diff --git a/src/Infrastructure/TakeoutSaaS.Infrastructure/Identity/Persistence/IdentityDbContext.cs b/src/Infrastructure/TakeoutSaaS.Infrastructure/Identity/Persistence/IdentityDbContext.cs
index b2b4804..cb4212e 100644
--- a/src/Infrastructure/TakeoutSaaS.Infrastructure/Identity/Persistence/IdentityDbContext.cs
+++ b/src/Infrastructure/TakeoutSaaS.Infrastructure/Identity/Persistence/IdentityDbContext.cs
@@ -93,7 +93,7 @@ public sealed class IdentityDbContext(
         builder.Property(x => x.Account).HasMaxLength(64).IsRequired();
         builder.Property(x => x.DisplayName).HasMaxLength(64).IsRequired();
         builder.Property(x => x.PasswordHash).HasMaxLength(256).IsRequired();
-        builder.Property(x => x.Avatar).HasMaxLength(256);
+        builder.Property(x => x.Avatar).HasColumnType("text");
         builder.Property(x => x.TenantId).IsRequired();
         ConfigureAuditableEntity(builder);
         ConfigureSoftDeleteEntity(builder);
@@ -114,7 +114,7 @@ public sealed class IdentityDbContext(
         builder.Property(x => x.OpenId).HasMaxLength(128).IsRequired();
         builder.Property(x => x.UnionId).HasMaxLength(128);
         builder.Property(x => x.Nickname).HasMaxLength(64).IsRequired();
-        builder.Property(x => x.Avatar).HasMaxLength(256);
+        builder.Property(x => x.Avatar).HasColumnType("text");
         ConfigureAuditableEntity(builder);
         ConfigureSoftDeleteEntity(builder);