diff --git a/doccano/app/db.sqlite3 b/doccano/app/db.sqlite3
index e2b792d2..b10ab909 100644
Binary files a/doccano/app/db.sqlite3 and b/doccano/app/db.sqlite3 differ
diff --git a/doccano/app/server/models.py b/doccano/app/server/models.py
index 4f74b858..a05c947a 100644
--- a/doccano/app/server/models.py
+++ b/doccano/app/server/models.py
@@ -14,8 +14,8 @@ class Project(models.Model):
 
 
 class Label(models.Model):
-    text = models.CharField(max_length=100)
-    shortcut = models.CharField(max_length=10)
+    text = models.CharField(max_length=100, unique=True)
+    shortcut = models.CharField(max_length=10, unique=True)
     project = models.ForeignKey(Project, on_delete=models.CASCADE, null=True)
 
     def as_dict(self):