diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7d3bb6221..718d9ee5a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,13 @@ Changes
 
 .. towncrier release notes start
 
+20.09.15 (2021-04-02)
+---------------------
+
+### Fixes
+* Fix a regression of spawning multi-node cluster sessions due to DB API changes related to setting transaction isolation levels ([#416](https://github.com/lablup/backend.ai-manager/issues/416))
+
+
 20.09.14 (2021-03-31)
 ---------------------
 
diff --git a/changes/416.fix b/changes/416.fix
deleted file mode 100644
index 20af1d086..000000000
--- a/changes/416.fix
+++ /dev/null
@@ -1 +0,0 @@
-Fix a regression of spawning multi-node cluster sessions due to DB API changes related to setting transaction isolation levels
diff --git a/src/ai/backend/manager/__init__.py b/src/ai/backend/manager/__init__.py
index fc3cd7469..58063c887 100644
--- a/src/ai/backend/manager/__init__.py
+++ b/src/ai/backend/manager/__init__.py
@@ -1 +1 @@
-__version__ = '20.09.14'
+__version__ = '20.09.15'