diff --git a/server/model/log.go b/server/model/log.go
index 8bf7f683a..b56dda3b6 100644
--- a/server/model/log.go
+++ b/server/model/log.go
@@ -17,6 +17,6 @@ package model
 type Logs struct {
 	ID     int64  `xorm:"pk autoincr 'log_id'"`
 	ProcID int64  `xorm:"UNIQUE 'log_job_id'"`
-	Data   []byte `xorm:"log_data"`
+	Data   []byte `xorm:"LONGBLOB 'log_data'"`
 	// TODO: add create timestamp
 }
diff --git a/server/store/datastore/migration/006_log_data_type.go b/server/store/datastore/migration/006_log_data_type.go
new file mode 100644
index 000000000..0291edae5
--- /dev/null
+++ b/server/store/datastore/migration/006_log_data_type.go
@@ -0,0 +1,27 @@
+package migration
+
+import (
+	"xorm.io/xorm"
+	"xorm.io/xorm/schemas"
+)
+
+var alterTableLogUpdateColumnLogDataType = task{
+	name: "alter-table-logs-update-type-of-data",
+	fn: func(sess *xorm.Session) (err error) {
+		dialect := sess.Engine().Dialect().URI().DBType
+
+		switch dialect {
+		case schemas.POSTGRES:
+			_, err = sess.Exec("ALTER TABLE logs ALTER COLUMN log_data TYPE BYTEA")
+		case schemas.MYSQL:
+			_, err = sess.Exec("ALTER TABLE logs MODIFY COLUMN log_data LONGBLOB")
+		case schemas.MSSQL:
+			_, err = sess.Exec("ALTER TABLE logs MODIFY COLUMN log_data VARBINARY")
+		default:
+			// sqlite does only know BLOB in all cases
+			return nil
+		}
+
+		return err
+	},
+}
diff --git a/server/store/datastore/migration/migration.go b/server/store/datastore/migration/migration.go
index 7c165c433..bc5f6e814 100644
--- a/server/store/datastore/migration/migration.go
+++ b/server/store/datastore/migration/migration.go
@@ -33,6 +33,7 @@ var migrationTasks = []*task{
 	&fixPRSecretEventName,
 	&alterTableReposDropCounter,
 	&dropSenders,
+	&alterTableLogUpdateColumnLogDataType,
 }
 
 var allBeans = []interface{}{