diff --git a/Conjuga/Conjuga/Services/DataLoader.swift b/Conjuga/Conjuga/Services/DataLoader.swift
index e1d8bf6..0ca8762 100644
--- a/Conjuga/Conjuga/Services/DataLoader.swift
+++ b/Conjuga/Conjuga/Services/DataLoader.swift
@@ -9,7 +9,7 @@ actor DataLoader {
     static let textbookDataVersion = 14
     static let textbookDataKey = "textbookDataVersion"
 
-    static let bookDataVersion = 3  // bump: robust bundle lookup with explicit-slug fallback
+    static let bookDataVersion = 4  // bump: force re-seed for installs where books didn't persist
     static let bookDataKey = "bookDataVersion"
 
     /// Quick check: does the DB need seeding or course data refresh?