diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6f1ef4..0f1e6a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,8 @@
 # Changelog
 
-## [«unknown»](https://github.com/NASA-PDS/doi-service/tree/«unknown») (2023-07-12)
+## [release/2.4.0](https://github.com/NASA-PDS/doi-service/tree/release/2.4.0) (2023-09-20)
 
-[Full Changelog](https://github.com/NASA-PDS/doi-service/compare/v2.3.6...«unknown»)
+[Full Changelog](https://github.com/NASA-PDS/doi-service/compare/v2.3.6...release/2.4.0)
 
 **Defects:**
 
@@ -11,6 +11,7 @@
 
 **Other closed issues:**
 
+- Purge doi.db from test dois [\#411](https://github.com/NASA-PDS/doi-service/issues/411)
 - Deploy ADS delivery script to operations [\#399](https://github.com/NASA-PDS/doi-service/issues/399)
 
 ## [v2.3.6](https://github.com/NASA-PDS/doi-service/tree/v2.3.6) (2023-04-27)
@@ -258,17 +259,12 @@
 
 ## [v0.3.1](https://github.com/NASA-PDS/doi-service/tree/v0.3.1) (2021-08-04)
 
-[Full Changelog](https://github.com/NASA-PDS/doi-service/compare/v1.1.1...v0.3.1)
+[Full Changelog](https://github.com/NASA-PDS/doi-service/compare/v21.2.0...v0.3.1)
 
 **Requirements:**
 
 - As an admistrator of the application,  I want to restrict access to API by specific referrer [\#228](https://github.com/NASA-PDS/doi-service/issues/228)
-- As a user, I want to use the API with ids containing a slash \(/\) [\#198](https://github.com/NASA-PDS/doi-service/issues/198)
 - As a SA, I want the operational deployment of the service to be secure [\#187](https://github.com/NASA-PDS/doi-service/issues/187)
-- As an operator, I want to update DOI metadata through DataCite [\#175](https://github.com/NASA-PDS/doi-service/issues/175)
-- As an operator, I want to release a DOI through DataCite [\#174](https://github.com/NASA-PDS/doi-service/issues/174)
-- As an operator, I want query for one or more minted DOIs from DataCite [\#172](https://github.com/NASA-PDS/doi-service/issues/172)
-- As an operator, I want to reserve a DOI through DataCite [\#171](https://github.com/NASA-PDS/doi-service/issues/171)
 
 **Improvements:**
 
@@ -277,6 +273,21 @@
 **Defects:**
 
 - CI does not work on main branch for dev release [\#220](https://github.com/NASA-PDS/doi-service/issues/220)
+
+## [v21.2.0](https://github.com/NASA-PDS/doi-service/tree/v21.2.0) (2021-07-21)
+
+[Full Changelog](https://github.com/NASA-PDS/doi-service/compare/v1.1.1...v21.2.0)
+
+**Requirements:**
+
+- As a user, I want to use the API with ids containing a slash \(/\) [\#198](https://github.com/NASA-PDS/doi-service/issues/198)
+- As an operator, I want to update DOI metadata through DataCite [\#175](https://github.com/NASA-PDS/doi-service/issues/175)
+- As an operator, I want to release a DOI through DataCite [\#174](https://github.com/NASA-PDS/doi-service/issues/174)
+- As an operator, I want query for one or more minted DOIs from DataCite [\#172](https://github.com/NASA-PDS/doi-service/issues/172)
+- As an operator, I want to reserve a DOI through DataCite [\#171](https://github.com/NASA-PDS/doi-service/issues/171)
+
+**Defects:**
+
 - pytest does not work [\#219](https://github.com/NASA-PDS/doi-service/issues/219) [[s.high](https://github.com/NASA-PDS/doi-service/labels/s.high)]
 - Release OSTI command line does not work in one case [\#218](https://github.com/NASA-PDS/doi-service/issues/218) [[s.high](https://github.com/NASA-PDS/doi-service/labels/s.high)]
 - The issue \#140 does not work as expected [\#208](https://github.com/NASA-PDS/doi-service/issues/208) [[s.low](https://github.com/NASA-PDS/doi-service/labels/s.low)]