diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 87aac20..9809b24 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -40,8 +40,10 @@ jobs:
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: "1.53.0"
+          toolchain: "1.60.0"
           override: true
+      - name: Use Cargo.lock.msrv
+        run: cp Cargo.lock.msrv Cargo.lock
       - name: Test
         run: |
           cargo test
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4f38ab6..e2f60af 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,10 @@
 Changelog
 =========
 
+## [0.5.3] — 2024-12-12
+
+-   Bump MSRV to 1.60.0 and use Edition 2021 (#30)
+
 ## [0.5.2] — 2022-12-22
 
 -   Support cast to self, useful in generics (#28)
diff --git a/Cargo.lock.msrv b/Cargo.lock.msrv
new file mode 100644
index 0000000..58b02aa
--- /dev/null
+++ b/Cargo.lock.msrv
@@ -0,0 +1,16 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "easy-cast"
+version = "0.5.3"
+dependencies = [
+ "libm",
+]
+
+[[package]]
+name = "libm"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3bda4c6077b0b08da2c48b172195795498381a7c8988c9e6212a6c55c5b9bd70"
diff --git a/Cargo.toml b/Cargo.toml
index 32538fd..233eb10 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,14 +1,20 @@
 [package]
 name = "easy-cast"
-version = "0.5.2"
+version = "0.5.3"
 authors = ["Diggory Hardy <git@dhardy.name>"]
-edition = "2018"
+edition = "2021"
 license = "Apache-2.0"
 description = "Type conversions which are expected to succeed"
 readme = "README.md"
 documentation = "https://docs.rs/easy-cast/"
 keywords = ["cast", "into", "from", "conversion"]
 repository = "https://github.com/kas-gui/easy-cast"
+rust-version = "1.60.0"
+
+[package.metadata.docs.rs]
+features = []
+# To build locally:
+# RUSTDOCFLAGS="--cfg docsrs" cargo +nightly doc --open
 
 [features]
 default = ["std"]
@@ -16,6 +22,9 @@ default = ["std"]
 # Without std, float conversions are disabled (unless libm is used)
 std = []
 
+# libm may be used instead of std to provide float conversions
+libm = ["dep:libm"]
+
 # Note: assertions are always used in debug builds; these only affect release builds:
 
 # Always use all assertions
@@ -31,6 +40,5 @@ assert_int = []
 assert_digits = []
 
 [dependencies.libm]
-# libm may be used instead of std to provide float conversions
 version = "0.2.1"
 optional = true
diff --git a/src/impl_basic.rs b/src/impl_basic.rs
index 5a121fb..a9ef626 100644
--- a/src/impl_basic.rs
+++ b/src/impl_basic.rs
@@ -133,9 +133,7 @@ impl Conv<()> for () {
         Ok(())
     }
     #[inline]
-    fn conv(_: ()) -> Self {
-        ()
-    }
+    fn conv(_: ()) -> Self {}
 }
 impl<S0, T0: Conv<S0>> Conv<(S0,)> for (T0,) {
     #[inline]
diff --git a/src/impl_float.rs b/src/impl_float.rs
index d86e851..f841389 100644
--- a/src/impl_float.rs
+++ b/src/impl_float.rs
@@ -7,6 +7,7 @@
 
 use super::*;
 
+#[allow(clippy::manual_range_contains)]
 impl ConvApprox<f64> for f32 {
     fn try_conv_approx(x: f64) -> Result<f32> {
         use core::num::FpCategory;
@@ -80,7 +81,6 @@ impl FloatRound for f64 {
 }
 
 #[cfg(any(feature = "std", feature = "libm"))]
-#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "libm"))))]
 macro_rules! impl_float {
     ($x:ty: $y:tt) => {
         impl ConvFloat<$x> for $y {
@@ -140,8 +140,8 @@ macro_rules! impl_float {
             #[inline]
             fn try_conv_trunc(x: $x) -> Result<Self> {
                 // Tested: these limits work for $x=f32 and all $y except u128
-                const LBOUND: $x = core::$y::MIN as $x - 1.0;
-                const UBOUND: $x = core::$y::MAX as $x + 1.0;
+                const LBOUND: $x = $y::MIN as $x - 1.0;
+                const UBOUND: $x = $y::MAX as $x + 1.0;
                 if x > LBOUND && x < UBOUND {
                     Ok(x as $y)
                 } else {
@@ -151,10 +151,10 @@ macro_rules! impl_float {
             #[inline]
             fn try_conv_nearest(x: $x) -> Result<Self> {
                 // Tested: these limits work for $x=f32 and all $y except u128
-                const LBOUND: $x = core::$y::MIN as $x;
-                const UBOUND: $x = core::$y::MAX as $x + 1.0;
+                const LBOUND: $x = $y::MIN as $x;
+                const UBOUND: $x = $y::MAX as $x + 1.0;
                 let x = x.round();
-                if x >= LBOUND && x < UBOUND {
+                if (LBOUND..UBOUND).contains(&x) {
                     Ok(x as $y)
                 } else {
                     Err(Error::Range)
@@ -163,10 +163,10 @@ macro_rules! impl_float {
             #[inline]
             fn try_conv_floor(x: $x) -> Result<Self> {
                 // Tested: these limits work for $x=f32 and all $y except u128
-                const LBOUND: $x = core::$y::MIN as $x;
-                const UBOUND: $x = core::$y::MAX as $x + 1.0;
+                const LBOUND: $x = $y::MIN as $x;
+                const UBOUND: $x = $y::MAX as $x + 1.0;
                 let x = x.floor();
-                if x >= LBOUND && x < UBOUND {
+                if (LBOUND..UBOUND).contains(&x) {
                     Ok(x as $y)
                 } else {
                     Err(Error::Range)
@@ -175,10 +175,10 @@ macro_rules! impl_float {
             #[inline]
             fn try_conv_ceil(x: $x) -> Result<Self> {
                 // Tested: these limits work for $x=f32 and all $y except u128
-                const LBOUND: $x = core::$y::MIN as $x;
-                const UBOUND: $x = core::$y::MAX as $x + 1.0;
+                const LBOUND: $x = $y::MIN as $x;
+                const UBOUND: $x = $y::MAX as $x + 1.0;
                 let x = x.ceil();
-                if x >= LBOUND && x < UBOUND {
+                if (LBOUND..UBOUND).contains(&x) {
                     Ok(x as $y)
                 } else {
                     Err(Error::Range)
diff --git a/src/impl_int.rs b/src/impl_int.rs
index 79616ac..1ae3847 100644
--- a/src/impl_int.rs
+++ b/src/impl_int.rs
@@ -53,15 +53,15 @@ macro_rules! impl_via_as_max_check {
             fn conv(x: $x) -> $y {
                 #[cfg(any(debug_assertions, feature = "assert_int"))]
                 assert!(
-                    x <= core::$y::MAX as $x,
+                    x <= $y::MAX as $x,
                     "cast x: {} to {}: expected x <= {}, found x = {}",
-                    stringify!($x), stringify!($y), core::$y::MAX, x
+                    stringify!($x), stringify!($y), $y::MAX, x
                 );
                 x as $y
             }
             #[inline]
             fn try_conv(x: $x) -> Result<Self> {
-                if x <= core::$y::MAX as $x {
+                if x <= $y::MAX as $x {
                     Ok(x as $y)
                 } else {
                     Err(Error::Range)
@@ -90,15 +90,15 @@ macro_rules! impl_via_as_range_check {
             fn conv(x: $x) -> $y {
                 #[cfg(any(debug_assertions, feature = "assert_int"))]
                 assert!(
-                    core::$y::MIN as $x <= x && x <= core::$y::MAX as $x,
+                    $y::MIN as $x <= x && x <= $y::MAX as $x,
                     "cast x: {} to {}: expected {} <= x <= {}, found x = {}",
-                    stringify!($x), stringify!($y), core::$y::MIN, core::$y::MAX, x
+                    stringify!($x), stringify!($y), $y::MIN, $y::MAX, x
                 );
                 x as $y
             }
             #[inline]
             fn try_conv(x: $x) -> Result<Self> {
-                if core::$y::MIN as $x <= x && x <= core::$y::MAX as $x {
+                if $y::MIN as $x <= x && x <= $y::MAX as $x {
                     Ok(x as $y)
                 } else {
                     Err(Error::Range)
@@ -123,8 +123,8 @@ macro_rules! impl_int_generic {
             #[allow(unused_comparisons)]
             #[inline]
             fn conv(x: $x) -> $y {
-                let src_is_signed = core::$x::MIN != 0;
-                let dst_is_signed = core::$y::MIN != 0;
+                let src_is_signed = $x::MIN != 0;
+                let dst_is_signed = $y::MIN != 0;
                 if size_of::<$x>() < size_of::<$y>() {
                     if !dst_is_signed {
                         #[cfg(any(debug_assertions, feature = "assert_int"))]
@@ -138,9 +138,9 @@ macro_rules! impl_int_generic {
                     if dst_is_signed {
                         #[cfg(any(debug_assertions, feature = "assert_int"))]
                         assert!(
-                            x <= core::$y::MAX as $x,
+                            x <= $y::MAX as $x,
                             "cast x: {} to {}: expected x <= {}, found x = {}",
-                            stringify!($x), stringify!($y), core::$y::MAX, x
+                            stringify!($x), stringify!($y), $y::MAX, x
                         );
                     } else if src_is_signed {
                         #[cfg(any(debug_assertions, feature = "assert_int"))]
@@ -155,16 +155,16 @@ macro_rules! impl_int_generic {
                     if src_is_signed {
                         #[cfg(any(debug_assertions, feature = "assert_int"))]
                         assert!(
-                            core::$y::MIN as $x <= x && x <= core::$y::MAX as $x,
+                            $y::MIN as $x <= x && x <= $y::MAX as $x,
                             "cast x: {} to {}: expected {} <= x <= {}, found x = {}",
-                            stringify!($x), stringify!($y), core::$y::MIN, core::$y::MAX, x
+                            stringify!($x), stringify!($y), $y::MIN, $y::MAX, x
                         );
                     } else {
                         #[cfg(any(debug_assertions, feature = "assert_int"))]
                         assert!(
-                            x <= core::$y::MAX as $x,
+                            x <= $y::MAX as $x,
                             "cast x: {} to {}: expected x <= {}, found x = {}",
-                            stringify!($x), stringify!($y), core::$y::MAX, x
+                            stringify!($x), stringify!($y), $y::MAX, x
                         );
                     }
                 }
@@ -173,15 +173,15 @@ macro_rules! impl_int_generic {
             #[allow(unused_comparisons)]
             #[inline]
             fn try_conv(x: $x) -> Result<Self> {
-                let src_is_signed = core::$x::MIN != 0;
-                let dst_is_signed = core::$y::MIN != 0;
+                let src_is_signed = $x::MIN != 0;
+                let dst_is_signed = $y::MIN != 0;
                 if size_of::<$x>() < size_of::<$y>() {
                     if dst_is_signed || x >= 0 {
                         return Ok(x as $y);
                     }
                 } else if size_of::<$x>() == size_of::<$y>() {
                     if dst_is_signed {
-                        if x <= core::$y::MAX as $x {
+                        if x <= $y::MAX as $x {
                             return Ok(x as $y);
                         }
                     } else if src_is_signed {
@@ -195,11 +195,11 @@ macro_rules! impl_int_generic {
                 } else {
                     // src size > dst size
                     if src_is_signed {
-                        if core::$y::MIN as $x <= x && x <= core::$y::MAX as $x {
+                        if $y::MIN as $x <= x && x <= $y::MAX as $x {
                             return Ok(x as $y);
                         }
                     } else {
-                        if x <= core::$y::MAX as $x {
+                        if x <= $y::MAX as $x {
                             return Ok(x as $y);
                         }
                     }
@@ -249,7 +249,7 @@ macro_rules! impl_via_digits_check {
             fn try_conv(x: $x) -> Result<Self> {
                 let src_ty_bits = (size_of::<$x>() * 8) as u32;
                 let src_digits = src_ty_bits.saturating_sub(x.leading_zeros() + x.trailing_zeros());
-                let dst_digits = core::$y::MANTISSA_DIGITS;
+                let dst_digits = $y::MANTISSA_DIGITS;
                 if src_digits <= dst_digits {
                     Ok(x as $y)
                 } else {
@@ -286,7 +286,7 @@ macro_rules! impl_via_digits_check_signed {
                 let src_digits = x.checked_abs()
                     .map(|y| src_ty_bits.saturating_sub(y.leading_zeros() + y.trailing_zeros()))
                     .unwrap_or(1 /*MIN has one binary digit in float repr*/);
-                let dst_digits = core::$y::MANTISSA_DIGITS;
+                let dst_digits = $y::MANTISSA_DIGITS;
                 if src_digits <= dst_digits {
                     Ok(x as $y)
                 } else {
diff --git a/src/lib.rs b/src/lib.rs
index aa7d539..b126e5b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -59,7 +59,7 @@
 
 #![deny(missing_docs)]
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(doc_cfg, feature(doc_cfg))]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
 mod impl_basic;
 mod impl_float;
diff --git a/src/traits.rs b/src/traits.rs
index 55b2f1c..33a1ab8 100644
--- a/src/traits.rs
+++ b/src/traits.rs
@@ -216,7 +216,6 @@ impl<S, T: ConvApprox<S>> CastApprox<T> for S {
 ///
 /// The sister-trait [`CastFloat`] supports "into" style usage.
 #[cfg(any(feature = "std", feature = "libm"))]
-#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "libm"))))]
 pub trait ConvFloat<T>: Sized {
     /// Try converting to integer with truncation
     ///
@@ -280,7 +279,6 @@ pub trait ConvFloat<T>: Sized {
 /// This trait is automatically implemented for every implementation of
 /// [`ConvFloat`].
 #[cfg(any(feature = "std", feature = "libm"))]
-#[cfg_attr(doc_cfg, doc(cfg(any(feature = "std", feature = "libm"))))]
 pub trait CastFloat<T> {
     /// Cast to integer, truncating
     ///