diff --git a/DataLayer/UNTESTED/EfClasses/Book.cs b/DataLayer/UNTESTED/EfClasses/Book.cs
index fc224c0f..18d4f282 100644
--- a/DataLayer/UNTESTED/EfClasses/Book.cs
+++ b/DataLayer/UNTESTED/EfClasses/Book.cs
@@ -66,7 +66,7 @@ namespace DataLayer
             int lengthInMinutes,
 			IEnumerable<Contributor> authors,
 			IEnumerable<Contributor> narrators,
-			Category category)
+			Category category, string localeName)
         {
             // validate
             ArgumentValidator.EnsureNotNull(audibleProductId, nameof(audibleProductId));
@@ -75,6 +75,7 @@ namespace DataLayer
 
 			// assign as soon as possible. stuff below relies on this
             AudibleProductId = productId;
+            Locale = localeName;
 
             ArgumentValidator.EnsureNotNullOrWhiteSpace(title, nameof(title));
 
@@ -243,6 +244,7 @@ namespace DataLayer
 			Category = category;
         }
 
+        // needed for v3 => v4 upgrade
         public void UpdateLocale(string localeName)
             => Locale ??= localeName;
 
diff --git a/DataLayer/UNTESTED/EfClasses/LibraryBook.cs b/DataLayer/UNTESTED/EfClasses/LibraryBook.cs
index d299619f..e58e3929 100644
--- a/DataLayer/UNTESTED/EfClasses/LibraryBook.cs
+++ b/DataLayer/UNTESTED/EfClasses/LibraryBook.cs
@@ -14,13 +14,20 @@ namespace DataLayer
         public string Account { get; private set; }
 
         private LibraryBook() { }
-        public LibraryBook(Book book, DateTime dateAdded)
+        public LibraryBook(Book book, DateTime dateAdded, string account)
         {
             ArgumentValidator.EnsureNotNull(book, nameof(book));
+            ArgumentValidator.EnsureNotNull(account, nameof(account));
+
             Book = book;
             DateAdded = dateAdded;
+            Account = account;
         }
 
-		public override string ToString() => $"{DateAdded:d} {Book}";
+        // needed for v3 => v4 upgrade
+        public void UpdateAccount(string account)
+            => Account ??= account;
+
+        public override string ToString() => $"{DateAdded:d} {Book}";
 	}
 }
diff --git a/DtoImporterService/UNTESTED/BookImporter.cs b/DtoImporterService/UNTESTED/BookImporter.cs
index cfaef4cc..89cbbdf7 100644
--- a/DtoImporterService/UNTESTED/BookImporter.cs
+++ b/DtoImporterService/UNTESTED/BookImporter.cs
@@ -105,7 +105,8 @@ namespace DtoImporterService
 				item.LengthInMinutes,
 				authors,
 				narrators,
-				category)
+				category,
+				Account.Locale.Name)
 			).Entity;
 
 			var publisherName = item.Publisher;
@@ -129,6 +130,7 @@ namespace DtoImporterService
 			book.PictureId = item.PictureId;
 			book.UpdateProductRating(item.Product_OverallStars, item.Product_PerformanceStars, item.Product_StoryStars);
 
+			// needed during v3 => v4 migration
 			book.UpdateLocale(Account.Locale.Name);
 
 			// important to update user-specific info. this will have changed if user has rated/reviewed the book since last library import
diff --git a/DtoImporterService/UNTESTED/LibraryImporter.cs b/DtoImporterService/UNTESTED/LibraryImporter.cs
index 3e9184e7..752ddbc8 100644
--- a/DtoImporterService/UNTESTED/LibraryImporter.cs
+++ b/DtoImporterService/UNTESTED/LibraryImporter.cs
@@ -30,10 +30,16 @@ namespace DtoImporterService
 			{
 				var libraryBook = new LibraryBook(
 					DbContext.Books.Local.Single(b => b.AudibleProductId == newItem.ProductId),
-					newItem.DateAdded);
+					newItem.DateAdded,
+					Account.AccountId);
 				DbContext.Library.Add(libraryBook);
 			}
 
+			// needed for v3 => v4 upgrade
+			var toUpdate = DbContext.Library.Where(l => l.Account == null);
+			foreach (var u in toUpdate)
+				u.UpdateAccount(Account.AccountId);
+
 			var qtyNew = newItems.Count;
 			return qtyNew;
 		}
diff --git a/LibationLauncher/LibationLauncher.csproj b/LibationLauncher/LibationLauncher.csproj
index 75fdece5..2de56fb4 100644
--- a/LibationLauncher/LibationLauncher.csproj
+++ b/LibationLauncher/LibationLauncher.csproj
@@ -13,7 +13,7 @@
     <!-- <PublishSingleFile>true</PublishSingleFile> -->
     <RuntimeIdentifier>win-x64</RuntimeIdentifier>
 
-    <Version>3.1.12.140</Version>
+    <Version>3.1.12.142</Version>
   </PropertyGroup>
 
   <ItemGroup>