diff --git a/common/version.go b/common/version.go
index b0f7daa3..009b13c0 100644
--- a/common/version.go
+++ b/common/version.go
@@ -10,7 +10,7 @@ import (
 var Version = "0.2.2"
 
 // DevVersion is the service current development version.
-var DevVersion = "0.2.2"
+var DevVersion = "0.3.0"
 
 func GetCurrentVersion(mode string) string {
 	if mode == "dev" {
diff --git a/store/db/migration/0.2/00__user_role.sql b/store/db/migration/0.2/00__user_role.sql
index 942dc6c0..8620cde7 100644
--- a/store/db/migration/0.2/00__user_role.sql
+++ b/store/db/migration/0.2/00__user_role.sql
@@ -4,8 +4,7 @@ PRAGMA foreign_keys = off;
 
 DROP TABLE IF EXISTS _user_old;
 
-ALTER TABLE 
-  user RENAME TO _user_old;
+ALTER TABLE user RENAME TO _user_old;
 
 CREATE TABLE user (
   id INTEGER PRIMARY KEY AUTOINCREMENT, 
diff --git a/store/db/migration/0.3/00__memo_visibility_protected.sql b/store/db/migration/0.3/00__memo_visibility_protected.sql
new file mode 100644
index 00000000..24c62e3a
--- /dev/null
+++ b/store/db/migration/0.3/00__memo_visibility_protected.sql
@@ -0,0 +1,37 @@
+-- change memo visibility field from "PRIVATE"/"PUBLIC" to "PRIVATE"/"PROTECTED"/"PUBLIC".
+
+PRAGMA foreign_keys = off;
+
+DROP TABLE IF EXISTS _memo_old;
+
+ALTER TABLE memo RENAME TO _memo_old;
+
+CREATE TABLE memo (
+  id INTEGER PRIMARY KEY AUTOINCREMENT, 
+  creator_id INTEGER NOT NULL, 
+  created_ts BIGINT NOT NULL DEFAULT (strftime('%s', 'now')), 
+  updated_ts BIGINT NOT NULL DEFAULT (strftime('%s', 'now')), 
+  row_status TEXT NOT NULL CHECK (row_status IN ('NORMAL', 'ARCHIVED')) DEFAULT 'NORMAL', 
+  content TEXT NOT NULL DEFAULT '', 
+  visibility TEXT NOT NULL CHECK (visibility IN ('PUBLIC', 'PROTECTED', 'PRIVATE')) DEFAULT 'PRIVATE', 
+  FOREIGN KEY(creator_id) REFERENCES user(id) ON DELETE CASCADE
+);
+
+INSERT INTO memo (
+  id, creator_id, created_ts, updated_ts, 
+  row_status, content, visibility
+) 
+SELECT 
+  id, 
+  creator_id, 
+  created_ts, 
+  updated_ts, 
+  row_status, 
+  content, 
+  visibility
+FROM 
+  _memo_old;
+
+DROP TABLE IF EXISTS _memo_old;
+
+PRAGMA foreign_keys = on;
diff --git a/store/db/migration/LATEST__SCHEMA.sql b/store/db/migration/LATEST__SCHEMA.sql
index 6591bdec..ca0bb148 100644
--- a/store/db/migration/LATEST__SCHEMA.sql
+++ b/store/db/migration/LATEST__SCHEMA.sql
@@ -44,7 +44,7 @@ CREATE TABLE memo (
   updated_ts BIGINT NOT NULL DEFAULT (strftime('%s', 'now')),
   row_status TEXT NOT NULL CHECK (row_status IN ('NORMAL', 'ARCHIVED')) DEFAULT 'NORMAL',
   content TEXT NOT NULL DEFAULT '',
-  visibility TEXT NOT NULL CHECK (visibility IN ('PUBLIC', 'PRIVATE')) DEFAULT 'PRIVATE',
+  visibility TEXT NOT NULL CHECK (visibility IN ('PUBLIC', 'PROTECTED', 'PRIVATE')) DEFAULT 'PRIVATE',
   FOREIGN KEY(creator_id) REFERENCES user(id) ON DELETE CASCADE
 );