diff --git a/olgram/migrations/models/22_20240317143246_update.sql b/olgram/migrations/models/22_20240317143246_update.sql
new file mode 100644
index 0000000..481ae91
--- /dev/null
+++ b/olgram/migrations/models/22_20240317143246_update.sql
@@ -0,0 +1,4 @@
+-- upgrade --
+ALTER TABLE "bot_start_message" ALTER COLUMN "locale" TYPE VARCHAR(15) USING "locale"::VARCHAR(15);
+-- downgrade --
+ALTER TABLE "bot_start_message" ALTER COLUMN "locale" TYPE VARCHAR(5) USING "locale"::VARCHAR(5);
diff --git a/olgram/models/models.py b/olgram/models/models.py
index dec7808..639fa46 100644
--- a/olgram/models/models.py
+++ b/olgram/models/models.py
@@ -77,7 +77,7 @@ class Bot(Model):
 class BotStartMessage(Model):
     id = fields.IntField(pk=True)
     bot = fields.ForeignKeyField("models.Bot", related_name="start_texts", on_delete=fields.CASCADE)
-    locale = fields.CharField(max_length=5)
+    locale = fields.CharField(max_length=15)
     text = fields.TextField()
 
     class Meta: