diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 53c9db59b..05bffef2b 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -713,7 +713,7 @@ Books on general-purpose programming that don't focus on a specific language are
 #### Phoenix
 
 * [Phoenix Framework Guide](https://hexdocs.pm/phoenix/overview.html) (HTML)
-* [Versioned APIs with Phoenix](https://elviovicosa.com/freebies/versioned-apis-with-phoenix-by-elvio-vicosa.pdf) - Elvio Vicosa (PDF)
+* [Versioned APIs with Phoenix](https://web.archive.org/web/20210309052043/https://elviovicosa.com/freebies/versioned-apis-with-phoenix-by-elvio-vicosa.pdf) - Elvio Vicosa (PDF) *(:card_file_box: archived)*
 
 
 ### Embedded Systems