x34\x12")
+    assert ezsp_f._handle_callback.call_count == 1
+    assert ezsp_f._handle_callback.call_args[0][0] == "version"
+    assert ezsp_f._handle_callback.call_args[0][1] == [0x01, 0x02, 0x1234]