diff --git a/rust-toolchain b/rust-toolchain
index d2d6255..7cc6ef4 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.51.0
\ No newline at end of file
+1.63.0
\ No newline at end of file
diff --git a/saffron/src/describe/english.rs b/saffron/src/describe/english.rs
index b641e36..ea6a575 100644
--- a/saffron/src/describe/english.rs
+++ b/saffron/src/describe/english.rs
@@ -87,7 +87,7 @@ impl English {
             ),
         })
     }
-    fn hour<'a>(&'a self, h: OrsExpr<Hour>) -> impl Display + 'a {
+    fn hour(&self, h: OrsExpr<Hour>) -> impl Display + '_ {
         display(move |f| match h {
             OrsExpr::One(hour) => write!(
                 f,
diff --git a/saffron/src/lib.rs b/saffron/src/lib.rs
index afeae71..c41df41 100644
--- a/saffron/src/lib.rs
+++ b/saffron/src/lib.rs
@@ -1078,14 +1078,14 @@ impl Cron {
         }
 
         let front = match bounds.start_bound() {
-            Bound::Unbounded => Some(chrono::MIN_DATETIME),
+            Bound::Unbounded => Some(DateTime::<Utc>::MIN_UTC),
             Bound::Included(start) => Some(*start),
             Bound::Excluded(start) => next_minute(*start),
         }
         .map(minute_floor);
 
         let back = match bounds.end_bound() {
-            Bound::Unbounded => Some(chrono::MAX_DATETIME),
+            Bound::Unbounded => Some(DateTime::<Utc>::MAX_UTC),
             Bound::Included(end) => Some(*end),
             Bound::Excluded(end) => previous_minute(*end),
         }
@@ -1113,7 +1113,7 @@ impl Cron {
     pub fn next_from(&self, start: DateTime<Utc>) -> Option<DateTime<Utc>> {
         let start = minute_floor(start);
         if self.any() {
-            self.find_next(start, chrono::MAX_DATETIME)
+            self.find_next(start, DateTime::<Utc>::MAX_UTC)
         } else {
             None
         }
@@ -1134,7 +1134,7 @@ impl Cron {
     pub fn next_after(&self, start: DateTime<Utc>) -> Option<DateTime<Utc>> {
         let start = next_minute(minute_floor(start))?;
         if self.any() {
-            self.find_next(start, chrono::MAX_DATETIME)
+            self.find_next(start, DateTime::<Utc>::MAX_UTC)
         } else {
             None
         }
@@ -1935,7 +1935,7 @@ mod tests {
 
             let results = cron.iter((start, end)).collect::<Vec<_>>();
             let times = times
-                .into_iter()
+                .iter()
                 .map(|&time| {
                     Utc.datetime_from_str(time, FORMAT)
                         .expect("Failed to parse expected date")
@@ -1994,7 +1994,7 @@ mod tests {
             assert(
                 "* * * * *",
                 (
-                    Bound::Excluded(&chrono::MAX_DATETIME.format(FORMAT).to_string().as_str()),
+                    Bound::Excluded(&DateTime::<Utc>::MAX_UTC.format(FORMAT).to_string().as_str()),
                     Bound::Unbounded,
                 ),
                 &[],
@@ -2007,7 +2007,7 @@ mod tests {
                 "* * * * *",
                 (
                     Bound::Unbounded,
-                    Bound::Excluded(chrono::MIN_DATETIME.format(FORMAT).to_string().as_str()),
+                    Bound::Excluded(DateTime::<Utc>::MIN_UTC.format(FORMAT).to_string().as_str()),
                 ),
                 &[],
             )
diff --git a/saffron/src/parse.rs b/saffron/src/parse.rs
index 48a865d..730b6c1 100644
--- a/saffron/src/parse.rs
+++ b/saffron/src/parse.rs
@@ -161,7 +161,7 @@ impl TryFrom<u8> for DayOfMonth {
 
     #[inline]
     fn try_from(value: u8) -> Result<Self, Self::Error> {
-        if value >= Self::MIN && value <= Self::MAX {
+        if (Self::MIN..=Self::MAX).contains(&value) {
             Ok(Self(value))
         } else {
             Err(ValueOutOfRangeError)
@@ -201,7 +201,7 @@ impl TryFrom<u8> for DayOfMonthOffset {
 
     #[inline]
     fn try_from(value: u8) -> Result<Self, Self::Error> {
-        if value >= Self::MIN && value <= Self::MAX {
+        if (Self::MIN..=Self::MAX).contains(&value) {
             Ok(Self(value))
         } else {
             Err(ValueOutOfRangeError)
@@ -281,7 +281,7 @@ impl TryFrom<u8> for Month {
 
     #[inline]
     fn try_from(value: u8) -> Result<Self, Self::Error> {
-        if value >= Self::MIN && value <= Self::MAX {
+        if (Self::MIN..=Self::MAX).contains(&value) {
             Ok(Self(value))
         } else {
             Err(ValueOutOfRangeError)
@@ -321,7 +321,7 @@ impl TryFrom<u8> for NthDay {
 
     #[inline]
     fn try_from(value: u8) -> Result<Self, Self::Error> {
-        if value >= Self::MIN && value <= Self::MAX {
+        if (Self::MIN..=Self::MAX).contains(&value) {
             Ok(Self(value))
         } else {
             Err(ValueOutOfRangeError)
@@ -717,11 +717,7 @@ where
 }
 
 /// Consumes a set of trailing ORS expressions
-fn tail_ors_exprs<'a, E, F>(
-    mut input: &'a str,
-    f: F,
-    mut exprs: Exprs<E>,
-) -> IResult<&'a str, Exprs<E>>
+fn tail_ors_exprs<E, F>(mut input: &str, f: F, mut exprs: Exprs<E>) -> IResult<&str, Exprs<E>>
 where
     E: ExprValue + TryFrom<u8, Error = ValueOutOfRangeError> + Ord + Copy,
     F: Fn(&str) -> IResult<&str, E>,
@@ -747,7 +743,6 @@ where
     F: Fn(&str) -> IResult<&str, E>,
 {
     move |mut input: &str| {
-        let expressions: Exprs<E>;
         // Attempt to read a `*`. If that succeeds,
         // try to read a `/` for a step expr.
         // If this isn't a step expr, return Expr::All,
@@ -755,7 +750,7 @@ where
         // list with an ors_expr.
         let star = opt(char('*'))(input)?;
         input = star.0;
-        if star.1.is_some() {
+        let expressions = if star.1.is_some() {
             let slash = opt(char('/'))(input)?;
             input = slash.0;
             // If there is no slash after this, just return All and expect the next
@@ -765,7 +760,7 @@ where
             }
             let step = step_digit::<E>()(input)?;
             input = step.0;
-            expressions = Exprs::new(OrsExpr::Step {
+            Exprs::new(OrsExpr::Step {
                 start: ExprValue::min(),
                 end: ExprValue::max(),
                 step: step.1,
@@ -773,8 +768,8 @@ where
         } else {
             let expr = ors_expr::<E, _>(&f)(input)?;
             input = expr.0;
-            expressions = Exprs::new(expr.1)
-        }
+            Exprs::new(expr.1)
+        };
 
         let (input, exprs) = tail_ors_exprs(input, &f, expressions)?;