diff --git a/CHANGELOG.md b/CHANGELOG.md
index 316d45df..24c18f94 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+Release 0.4.0 October 27, 2023
+- Refactored the model classes to be based on DataFrame.
+- Added additional command line options for remodeling tools.
+- Restructured summaries for better reporting.
+- Minor refactoring to reduce code complexity.
+- Finalized and automated SPEC tests.
+- Improvements to GitHub automation -- including adding CodeSpell.
+- Improvements to API-Docs.
+
 Release 0.3.1 July 3, 2023
 - Pinned the version of the pydantic and inflect libraries due to inflict.
 - Reorganized JSON output of remodeling summaries so that all of consistent form.
@@ -5,7 +14,6 @@ Release 0.3.1 July 3, 2023
 - Minor refactoring to reduce code complexity.
 - BaseInput and Sidecar now raise HedFileError if input could not be read.
 
-
 Release 0.3.0 June 20, 2023
 - Introduction of partnered schema.
 - Improved error handling for schema validation.
diff --git a/docs/source/conf.py b/docs/source/conf.py
index 4bc9f309..5887981e 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -24,8 +24,8 @@
 author = 'HED Working Group'
 
 # The full version, including alpha/beta/rc tags
-version = '0.3.1'
-release = '0.3.1'
+version = '0.4.0'
+release = '0.4.0'
 
 currentdir = os.path.realpath(os.path.dirname(__file__))