diff --git a/CHANGELOG.md b/CHANGELOG.md
index b34622a..b27a21a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,10 +3,27 @@
 All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this
-project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+project adheres to clauses 1–8 of [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+## [0.13.0b1] (Jun 13 2024)
+
+### Added
+
+- The timestamps of non-`ParamData` children are now tracked internally and can be
+  accessed via the new method `ParamData.child_last_updated()`.
+
+### Changed
+
+- `ParamDict` dot notation now treates names of existing attributes and names of class
+  type annotations as attributes (rather than treating all names beginning with
+  underscores as attributes).
+
+### Removed
+
+- Parameter primitive classes have been replaced by the new timestamp tracking.
+
 ## [0.12.0] (May 8 2024)
 
 ### Added
@@ -169,7 +186,8 @@ project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 - Database class `ParamDB` to store parameters in a SQLite file
 - Ability to retrieve the commit history as `CommitEntry` objects
 
-[unreleased]: https://github.com/PainterQubits/paramdb/compare/v0.12.0...develop
+[unreleased]: https://github.com/PainterQubits/paramdb/compare/v0.13.0b1...develop
+[0.13.0b1]: https://github.com/PainterQubits/paramdb/releases/tag/v0.13.0b1
 [0.12.0]: https://github.com/PainterQubits/paramdb/releases/tag/v0.12.0
 [0.11.0]: https://github.com/PainterQubits/paramdb/releases/tag/v0.11.0
 [0.10.2]: https://github.com/PainterQubits/paramdb/releases/tag/v0.10.2
diff --git a/CITATION.cff b/CITATION.cff
index 20932af..d8202dd 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -4,6 +4,6 @@ authors:
   - family-names: "Hadley"
     given-names: "Alex"
 title: "ParamDB"
-version: 0.12.0
-date-released: 2024-05-08
+version: 0.13.0b1
+date-released: 2024-06-13
 url: "https://github.com/PainterQubits/paramdb"
diff --git a/docs/conf.py b/docs/conf.py
index 7775dff..9d0be58 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -4,7 +4,7 @@
 project = "ParamDB"
 copyright = "2023–2024, California Institute of Technology"
 author = "Alex Hadley"
-release = "0.12.0"
+release = "0.13.0b1"
 
 # General configuration
 extensions = [
diff --git a/pyproject.toml b/pyproject.toml
index d99556a..0b09ddb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.poetry]
 name = "paramdb"
-version = "0.12.0"
+version = "0.13.0b1"
 description = "Python package for storing and retrieving experiment parameters."
 authors = ["Alex Hadley <contact@alexhadley.net>"]
 license = "BSD-3-Clause"