--- alexandria-book-collection-manager-0.7.4/lib/alexandria/export_library.rb.export_html	2020-01-03 16:17:05.053552865 +0900
+++ alexandria-book-collection-manager-0.7.4/lib/alexandria/export_library.rb	2020-01-03 16:24:11.989122168 +0900
@@ -302,7 +302,7 @@
           xhtml << <<~EOS
             <img class="book_cover"
                  src="#{File.join('pixmaps', final_cover(book))}"
-                 alt="Cover file for '#{xhtml_escape(book.title)}'"
+                 alt="Cover file for '#{xhtml_escape(book.title).force_encoding("UTF-8")}'"
                  height="#{image_s.height}" width="#{image_s.width}"
             />
           EOS
@@ -314,7 +314,7 @@
 
         unless book.title.nil?
           xhtml << <<~EOS
-            <p class="book_title">#{xhtml_escape(book.title)}</p>
+            <p class="book_title">#{xhtml_escape(book.title).force_encoding("UTF-8")}</p>
           EOS
         end
 
@@ -322,7 +322,7 @@
           xhtml << '<ul class="book_authors">'
           book.authors.each do |author|
             xhtml << <<~EOS
-              <li class="book_author">#{xhtml_escape(author)}</li>
+              <li class="book_author">#{xhtml_escape(author).force_encoding("UTF-8")}</li>
             EOS
           end
           xhtml << "</ul>"
@@ -330,13 +330,13 @@
 
         unless book.edition.nil?
           xhtml << <<~EOS
-            <p class="book_binding">#{xhtml_escape(book.edition)}</p>
+            <p class="book_binding">#{xhtml_escape(book.edition).force_encoding("UTF-8")}</p>
           EOS
         end
 
         unless book.publisher.nil?
           xhtml << <<~EOS
-            <p class="book_publisher">#{xhtml_escape(book.publisher)}</p>
+            <p class="book_publisher">#{xhtml_escape(book.publisher).force_encoding("UTF-8")}</p>
           EOS
         end