diff --git a/src/jar.rs b/src/jar.rs
index 29953103..e39bd58b 100644
--- a/src/jar.rs
+++ b/src/jar.rs
@@ -540,7 +540,7 @@ impl CookieJar {
     /// assert!(matches!(jar.prefixed(Secure).get("h0st"), None));
     /// ```
     #[inline(always)]
-    pub fn prefixed<'a, P: Prefix>(&'a self, prefix: P) -> PrefixedJar<P, &'a Self> {
+    pub fn prefixed<P: Prefix>(&self, prefix: P) -> PrefixedJar<P, &Self> {
         let _ = prefix;
         PrefixedJar::new(self)
     }
@@ -580,7 +580,7 @@ impl CookieJar {
     /// jar.prefixed_mut(Host).remove("one");
     /// assert!(jar.prefixed(Host).get("one").is_none());
     /// ```
-    pub fn prefixed_mut<'a, P: Prefix>(&'a mut self, prefix: P) -> PrefixedJar<P, &'a mut Self> {
+    pub fn prefixed_mut<P: Prefix>(&mut self, prefix: P) -> PrefixedJar<P, &mut Self> {
         let _ = prefix;
         PrefixedJar::new(self)
     }
@@ -616,7 +616,7 @@ impl<'a> Iterator for Iter<'a> {
     fn next(&mut self) -> Option<&'a Cookie<'static>> {
         for cookie in self.delta_cookies.by_ref() {
             if !cookie.removed {
-                return Some(&*cookie);
+                return Some(&**cookie);
             }
         }
 
diff --git a/src/lib.rs b/src/lib.rs
index f666d2c3..07147e95 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -778,7 +778,7 @@ impl<'c> Cookie<'c> {
         match self.domain {
             Some(ref c) => {
                 let domain = c.to_str(self.cookie_string.as_ref());
-                domain.strip_prefix(".").or(Some(domain))
+                domain.strip_prefix('.').or(Some(domain))
             },
             None => None,
         }
@@ -1362,7 +1362,7 @@ impl<'c> Cookie<'c> {
     pub fn domain_raw(&self) -> Option<&'c str> {
         match (self.domain.as_ref(), self.cookie_string.as_ref()) {
             (Some(domain), Some(string)) => match domain.to_raw_str(string) {
-                Some(s) => s.strip_prefix(".").or(Some(s)),
+                Some(s) => s.strip_prefix('.').or(Some(s)),
                 None => None,
             }
             _ => None,
diff --git a/src/parse.rs b/src/parse.rs
index b263d915..4a1913a0 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -153,7 +153,7 @@ fn parse_inner<'c>(s: &str, decode: bool) -> Result<Cookie<'c>, ParseError> {
                     v = &v[1..];
                 }
 
-                if !v.chars().all(|d| d.is_digit(10)) {
+                if !v.chars().all(|d| d.is_ascii_digit()) {
                     continue
                 }