diff --git a/Source/AaxDecrypter/AaxDecrypter.csproj b/Source/AaxDecrypter/AaxDecrypter.csproj
index ee73efcd..0e9ee5eb 100644
--- a/Source/AaxDecrypter/AaxDecrypter.csproj
+++ b/Source/AaxDecrypter/AaxDecrypter.csproj
@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AAXClean" Version="0.4.6" />
+    <PackageReference Include="AAXClean" Version="0.4.7" />
     <PackageReference Include="AAXClean.Codecs" Version="0.2.7" />
   </ItemGroup>
 
diff --git a/Source/FileLiberator/DownloadDecryptBook.cs b/Source/FileLiberator/DownloadDecryptBook.cs
index ef54d81d..895cda16 100644
--- a/Source/FileLiberator/DownloadDecryptBook.cs
+++ b/Source/FileLiberator/DownloadDecryptBook.cs
@@ -71,8 +71,9 @@ namespace FileLiberator
                         new StatusHandler { "Decrypt failed" };
                 }
 
-                // moves new files from temp dir to final dest
-                var movedAudioFile = moveFilesToBooksDir(libraryBook, entries);
+                // moves new files from temp dir to final dest.
+                // This could take a few seconds i moving hundreds of files.
+                var movedAudioFile = await Task.Run(() => moveFilesToBooksDir(libraryBook, entries));
 
                 // decrypt failed
                 if (!movedAudioFile)