diff --git a/src/lib.rs b/src/lib.rs
index bdad41d..bf06c8b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,6 +2,7 @@
 #![feature(array_windows)]
 #![feature(decl_macro)]
 #![feature(iter_array_chunks)]
+#![feature(binary_heap_into_iter_sorted)]
 
 pub mod days;
 pub mod utils;