diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 12cf0dd..ebf9241 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,3 +1,23 @@
+4.3.0 (2025-07-22)
+------------------
+
+* Added support for Python 3.13.
+
+* Dropped support for EOL Python 3.8.
+
+* Updated Channels dependency to at least v4.2.2.
+
+* Updated asgiref dependency to at least v3.9.1.
+
+* Fixed compatibility with latest versions of pytest-asyncio.
+
+* Renamed internal methods in core channel layer for compatibility with
+  Channels v4.2.1+
+
+* Dropped testing against legacy Channels v3 branch.
+
+* Updated testing against latest redis-py versions.
+
 4.2.1 (2024-11-15)
 ------------------
 
diff --git a/README.rst b/README.rst
index 1673349..6ff225c 100644
--- a/README.rst
+++ b/README.rst
@@ -19,9 +19,11 @@ There are two available implementations:
 
 Both layers support a single-server and sharded configurations.
 
-`channels_redis` is tested against Python 3.9 to 3.13, `redis-py` versions 4.6,
-5.0, and the development branch, and Channels versions 3, 4 and the development
-branch there.
+`channels_redis` is tested against Python 3.9 to 3.13. We test with the latest
+`redis-py` version, as well as the older 5.x branch and main development branch,
+using the latest stable Python and Channels versions. We test the Channels
+development branch, using the latest stable Python and the latest `redis-py`
+release.
 
 Installation
 ------------
diff --git a/channels_redis/__init__.py b/channels_redis/__init__.py
index aef46ac..111dc91 100644
--- a/channels_redis/__init__.py
+++ b/channels_redis/__init__.py
@@ -1 +1 @@
-__version__ = "4.2.1"
+__version__ = "4.3.0"
diff --git a/channels_redis/core.py b/channels_redis/core.py
index a230081..9721d7b 100644
--- a/channels_redis/core.py
+++ b/channels_redis/core.py
@@ -169,7 +169,7 @@ async def send(self, channel, message):
         """
         # Typecheck
         assert isinstance(message, dict), "message is not a dict"
-        assert self.valid_channel_name(channel), "Channel name not valid"
+        assert self.require_valid_channel_name(channel), "Channel name not valid"
         # Make sure the message does not contain reserved keys
         assert "__asgi_channel__" not in message
         # If it's a process-local channel, strip off local part and stick full name in message
@@ -256,7 +256,7 @@ async def receive(self, channel):
         """
         # Make sure the channel name is valid then get the non-local part
         # and thus its index
-        assert self.valid_channel_name(channel)
+        assert self.require_valid_channel_name(channel)
         if "!" in channel:
             real_channel = self.non_local_name(channel)
             assert real_channel.endswith(
@@ -377,7 +377,9 @@ async def receive_single(self, channel):
         Receives a single message off of the channel and returns it.
         """
         # Check channel name
-        assert self.valid_channel_name(channel, receive=True), "Channel name invalid"
+        assert self.require_valid_channel_name(
+            channel, receive=True
+        ), "Channel name invalid"
         # Work out the connection to use
         if "!" in channel:
             assert channel.endswith("!")
@@ -482,8 +484,8 @@ async def group_add(self, group, channel):
         Adds the channel name to a group.
         """
         # Check the inputs
-        assert self.valid_group_name(group), "Group name not valid"
-        assert self.valid_channel_name(channel), "Channel name not valid"
+        assert self.require_valid_group_name(group), "Group name not valid"
+        assert self.require_valid_channel_name(channel), "Channel name not valid"
         # Get a connection to the right shard
         group_key = self._group_key(group)
         connection = self.connection(self.consistent_hash(group))
@@ -498,8 +500,8 @@ async def group_discard(self, group, channel):
         Removes the channel from the named group if it is in the group;
         does nothing otherwise (does not error)
         """
-        assert self.valid_group_name(group), "Group name not valid"
-        assert self.valid_channel_name(channel), "Channel name not valid"
+        assert self.require_valid_group_name(group), "Group name not valid"
+        assert self.require_valid_channel_name(channel), "Channel name not valid"
         key = self._group_key(group)
         connection = self.connection(self.consistent_hash(group))
         await connection.zrem(key, channel)
@@ -508,7 +510,7 @@ async def group_send(self, group, message):
         """
         Sends a message to the entire group.
         """
-        assert self.valid_group_name(group), "Group name not valid"
+        assert self.require_valid_group_name(group), "Group name not valid"
         # Retrieve list of all channel names
         key = self._group_key(group)
         connection = self.connection(self.consistent_hash(group))
diff --git a/setup.py b/setup.py
index bf272f7..56eee12 100644
--- a/setup.py
+++ b/setup.py
@@ -33,8 +33,8 @@
     install_requires=[
         "redis>=4.6",
         "msgpack~=1.0",
-        "asgiref>=3.2.10,<4",
-        "channels",
+        "asgiref>=3.9.1,<4",
+        "channels>=4.2.2",
     ],
     extras_require={"cryptography": crypto_requires, "tests": test_requires},
 )
diff --git a/tox.ini b/tox.ini
index af89536..ffdfc99 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,8 @@
 [tox]
 envlist =
-    py{39,310,311,312,313}-ch{30,40,main}-redis50
-    py311-chmain-redis{45,46,50,main}
+    py{39,310,311,312,313}-ch4-redis6
+    py313-chmain-redis6
+    py313-ch4-redis{5,main}
     qa
 
 [testenv]
@@ -10,11 +11,10 @@ extras = tests
 commands =
     pytest -v {posargs}
 deps =
-    ch30: channels>=3.0,<3.1
-    ch40: channels>=4.0,<4.1
+    ch4: channels>=4.0,<5
     chmain: https://github.com/django/channels/archive/main.tar.gz
-    redis46: redis>=4.6,<4.7
-    redis50: redis>=5.0,<5.1
+    redis5: redis>=5.0,<6
+    redis6: redis>=6.0,<7
     redismain: https://github.com/redis/redis-py/archive/master.tar.gz
 
 [testenv:qa]