diff --git a/build.zig.zon b/build.zig.zon
index 5de2e40..0cdb35e 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -9,8 +9,8 @@
     },
     .dependencies = .{
         .zigcli = .{
-            .url = "https://github.com/jiacai2050/zigcli/archive/c5e98846758f78083ca3648b841ef67f472ae9b4.tar.gz",
-            .hash = "12200ac6f2432658825c5b3e5ef004a62821ed6e910bbc3a971b98516de9d1783d90",
+            .url = "https://github.com/jiacai2050/zigcli/archive/d48eba82af25c16f01faf759fb9c11aacfe58a99.tar.gz",
+            .hash = "1220e18590afc407a9e947f7c724a4be509adbbab916a5253efc0bb07457de955bf1",
         },
     },
 }
diff --git a/src/12-03.zig b/src/12-03.zig
index 8b48239..33bd61d 100644
--- a/src/12-03.zig
+++ b/src/12-03.zig
@@ -112,10 +112,6 @@ fn DoublyLinkedList(comptime T: type) type {
             return false;
         }
 
-        fn len(self: *Self) usize {
-            return self.len;
-        }
-
         fn search(self: *Self, value: T) bool {
             var current: ?*Node = self.head;
 
diff --git a/src/13-01.zig b/src/13-01.zig
index f6fd216..d52d3a8 100644
--- a/src/13-01.zig
+++ b/src/13-01.zig
@@ -46,12 +46,12 @@ pub fn main() !void {
     }
 
     print("\n{s}Positionals{s}\n", .{ sep, sep });
-    for (opt.positional_args.items, 0..) |arg, idx| {
+    for (opt.positional_args, 0..) |arg, idx| {
         print("{d}: {s}\n", .{ idx + 1, arg });
     }
 
     // Provide a print_help util method
     print("\n{s}print_help{s}\n", .{ sep, sep });
     const stdout = std.io.getStdOut();
-    try opt.print_help(stdout.writer());
+    try opt.printHelp(stdout.writer());
 }