diff --git a/aoc_2025/src/day1.rs b/aoc_2025/src/day1.rs
index 79c5305..3e07b5e 100644
--- a/aoc_2025/src/day1.rs
+++ b/aoc_2025/src/day1.rs
@@ -1,4 +1,4 @@
-use crate::{AoC, SimpleDay};
+use crate::{AoC, WinnowDay};
 use winnow::{
     Parser, Result,
     ascii::{digit1, multispace0},
@@ -11,13 +11,12 @@ enum Side {
     Right(i64),
 }
 
-fn day() -> impl SimpleDay {
+fn day() -> impl WinnowDay {
     AoC::new(parse as _, part1 as _, part2 as _)
 }
 
-fn parse(input: String) -> Parsed {
-    let mut input: &str = input.as_str();
-    repeat(1.., parse_line).parse_next(&mut input).unwrap()
+fn parse(input: &mut &str) -> Result<Parsed> {
+    repeat(1.., parse_line).parse_next(input)
 }
 
 fn parse_line(input: &mut &str) -> Result<Side> {
diff --git a/aoc_2025/src/day2.rs b/aoc_2025/src/day2.rs
index dda0563..1cbfccd 100644
--- a/aoc_2025/src/day2.rs
+++ b/aoc_2025/src/day2.rs
@@ -1,4 +1,4 @@
-use crate::{AoC, SimpleDay};
+use crate::{AoC, WinnowDay};
 use winnow::{
     Parser, Result,
     ascii::digit1,
@@ -7,15 +7,12 @@ use winnow::{
 
 type Parsed = Vec<(u64, u64)>;
 
-fn day() -> impl SimpleDay {
+fn day() -> impl WinnowDay {
     AoC::new(parse as _, part1 as _, part2 as _)
 }
 
-fn parse(input: String) -> Parsed {
-    let mut input: &str = input.as_str();
-    separated(1.., parse_range, ",")
-        .parse_next(&mut input)
-        .unwrap()
+fn parse(input: &mut &str) -> Result<Parsed> {
+    separated(1.., parse_range, ",").parse_next(input)
 }
 
 fn parse_range(input: &mut &str) -> Result<(u64, u64)> {