diff --git a/plugins/calendar/drivers/database/SQL/mysql.initial.sql b/plugins/calendar/drivers/database/SQL/mysql.initial.sql
index ed989be7..8d4eeb0d 100644
--- a/plugins/calendar/drivers/database/SQL/mysql.initial.sql
+++ b/plugins/calendar/drivers/database/SQL/mysql.initial.sql
@@ -80,4 +80,4 @@ CREATE TABLE IF NOT EXISTS `itipinvitations` (
     REFERENCES `users`(`user_id`) ON DELETE CASCADE ON UPDATE CASCADE
 ) /*!40000 ENGINE=INNODB */ /*!40101 CHARACTER SET utf8 COLLATE utf8_general_ci */;
 
-REPLACE INTO system (name, value) VALUES ('calendar-database-version', '2013051600');
+REPLACE INTO system (name, value) VALUES ('calendar-database-version', '2014040900');
diff --git a/plugins/calendar/drivers/database/SQL/postgres.initial.sql b/plugins/calendar/drivers/database/SQL/postgres.initial.sql
index 21239c62..27223cbb 100644
--- a/plugins/calendar/drivers/database/SQL/postgres.initial.sql
+++ b/plugins/calendar/drivers/database/SQL/postgres.initial.sql
@@ -104,4 +104,4 @@ CREATE TABLE itipinvitations (
 
 CREATE INDEX itipinvitations_user_id_event_uid_idx ON itipinvitations (user_id, event_uid);
 
-INSERT INTO system (name, value) VALUES ('calendar-database-version', '2013051600');
+INSERT INTO system (name, value) VALUES ('calendar-database-version', '2014040900');
diff --git a/plugins/calendar/drivers/database/SQL/sqlite.initial.sql b/plugins/calendar/drivers/database/SQL/sqlite.initial.sql
index 078007de..ad02f90d 100644
--- a/plugins/calendar/drivers/database/SQL/sqlite.initial.sql
+++ b/plugins/calendar/drivers/database/SQL/sqlite.initial.sql
@@ -74,4 +74,4 @@ CREATE TABLE itipinvitations (
 
 CREATE INDEX ix_itipinvitations_uid ON itipinvitations(user_id, event_uid);
 
-INSERT INTO system (name, value) VALUES ('calendar-database-version', '2013051600');
+INSERT INTO system (name, value) VALUES ('calendar-database-version', '2014040900');