diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7fe7abb0..c7e479c0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, "3.10"]
+        python-version: [3.8, 3.9, "3.10", "3.11"]
     steps:
       - name: Check out code from GitHub
         uses: actions/checkout@v2
@@ -224,7 +224,7 @@ jobs:
     needs: prepare-base
     strategy:
       matrix:
-        python-version: [3.8, 3.9, "3.10"]
+        python-version: [3.8, 3.9, "3.10", "3.11"]
     name: >-
       Run tests Python ${{ matrix.python-version }}
     steps:
diff --git a/setup.cfg b/setup.cfg
index 1a3ecd52..48ed1daf 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -11,9 +11,9 @@ license = GPL-3.0
 
 [options]
 packages = find:
-python_requires = >=3.7
+python_requires = >=3.8
 install_requires =
-    zigpy>=0.51.0
+    zigpy>=0.52.0
     async_timeout
     voluptuous
     coloredlogs
diff --git a/zigpy_znp/commands/util.py b/zigpy_znp/commands/util.py
index 6006ddb0..5d688e1a 100644
--- a/zigpy_znp/commands/util.py
+++ b/zigpy_znp/commands/util.py
@@ -12,6 +12,7 @@ class NodeRelation(t.enum_uint8):
     CHILD_FFD_RX_IDLE = 4
     NEIGHBOR = 5
     OTHER = 6
+    UNKNOWN_8 = 8
     NOTUSED = 0xFF
 
 
diff --git a/zigpy_znp/tools/common.py b/zigpy_znp/tools/common.py
index dd13d1be..33682548 100644
--- a/zigpy_znp/tools/common.py
+++ b/zigpy_znp/tools/common.py
@@ -177,7 +177,7 @@ class ClosableFileType(argparse.FileType):
     def __call__(self, string):
         f = super().__call__(string)
 
-        if f not in (sys.stdin, sys.stdout):
+        if f not in (sys.stdin, sys.stdout, sys.stdin.buffer, sys.stdout.buffer):
             return f
 
         return UnclosableFile(f)
diff --git a/zigpy_znp/types/basic.py b/zigpy_znp/types/basic.py
index 112469bf..7580a196 100644
--- a/zigpy_znp/types/basic.py
+++ b/zigpy_znp/types/basic.py
@@ -3,6 +3,8 @@
 import enum
 import typing
 
+import zigpy.types as zigpy_t
+
 from zigpy_znp.types.cstruct import CStruct
 
 
@@ -264,30 +266,6 @@ def deserialize(cls, data: bytes, *, align=False) -> tuple[CompleteList, bytes]:
         return r, data
 
 
-def enum_flag_factory(int_type: FixedIntType) -> enum.Flag:
-    """
-    Mixins are broken by Python 3.8.6 so we must dynamically create the enum with the
-    appropriate methods but with only one non-Enum parent class.
-    """
-
-    class _NewEnum(int_type, enum.Flag):  # type:ignore[misc,valid-type]
-        # Rebind classmethods to our own class
-        _missing_ = classmethod(enum.IntFlag._missing_.__func__)
-        _create_pseudo_member_ = classmethod(
-            enum.IntFlag._create_pseudo_member_.__func__
-        )
-
-        __or__ = enum.IntFlag.__or__
-        __and__ = enum.IntFlag.__and__
-        __xor__ = enum.IntFlag.__xor__
-        __ror__ = enum.IntFlag.__ror__
-        __rand__ = enum.IntFlag.__rand__
-        __rxor__ = enum.IntFlag.__rxor__
-        __invert__ = enum.IntFlag.__invert__
-
-    return _NewEnum  # type:ignore[return-value]
-
-
 class enum_uint8(uint8_t, enum.Enum):
     pass
 
@@ -320,33 +298,33 @@ class enum_uint64(uint64_t, enum.Enum):
     pass
 
 
-class enum_flag_uint8(enum_flag_factory(uint8_t)):  # type:ignore[misc]
+class enum_flag_uint8(zigpy_t.bitmap_factory(uint8_t)):  # type:ignore[misc]
     pass
 
 
-class enum_flag_uint16(enum_flag_factory(uint16_t)):  # type:ignore[misc]
+class enum_flag_uint16(zigpy_t.bitmap_factory(uint16_t)):  # type:ignore[misc]
     pass
 
 
-class enum_flag_uint24(enum_flag_factory(uint24_t)):  # type:ignore[misc]
+class enum_flag_uint24(zigpy_t.bitmap_factory(uint24_t)):  # type:ignore[misc]
     pass
 
 
-class enum_flag_uint32(enum_flag_factory(uint32_t)):  # type:ignore[misc]
+class enum_flag_uint32(zigpy_t.bitmap_factory(uint32_t)):  # type:ignore[misc]
     pass
 
 
-class enum_flag_uint40(enum_flag_factory(uint40_t)):  # type:ignore[misc]
+class enum_flag_uint40(zigpy_t.bitmap_factory(uint40_t)):  # type:ignore[misc]
     pass
 
 
-class enum_flag_uint48(enum_flag_factory(uint48_t)):  # type:ignore[misc]
+class enum_flag_uint48(zigpy_t.bitmap_factory(uint48_t)):  # type:ignore[misc]
     pass
 
 
-class enum_flag_uint56(enum_flag_factory(uint56_t)):  # type:ignore[misc]
+class enum_flag_uint56(zigpy_t.bitmap_factory(uint56_t)):  # type:ignore[misc]
     pass
 
 
-class enum_flag_uint64(enum_flag_factory(uint64_t)):  # type:ignore[misc]
+class enum_flag_uint64(zigpy_t.bitmap_factory(uint64_t)):  # type:ignore[misc]
     pass