diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18ad77b..d54d500 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## Version 1.8.1 (2023-05-07)
+
+- Fixed bad deprecation warning with `highlighter`
+- Fixed incompatibility with Click 9.
+
 ## Version 1.8.0 (2023-04-30)
 
 - Add `--rich-config` and `--output` options to the `rich-click` CLI.
diff --git a/src/rich_click/__init__.py b/src/rich_click/__init__.py
index 56d2109..8e0d246 100644
--- a/src/rich_click/__init__.py
+++ b/src/rich_click/__init__.py
@@ -6,7 +6,7 @@
 customisation required.
 """
 
-__version__ = "1.8.0"
+__version__ = "1.8.1"
 
 # Import the entire click API here.
 # We need to manually import these instead of `from click import *` to force
diff --git a/src/rich_click/rich_click.py b/src/rich_click/rich_click.py
index f9fe147..cba1c39 100644
--- a/src/rich_click/rich_click.py
+++ b/src/rich_click/rich_click.py
@@ -116,18 +116,20 @@ def __getattr__(name: str) -> Any:
 
         return RichHelpConfiguration.load_from_globals
     if name == "highlighter":
-        import warnings
+        # TODO: Fix deprecation warning. For now, exclude.
 
-        from rich_click.rich_help_configuration import OptionHighlighter
+        # import warnings
 
-        warnings.warn(
-            "`highlighter` config option is deprecated."
-            " Please do one of the following instead: either set HIGHLIGHTER_PATTERNS = [...] if you want"
-            " to use regex; or for more advanced use cases where you'd like to use a different type"
-            " of rich.highlighter.Highlighter, subclass the `RichHelpFormatter` and update its `highlighter`.",
-            DeprecationWarning,
-            stacklevel=2,
-        )
+        # warnings.warn(
+        #     "`highlighter` config option is deprecated."
+        #     " Please do one of the following instead: either set HIGHLIGHTER_PATTERNS = [...] if you want"
+        #     " to use regex; or for more advanced use cases where you'd like to use a different type"
+        #     " of rich.highlighter.Highlighter, subclass the `RichHelpFormatter` and update its `highlighter`.",
+        #     DeprecationWarning,
+        #     stacklevel=2,
+        # )
+
+        from rich_click.rich_help_configuration import OptionHighlighter
 
         globals()["highlighter"] = highlighter = OptionHighlighter()
         return highlighter
diff --git a/src/rich_click/rich_command.py b/src/rich_click/rich_command.py
index 3129cc7..a3f9d3e 100644
--- a/src/rich_click/rich_command.py
+++ b/src/rich_click/rich_command.py
@@ -220,10 +220,16 @@ def format_help_text(self, ctx: RichContext, formatter: RichHelpFormatter) -> No
 
         get_rich_help_text(self, ctx, formatter)
 
-    def format_options(self, ctx: RichContext, formatter: RichHelpFormatter) -> None:  # type: ignore[override]
+    # TODO:
+    #  Switching from base click to rich click causes mypy problems.
+    #  Either we: (a) swap MRO (incompatible with click 9, without handling 8 and 9 differently)
+    #  or (b) we allow issues when users attempt multiple inheritance with a RichCommand
+    #  or (c) we use incorrect types here.
+    #  We are looking for a solution that fixes all 3. For now, we opt for (c).
+    def format_options(self, ctx: click.Context, formatter: click.HelpFormatter) -> None:
         from rich_click.rich_help_rendering import get_rich_options
 
-        get_rich_options(self, ctx, formatter)
+        get_rich_options(self, ctx, formatter)  # type: ignore[arg-type]
 
     def format_epilog(self, ctx: RichContext, formatter: RichHelpFormatter) -> None:  # type: ignore[override]
         from rich_click.rich_help_rendering import get_rich_epilog
@@ -264,7 +270,7 @@ def make_context(
     MultiCommand = Group  # type: ignore[misc,assignment]
 
 
-class RichMultiCommand(MultiCommand, RichCommand):
+class RichMultiCommand(RichCommand, MultiCommand):
     """
     Richly formatted click MultiCommand.
 
@@ -282,11 +288,12 @@ def format_commands(self, ctx: RichContext, formatter: RichHelpFormatter) -> Non
 
         get_rich_commands(self, ctx, formatter)
 
-    def format_options(self, ctx: RichContext, formatter: RichHelpFormatter) -> None:  # type: ignore[override]
+    def format_options(self, ctx: click.Context, formatter: click.HelpFormatter) -> None:
         from rich_click.rich_help_rendering import get_rich_options
 
-        get_rich_options(self, ctx, formatter)
-        self.format_commands(ctx, formatter)
+        get_rich_options(self, ctx, formatter)  # type: ignore[arg-type]
+
+        self.format_commands(ctx, formatter)  # type: ignore[arg-type]
 
     def format_help(self, ctx: RichContext, formatter: RichHelpFormatter) -> None:  # type: ignore[override]
         if OVERRIDES_GUARD:
@@ -298,7 +305,7 @@ def format_help(self, ctx: RichContext, formatter: RichHelpFormatter) -> None:
             self.format_epilog(ctx, formatter)
 
 
-class RichGroup(Group, RichMultiCommand):
+class RichGroup(RichMultiCommand, Group):
     """
     Richly formatted click Group.
 
@@ -360,7 +367,7 @@ def __call__(self, *args: Any, **kwargs: Any) -> Any:
         return super().__call__(*args, **kwargs)
 
 
-class RichCommandCollection(RichGroup, CommandCollection):
+class RichCommandCollection(CommandCollection, RichGroup):
     """
     Richly formatted click CommandCollection.