diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index c0716f2..90e5834 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 1.2.0
+current_version = 1.2.1
 
 [bumpversion:file:.bumpversion.cfg]
 
diff --git a/HISTORY.rst b/HISTORY.rst
index 1fe5b6c..54867e6 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -1,3 +1,12 @@
+1.2.1 (2023-09-19)
+==================
+
+Bugfixes
+--------
+
+- Fix isinstance and issublcass method on multi levels inheritance hierarchy. (`#14 <https://github.com/lmignon/extendable/pull/14>`_)
+
+
 1.2.0 (2023-07-28)
 ==================
 
diff --git a/news/isinstance.bugfix b/news/isinstance.bugfix
deleted file mode 100644
index 74ef1ff..0000000
--- a/news/isinstance.bugfix
+++ /dev/null
@@ -1 +0,0 @@
-Fix isinstance and issublcass method on multi levels inheritance hierarchy.
diff --git a/src/extendable/version.py b/src/extendable/version.py
index c68196d..a955fda 100644
--- a/src/extendable/version.py
+++ b/src/extendable/version.py
@@ -1 +1 @@
-__version__ = "1.2.0"
+__version__ = "1.2.1"