diff --git a/src/config.cr b/src/config.cr
index 86f2733..aa818c3 100644
--- a/src/config.cr
+++ b/src/config.cr
@@ -11,7 +11,7 @@ class Config
   property session_secret : String = "mango-session-secret"
   property library_path : String = File.expand_path "~/mango/library",
     home: true
-  property library_cache_path = File.expand_path "~/mango/library.yml.cbz",
+  property library_cache_path = File.expand_path "~/mango/library.yml.gz",
     home: true
   property db_path : String = File.expand_path "~/mango/mango.db", home: true
   property scan_interval_minutes : Int32 = 5