diff --git a/CHANGELOG.md b/CHANGELOG.md
index dcdb8b59f..7f339014f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,16 @@ Changes
 
 .. towncrier release notes start
 
+21.03.5 (2021-05-17)
+--------------------
+
+### Features
+* Add `PRE_AUTH_MIDDLEWARE` hook for cookie-based SSO plugins ([#420](https://github.com/lablup/backend.ai-manager/issues/420))
+
+### Fixes
+* Optimize read-only GraphQL queries to use read-only transaction isolation level, which greatly reduces the database loads when using GUI ([#431](https://github.com/lablup/backend.ai-manager/issues/431))
+
+
 21.03.4 (2021-05-14)
 --------------------
 
diff --git a/changes/420.feature b/changes/420.feature
deleted file mode 100644
index 6c0f6c075..000000000
--- a/changes/420.feature
+++ /dev/null
@@ -1 +0,0 @@
-Add `PRE_AUTH_MIDDLEWARE` hook for cookie-based SSO plugins
diff --git a/changes/431.fix b/changes/431.fix
deleted file mode 100644
index 5cc8ee241..000000000
--- a/changes/431.fix
+++ /dev/null
@@ -1 +0,0 @@
-Optimize read-only GraphQL queries to use read-only transaction isolation level, which greatly reduces the database loads when using GUI
diff --git a/src/ai/backend/manager/__init__.py b/src/ai/backend/manager/__init__.py
index 84e65e7e9..ed2c0f124 100644
--- a/src/ai/backend/manager/__init__.py
+++ b/src/ai/backend/manager/__init__.py
@@ -1 +1 @@
-__version__ = '21.03.4'
+__version__ = '21.03.5'