diff --git a/bellows/__init__.py b/bellows/__init__.py
index 085b76d9..b9e8f38f 100644
--- a/bellows/__init__.py
+++ b/bellows/__init__.py
@@ -1,5 +1,5 @@
 MAJOR_VERSION = 0
 MINOR_VERSION = 35
-PATCH_VERSION = "4"
+PATCH_VERSION = "5"
 __short_version__ = f"{MAJOR_VERSION}.{MINOR_VERSION}"
 __version__ = f"{__short_version__}.{PATCH_VERSION}"
diff --git a/bellows/ezsp/__init__.py b/bellows/ezsp/__init__.py
index 25378b2e..2faa1c08 100644
--- a/bellows/ezsp/__init__.py
+++ b/bellows/ezsp/__init__.py
@@ -25,7 +25,7 @@
 
 from . import v4, v5, v6, v7, v8, v9, v10, v11
 
-EZSP_LATEST = v11.EZSP_VERSION
+EZSP_LATEST = v11.EZSPv11.VERSION
 PROBE_TIMEOUT = 3
 NETWORK_OPS_TIMEOUT = 10
 LOGGER = logging.getLogger(__name__)
@@ -39,21 +39,21 @@
 
 class EZSP:
     _BY_VERSION = {
-        v4.EZSP_VERSION: v4.EZSPv4,
-        v5.EZSP_VERSION: v5.EZSPv5,
-        v6.EZSP_VERSION: v6.EZSPv6,
-        v7.EZSP_VERSION: v7.EZSPv7,
-        v8.EZSP_VERSION: v8.EZSPv8,
-        v9.EZSP_VERSION: v9.EZSPv9,
-        v10.EZSP_VERSION: v10.EZSPv10,
-        v11.EZSP_VERSION: v11.EZSPv11,
+        v4.EZSPv4.VERSION: v4.EZSPv4,
+        v5.EZSPv5.VERSION: v5.EZSPv5,
+        v6.EZSPv6.VERSION: v6.EZSPv6,
+        v7.EZSPv7.VERSION: v7.EZSPv7,
+        v8.EZSPv8.VERSION: v8.EZSPv8,
+        v9.EZSPv9.VERSION: v9.EZSPv9,
+        v10.EZSPv10.VERSION: v10.EZSPv10,
+        v11.EZSPv11.VERSION: v11.EZSPv11,
     }
 
     def __init__(self, device_config: dict):
         self._config = device_config
         self._callbacks = {}
         self._ezsp_event = asyncio.Event()
-        self._ezsp_version = v4.EZSP_VERSION
+        self._ezsp_version = v4.EZSPv4.VERSION
         self._gw = None
         self._protocol = None
 
diff --git a/bellows/ezsp/config.py b/bellows/ezsp/config.py
index 19ba2f29..750b1ab2 100644
--- a/bellows/ezsp/config.py
+++ b/bellows/ezsp/config.py
@@ -116,4 +116,5 @@ class RuntimeConfig:
     8: DEFAULT_CONFIG_NEW,
     9: DEFAULT_CONFIG_NEW,
     10: DEFAULT_CONFIG_NEW,
+    11: DEFAULT_CONFIG_NEW,
 }
diff --git a/bellows/ezsp/protocol.py b/bellows/ezsp/protocol.py
index 20360731..87fcb3e7 100644
--- a/bellows/ezsp/protocol.py
+++ b/bellows/ezsp/protocol.py
@@ -24,7 +24,7 @@ class ProtocolHandler(abc.ABC):
     """EZSP protocol specific handler."""
 
     COMMANDS = {}
-    EZSP_VERSION = 4
+    VERSION = None
 
     def __init__(self, cb_handler: Callable, gateway: GatewayType) -> None:
         self._handle_callback = cb_handler
@@ -71,7 +71,7 @@ async def initialize(self, zigpy_config: Dict) -> None:
         # Not all config will be present in every EZSP version so only use valid keys
         ezsp_config = {}
 
-        for cfg in DEFAULT_CONFIG[self.EZSP_VERSION]:
+        for cfg in DEFAULT_CONFIG[self.VERSION]:
             config_id = self.types.EzspConfigId[cfg.config_id.name]
             ezsp_config[cfg.config_id.name] = dataclasses.replace(
                 cfg, config_id=config_id
diff --git a/bellows/ezsp/v10/__init__.py b/bellows/ezsp/v10/__init__.py
index 92918dec..09bdab3d 100644
--- a/bellows/ezsp/v10/__init__.py
+++ b/bellows/ezsp/v10/__init__.py
@@ -10,13 +10,13 @@
 from . import commands, config, types as v10_types
 from .. import protocol
 
-EZSP_VERSION = 10
 LOGGER = logging.getLogger(__name__)
 
 
 class EZSPv10(protocol.ProtocolHandler):
     """EZSP Version 10 Protocol version handler."""
 
+    VERSION = 10
     COMMANDS = commands.COMMANDS
     SCHEMAS = {
         bellows.config.CONF_EZSP_CONFIG: voluptuous.Schema(config.EZSP_SCHEMA),
diff --git a/bellows/ezsp/v11/__init__.py b/bellows/ezsp/v11/__init__.py
index 158f520e..bdbd7e2f 100644
--- a/bellows/ezsp/v11/__init__.py
+++ b/bellows/ezsp/v11/__init__.py
@@ -6,12 +6,11 @@
 from . import commands, config, types as v11_types
 from ..v10 import EZSPv10
 
-EZSP_VERSION = 11
-
 
 class EZSPv11(EZSPv10):
     """EZSP Version 11 Protocol version handler."""
 
+    VERSION = 11
     COMMANDS = commands.COMMANDS
     SCHEMAS = {
         bellows.config.CONF_EZSP_CONFIG: vol.Schema(config.EZSP_SCHEMA),
diff --git a/bellows/ezsp/v4/__init__.py b/bellows/ezsp/v4/__init__.py
index 38d76c10..f786b76f 100644
--- a/bellows/ezsp/v4/__init__.py
+++ b/bellows/ezsp/v4/__init__.py
@@ -9,13 +9,13 @@
 from . import commands, config, types as v4_types
 from .. import protocol
 
-EZSP_VERSION = 4
 LOGGER = logging.getLogger(__name__)
 
 
 class EZSPv4(protocol.ProtocolHandler):
     """EZSP Version 4 Protocol version handler."""
 
+    VERSION = 4
     COMMANDS = commands.COMMANDS
     SCHEMAS = {
         bellows.config.CONF_EZSP_CONFIG: voluptuous.Schema(config.EZSP_SCHEMA),
diff --git a/bellows/ezsp/v5/__init__.py b/bellows/ezsp/v5/__init__.py
index c4b7390b..e6856cd9 100644
--- a/bellows/ezsp/v5/__init__.py
+++ b/bellows/ezsp/v5/__init__.py
@@ -9,13 +9,13 @@
 from . import commands, config, types as v5_types
 from ..v4 import EZSPv4
 
-EZSP_VERSION = 5
 LOGGER = logging.getLogger(__name__)
 
 
 class EZSPv5(EZSPv4):
     """EZSP Version 5 Protocol version handler."""
 
+    VERSION = 5
     COMMANDS = commands.COMMANDS
     SCHEMAS = {
         bellows.config.CONF_EZSP_CONFIG: voluptuous.Schema(config.EZSP_SCHEMA),
diff --git a/bellows/ezsp/v6/__init__.py b/bellows/ezsp/v6/__init__.py
index bd9aea21..e15b4b0b 100644
--- a/bellows/ezsp/v6/__init__.py
+++ b/bellows/ezsp/v6/__init__.py
@@ -8,13 +8,13 @@
 from . import commands, config, types as v6_types
 from ..v5 import EZSPv5
 
-EZSP_VERSION = 6
 LOGGER = logging.getLogger(__name__)
 
 
 class EZSPv6(EZSPv5):
     """EZSP Version 6 Protocol version handler."""
 
+    VERSION = 6
     COMMANDS = commands.COMMANDS
     SCHEMAS = {
         bellows.config.CONF_EZSP_CONFIG: voluptuous.Schema(config.EZSP_SCHEMA),
diff --git a/bellows/ezsp/v7/__init__.py b/bellows/ezsp/v7/__init__.py
index e7f4f264..755711f8 100644
--- a/bellows/ezsp/v7/__init__.py
+++ b/bellows/ezsp/v7/__init__.py
@@ -8,13 +8,13 @@
 from . import commands, config, types as v7_types
 from ..v5 import EZSPv5
 
-EZSP_VERSION = 7
 LOGGER = logging.getLogger(__name__)
 
 
 class EZSPv7(EZSPv5):
     """EZSP Version 7 Protocol version handler."""
 
+    VERSION = 7
     COMMANDS = commands.COMMANDS
     SCHEMAS = {
         bellows.config.CONF_EZSP_CONFIG: voluptuous.Schema(config.EZSP_SCHEMA),
diff --git a/bellows/ezsp/v8/__init__.py b/bellows/ezsp/v8/__init__.py
index b645b73a..e731043e 100644
--- a/bellows/ezsp/v8/__init__.py
+++ b/bellows/ezsp/v8/__init__.py
@@ -10,13 +10,13 @@
 from . import commands, config, types as v8_types
 from .. import protocol
 
-EZSP_VERSION = 8
 LOGGER = logging.getLogger(__name__)
 
 
 class EZSPv8(protocol.ProtocolHandler):
     """EZSP Version 8 Protocol version handler."""
 
+    VERSION = 8
     COMMANDS = commands.COMMANDS
     SCHEMAS = {
         bellows.config.CONF_EZSP_CONFIG: voluptuous.Schema(config.EZSP_SCHEMA),
diff --git a/bellows/ezsp/v9/__init__.py b/bellows/ezsp/v9/__init__.py
index 0c767ca4..dba7b3a6 100644
--- a/bellows/ezsp/v9/__init__.py
+++ b/bellows/ezsp/v9/__init__.py
@@ -10,13 +10,13 @@
 from . import commands, config, types as v9_types
 from .. import protocol
 
-EZSP_VERSION = 9
 LOGGER = logging.getLogger(__name__)
 
 
 class EZSPv9(protocol.ProtocolHandler):
     """EZSP Version 9 Protocol version handler."""
 
+    VERSION = 9
     COMMANDS = commands.COMMANDS
     SCHEMAS = {
         bellows.config.CONF_EZSP_CONFIG: voluptuous.Schema(config.EZSP_SCHEMA),
diff --git a/tests/test_ezsp.py b/tests/test_ezsp.py
index b0700547..00784dee 100644
--- a/tests/test_ezsp.py
+++ b/tests/test_ezsp.py
@@ -599,3 +599,10 @@ async def test_wait_for_stack_status(ezsp_f):
         await stack_status
 
     assert not ezsp_f._stack_status_listeners[t.EmberStatus.NETWORK_DOWN]
+
+
+def test_ezsp_versions(ezsp_f):
+    for version in range(4, ezsp.EZSP_LATEST + 1):
+        assert version in ezsp_f._BY_VERSION
+        assert ezsp_f._BY_VERSION[version].__name__ == f"EZSPv{version}"
+        assert ezsp_f._BY_VERSION[version].VERSION == version
diff --git a/tests/test_ezsp_protocol.py b/tests/test_ezsp_protocol.py
index 2d353ac9..4f25e469 100644
--- a/tests/test_ezsp_protocol.py
+++ b/tests/test_ezsp_protocol.py
@@ -3,28 +3,17 @@
 
 import pytest
 
+from bellows.ezsp import EZSP
 import bellows.ezsp.v4
 import bellows.ezsp.v4.types as t
 
 from .async_mock import ANY, AsyncMock, MagicMock, call, patch
 
 
-class _DummyProtocolHandler(bellows.ezsp.v4.EZSPv4):
-    """Protocol handler mock."""
-
-    @property
-    def gw_mock(self):
-        return self._gw
-
-    @property
-    def cb_mock(self):
-        return self._handle_callback
-
-
 @pytest.fixture
 def prot_hndl():
     """Protocol handler mock."""
-    return _DummyProtocolHandler(MagicMock(), MagicMock())
+    return bellows.ezsp.v4.EZSPv4(MagicMock(), MagicMock())
 
 
 async def test_command(prot_hndl):
@@ -46,7 +35,7 @@ def test_receive_reply(prot_hndl):
     assert callback_mock.set_exception.call_count == 0
     assert callback_mock.set_result.call_count == 1
     callback_mock.set_result.assert_called_once_with([4, 5, 6])
-    assert prot_hndl.cb_mock.call_count == 0
+    assert prot_hndl._handle_callback.call_count == 0
 
 
 def test_receive_reply_after_timeout(prot_hndl):
@@ -59,7 +48,7 @@ def test_receive_reply_after_timeout(prot_hndl):
     assert callback_mock.set_exception.call_count == 0
     assert callback_mock.set_result.call_count == 1
     callback_mock.set_result.assert_called_once_with([4, 5, 6])
-    assert prot_hndl.cb_mock.call_count == 0
+    assert prot_hndl._handle_callback.call_count == 0
 
 
 def test_receive_reply_invalid_command(prot_hndl):
@@ -70,7 +59,7 @@ def test_receive_reply_invalid_command(prot_hndl):
     assert 0 not in prot_hndl._awaiting
     assert callback_mock.set_exception.call_count == 1
     assert callback_mock.set_result.call_count == 0
-    assert prot_hndl.cb_mock.call_count == 0
+    assert prot_hndl._handle_callback.call_count == 0
 
 
 async def test_cfg_initialize(prot_hndl, caplog):
@@ -127,6 +116,17 @@ async def test_config_initialize_husbzb1(prot_hndl):
     )
 
 
+@pytest.mark.parametrize("prot_hndl_cls", EZSP._BY_VERSION.values())
+async def test_config_initialize(prot_hndl_cls):
+    """Test config initialization for all protocol versions."""
+
+    prot_hndl = prot_hndl_cls(MagicMock(), MagicMock())
+    prot_hndl.getConfigurationValue = AsyncMock(return_value=(t.EzspStatus.SUCCESS, 0))
+    prot_hndl.setConfigurationValue = AsyncMock(return_value=(t.EzspStatus.SUCCESS,))
+
+    await prot_hndl.initialize({"ezsp_config": {}})
+
+
 async def test_cfg_initialize_skip(prot_hndl):
     """Test initialization."""