diff --git a/advent.ipkg b/advent.ipkg
index e915d93..c9776ba 100644
--- a/advent.ipkg
+++ b/advent.ipkg
@@ -21,6 +21,7 @@ depends = base
         , ansi
         , if-unsolved-implicit
         , c-ffi
+        , refined
 
 -- modules to install
 modules = Runner