diff --git a/cmd/icingadb/main.go b/cmd/icingadb/main.go
index 1065989f..b23c952c 100644
--- a/cmd/icingadb/main.go
+++ b/cmd/icingadb/main.go
@@ -27,7 +27,7 @@ const (
 	ExitSuccess                = 0
 	ExitFailure                = 1
 	expectedRedisSchemaVersion = "4"
-	expectedDbSchemaVersion    = 2
+	expectedDbSchemaVersion    = 3
 )
 
 func main() {
diff --git a/schema/mysql/schema.sql b/schema/mysql/schema.sql
index fbf0e900..defcf616 100644
--- a/schema/mysql/schema.sql
+++ b/schema/mysql/schema.sql
@@ -945,7 +945,7 @@ CREATE TABLE notification_history (
   state tinyint unsigned NOT NULL,
   previous_hard_state tinyint unsigned NOT NULL,
   author text NOT NULL,
-  `text` text NOT NULL,
+  `text` longtext NOT NULL,
   users_notified smallint unsigned NOT NULL,
 
   PRIMARY KEY (id),
@@ -1121,4 +1121,4 @@ CREATE TABLE icingadb_schema (
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin ROW_FORMAT=DYNAMIC;
 
 INSERT INTO icingadb_schema (version, timestamp)
-  VALUES (2, CURRENT_TIMESTAMP() * 1000);
+  VALUES (3, CURRENT_TIMESTAMP() * 1000);
diff --git a/schema/mysql/upgrades/1.0.0.sql b/schema/mysql/upgrades/1.0.0.sql
new file mode 100644
index 00000000..ffd4404e
--- /dev/null
+++ b/schema/mysql/upgrades/1.0.0.sql
@@ -0,0 +1,5 @@
+ALTER TABLE notification_history
+    MODIFY `text` longtext NOT NULL;
+
+INSERT INTO icingadb_schema (version, timestamp)
+  VALUES (3, CURRENT_TIMESTAMP() * 1000);