diff --git a/plugins/calendar/UPGRADING b/plugins/calendar/UPGRADING
index 524c2ac0..0e36e856 100644
--- a/plugins/calendar/UPGRADING
+++ b/plugins/calendar/UPGRADING
@@ -8,10 +8,10 @@ updatedb.sh --package=calendar-<driver> --version=<version> \
   --dir=../plugins/calendar/drivers/<driver>/SQL
 
 [*] Replace <driver> with "database" or "kolab" (without quotes)
-[*] Replace <version> with Roundcube version e.g. 0.7.3
+[*] Replace <version> with Roundcube version e.g. 0.9.0
 [*] Roundcube should be upgraded before plugin upgrades
 
 Example:
 
-updatedb.sh --package=calendar-kolab --version=0.8.0 \
+updatedb.sh --package=calendar-kolab --version=0.9.0 \
   --dir=../plugins/calendar/drivers/kolab/SQL
diff --git a/plugins/calendar/drivers/database/SQL/mysql.initial.sql b/plugins/calendar/drivers/database/SQL/mysql.initial.sql
index 57a7cfaf..392b32f8 100644
--- a/plugins/calendar/drivers/database/SQL/mysql.initial.sql
+++ b/plugins/calendar/drivers/database/SQL/mysql.initial.sql
@@ -82,4 +82,4 @@ 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', '2014040900');
+REPLACE INTO system (name, value) VALUES ('calendar-database-version', '2015022700');
diff --git a/plugins/calendar/drivers/database/SQL/postgres.initial.sql b/plugins/calendar/drivers/database/SQL/postgres.initial.sql
index a0b61729..b170086c 100644
--- a/plugins/calendar/drivers/database/SQL/postgres.initial.sql
+++ b/plugins/calendar/drivers/database/SQL/postgres.initial.sql
@@ -106,4 +106,4 @@ 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', '2014040900');
+INSERT INTO system (name, value) VALUES ('calendar-database-version', '2015022700');
diff --git a/plugins/calendar/drivers/database/SQL/sqlite.initial.sql b/plugins/calendar/drivers/database/SQL/sqlite.initial.sql
index a94c9b02..c8aa9718 100644
--- a/plugins/calendar/drivers/database/SQL/sqlite.initial.sql
+++ b/plugins/calendar/drivers/database/SQL/sqlite.initial.sql
@@ -76,4 +76,4 @@ CREATE TABLE itipinvitations (
 
 CREATE INDEX ix_itipinvitations_uid ON itipinvitations(user_id, event_uid);
 
-INSERT INTO system (name, value) VALUES ('calendar-database-version', '2014040900');
+INSERT INTO system (name, value) VALUES ('calendar-database-version', '2015022700');