diff --git a/2025/day-01/Cargo.toml b/2025/day-01/Cargo.toml
new file mode 100644
index 0000000..2772f63
--- /dev/null
+++ b/2025/day-01/Cargo.toml
@@ -0,0 +1,27 @@
+[package]
+name = "day-01"
+version = "0.1.0"
+edition = "2024"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+itertools.workspace = true
+nom.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+miette.workspace = true
+thiserror.workspace = true
+
+[dev-dependencies]
+divan.workspace = true
+rstest.workspace = true
+test-log.workspace = true
+
+[[bench]]
+name = "day-01-bench"
+path = "benches/benchmarks.rs"
+harness = false
+
+[lints]
+workspace = true
diff --git a/2025/day-01/benches/benchmarks.rs b/2025/day-01/benches/benchmarks.rs
new file mode 100644
index 0000000..cfb21dd
--- /dev/null
+++ b/2025/day-01/benches/benchmarks.rs
@@ -0,0 +1,21 @@
+use day_01::*;
+
+fn main() {
+    divan::main();
+}
+
+#[divan::bench]
+fn part1() {
+    part1::process(divan::black_box(include_str!(
+        "../input1.txt",
+    )))
+    .unwrap();
+}
+
+#[divan::bench]
+fn part2() {
+    part2::process(divan::black_box(include_str!(
+        "../input2.txt",
+    )))
+    .unwrap();
+}
diff --git a/2025/day-01/src/bin/part1.rs b/2025/day-01/src/bin/part1.rs
new file mode 100644
index 0000000..fb3512a
--- /dev/null
+++ b/2025/day-01/src/bin/part1.rs
@@ -0,0 +1,12 @@
+use day_01::part1::process;
+use miette::{Context, Result};
+
+#[tracing::instrument]
+fn main() -> Result<()> {
+    tracing_subscriber::fmt::init();
+
+    let file = include_str!("../../input1.txt");
+    let result = process(file).context("process part 1")?;
+    println!("{result}");
+    Ok(())
+}
diff --git a/2025/day-01/src/bin/part2.rs b/2025/day-01/src/bin/part2.rs
new file mode 100644
index 0000000..1364b93
--- /dev/null
+++ b/2025/day-01/src/bin/part2.rs
@@ -0,0 +1,12 @@
+use day_01::part2::process;
+use miette::{Context, Result};
+
+#[tracing::instrument]
+fn main() -> Result<()> {
+    tracing_subscriber::fmt::init();
+
+    let file = include_str!("../../input2.txt");
+    let result = process(file).context("process part 2")?;
+    println!("{result}");
+    Ok(())
+}
diff --git a/2025/day-01/src/lib.rs b/2025/day-01/src/lib.rs
new file mode 100644
index 0000000..faaf542
--- /dev/null
+++ b/2025/day-01/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod part1;
+pub mod part2;
diff --git a/2025/day-01/src/part1.rs b/2025/day-01/src/part1.rs
new file mode 100644
index 0000000..94144f7
--- /dev/null
+++ b/2025/day-01/src/part1.rs
@@ -0,0 +1,21 @@
+use miette::Result;
+
+#[tracing::instrument]
+pub fn process(input: &str) -> Result<usize> {
+    todo!("day xx - part 1");
+    Ok(0)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_process() -> Result<()> {
+        let input = "";
+        todo!("haven't built test yet");
+        let result = 0;
+        assert_eq!(process(input)?, result);
+        Ok(())
+    }
+}
diff --git a/2025/day-01/src/part2.rs b/2025/day-01/src/part2.rs
new file mode 100644
index 0000000..cbcdee4
--- /dev/null
+++ b/2025/day-01/src/part2.rs
@@ -0,0 +1,21 @@
+use miette::Result;
+
+#[tracing::instrument]
+pub fn process(input: &str) -> Result<usize> {
+    todo!("day xx - part 2");
+    Ok(0)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_process() -> Result<()> {
+        let input = "";
+        todo!("haven't built test yet");
+        let result = 0;
+        assert_eq!(process(input)?, result);
+        Ok(())
+    }
+}