diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 715f148..5c328f8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        rust: [stable, 1.84.0]
+        rust: [stable, 1.85.0]
     steps:
       - name: Install Rust
         uses: hecrj/setup-rust-action@v1
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d6c21ef..16f165d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ file is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and
 this project adheres to [Semantic
 Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Changed
+
+- Requires Rust 1.85 or newer.
+
 ## [0.16.0] - 2025-10-06
 
 ### Changed
@@ -193,6 +199,7 @@ Versioning](https://semver.org/spec/v2.0.0.html).
   column-oriented form.
 - Interface to read CSV data into `Table`.
 
+[Unreleased]: https://github.com/petabi/structured/compare/0.16.0...main
 [0.16.0]: https://github.com/petabi/structured/compare/0.15.0...0.16.0
 [0.15.0]: https://github.com/petabi/structured/compare/0.14.1...0.15.0
 [0.14.1]: https://github.com/petabi/structured/compare/0.14.0...0.14.1
diff --git a/Cargo.toml b/Cargo.toml
index 9849a55..66f73e0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,8 +6,8 @@ authors = [
   "Min Shao <min.shao1988@gmail.com>",
   "Sehkone Kim <sehkone@petabi.com>",
 ]
-edition = "2021"
-rust-version = "1.84"
+edition = "2024"
+rust-version = "1.85"
 description = "Data structures to handle large, structured data."
 homepage = "https://github.com/petabi/structured"
 repository = "https://github.com/petabi/structured"
diff --git a/src/csv.rs b/src/csv.rs
index 196c3f0..056aefe 100644
--- a/src/csv.rs
+++ b/src/csv.rs
@@ -2,7 +2,7 @@
 
 pub(crate) mod reader;
 
-pub use reader::infer_schema;
 pub use reader::Config;
 pub use reader::FieldParser;
+pub use reader::infer_schema;
 pub use reader::{Reader, Record};
diff --git a/src/csv/reader.rs b/src/csv/reader.rs
index 1c0e225..efc455f 100644
--- a/src/csv/reader.rs
+++ b/src/csv/reader.rs
@@ -478,8 +478,8 @@ mod tests {
 
     use arrow::array::{Array, BinaryArray, StringArray};
     use itertools::izip;
-    use jiff::civil::{date, DateTime};
-    use serde_test::{assert_tokens, Token};
+    use jiff::civil::{DateTime, date};
+    use serde_test::{Token, assert_tokens};
 
     use super::*;
     use crate::table::Column;
@@ -602,11 +602,13 @@ mod tests {
             Field::new("", DataType::Utf8, false),
         ];
 
-        assert!(schema
-            .fields()
-            .into_iter()
-            .zip(answers.into_iter())
-            .all(|(a, b)| a.data_type() == b.data_type()));
+        assert!(
+            schema
+                .fields()
+                .into_iter()
+                .zip(answers.into_iter())
+                .all(|(a, b)| a.data_type() == b.data_type())
+        );
     }
 
     #[test]
diff --git a/src/stats.rs b/src/stats.rs
index 01a4f6e..edf52e6 100644
--- a/src/stats.rs
+++ b/src/stats.rs
@@ -569,7 +569,7 @@ where
     for (k, v) in &count {
         top_n.push(((*k).clone(), *v));
     }
-    top_n.sort_unstable_by(|a, b| b.1.cmp(&a.1));
+    top_n.sort_unstable_by_key(|a| std::cmp::Reverse(a.1));
     top_n
 }
 
@@ -589,7 +589,7 @@ where
         .into_iter()
         .collect();
 
-    freqs.sort_unstable_by(|a, b| b.1.cmp(&a.1));
+    freqs.sort_unstable_by_key(|a| std::cmp::Reverse(a.1));
 
     (
         freqs.len(),
diff --git a/src/table.rs b/src/table.rs
index 9552b6e..78bc1f9 100644
--- a/src/table.rs
+++ b/src/table.rs
@@ -6,9 +6,9 @@ use std::sync::Arc;
 use std::vec;
 
 use arrow::array::{
-    Array, BinaryArray, Float32Array, Float64Array, Int16Array, Int32Array, Int64Array, Int8Array,
-    PrimitiveArray, PrimitiveBuilder, StringArray, UInt16Array, UInt32Array, UInt64Array,
-    UInt8Array,
+    Array, BinaryArray, Float32Array, Float64Array, Int8Array, Int16Array, Int32Array, Int64Array,
+    PrimitiveArray, PrimitiveBuilder, StringArray, UInt8Array, UInt16Array, UInt32Array,
+    UInt64Array,
 };
 use arrow::datatypes::{ArrowPrimitiveType, DataType, Int64Type, Schema, TimeUnit};
 use num_traits::ToPrimitive;
@@ -16,9 +16,9 @@ use serde::{Deserialize, Serialize};
 use strum_macros::EnumString;
 
 use crate::stats::{
-    convert_time_intervals, describe, n_largest_count, n_largest_count_datetime,
-    n_largest_count_enum, n_largest_count_float64, ColumnStatistics, GroupCount, GroupElement,
-    GroupElementCount,
+    ColumnStatistics, GroupCount, GroupElement, GroupElementCount, convert_time_intervals,
+    describe, n_largest_count, n_largest_count_datetime, n_largest_count_enum,
+    n_largest_count_float64,
 };
 
 type ReverseEnumMaps = HashMap<usize, HashMap<u64, Vec<String>>>;