diff --git a/CHANGELOG.md b/CHANGELOG.md
index a9c36830..2fe70f83 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,7 +10,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
-## [1.2.1] - 2023-08-03
+## [1.2.1] - 2023-10-05
 
 ### Add
 
diff --git a/moPepGen/__init__.py b/moPepGen/__init__.py
index fe28eba1..1faba5a4 100644
--- a/moPepGen/__init__.py
+++ b/moPepGen/__init__.py
@@ -5,7 +5,7 @@
 from typing import Iterable, IO
 
 
-__version__ = '1.2.0'
+__version__ = '1.2.1'
 
 ## Error messages
 ERROR_INDEX_IN_INTRON = 'The genomic index seems to be in an intron'