diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0a2b155c7..8a144a07d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,18 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.0.0] - Unreleased
+
+### Changed
+
+- Enabled supported box chars for legacy Windows, and introduce `safe_box` flag
+- Disable hyperlinks on legacy Windows
+- Constructors for Rule and Panel now have keyword only arguments (reson for major version bump)
+
+### Fixed
+
+- Fixed Table measure
+
 ## [2.3.1] - 2020-06-26
 
 ### Fixed
diff --git a/pyproject.toml b/pyproject.toml
index 08ff10003..d92684ac5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 name = "rich"
 homepage = "https://github.com/willmcgugan/rich"
 documentation = "https://rich.readthedocs.io/en/latest/"
-version = "2.3.1"
+version = "3.0.0"
 description = "Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal"
 authors = ["Will McGugan <willmcgugan@gmail.com>"]
 license = "MIT"
diff --git a/rich/columns.py b/rich/columns.py
index be05c090b..7d46bab36 100644
--- a/rich/columns.py
+++ b/rich/columns.py
@@ -28,6 +28,7 @@ def __init__(
         self,
         renderables: Iterable[RenderableType] = None,
         padding: PaddingDimensions = (0, 1),
+        *,
         width: int = None,
         expand: bool = False,
         equal: bool = False,
diff --git a/rich/panel.py b/rich/panel.py
index 5a8753cc7..32327f03d 100644
--- a/rich/panel.py
+++ b/rich/panel.py
@@ -38,6 +38,7 @@ def __init__(
         self,
         renderable: RenderableType,
         box: Box = ROUNDED,
+        *,
         safe_box: bool = True,
         expand: bool = True,
         style: Union[str, Style] = "none",
diff --git a/rich/rule.py b/rich/rule.py
index e5bfd4232..0e0851164 100644
--- a/rich/rule.py
+++ b/rich/rule.py
@@ -18,6 +18,7 @@ class Rule(JupyterMixin):
     def __init__(
         self,
         title: Union[str, Text] = "",
+        *,
         character: str = None,
         style: Union[str, Style] = "rule.line",
     ) -> None: