diff --git a/src/st/map/iter.rs b/src/st/map/iter.rs
index bda7ef78d6f..de825cb545a 100644
--- a/src/st/map/iter.rs
+++ b/src/st/map/iter.rs
@@ -30,9 +30,9 @@ impl<'a, K, V> Iterator for Iter<'a, K, V> {
     }
 }
 
-impl<'a, K, V> FusedIterator for Iter<'a, K, V> {}
+impl<K, V> FusedIterator for Iter<'_, K, V> {}
 
-impl<'a, K, V> DoubleEndedIterator for Iter<'a, K, V> {
+impl<K, V> DoubleEndedIterator for Iter<'_, K, V> {
     fn next_back(&mut self) -> Option<Self::Item> {
         loop {
             match self.0.next_back() {
@@ -123,9 +123,9 @@ impl<'a, K, V> Iterator for Keys<'a, K, V> {
     }
 }
 
-impl<'a, K, V> FusedIterator for Keys<'a, K, V> {}
+impl<K, V> FusedIterator for Keys<'_, K, V> {}
 
-impl<'a, K, V> DoubleEndedIterator for Keys<'a, K, V> {
+impl<K, V> DoubleEndedIterator for Keys<'_, K, V> {
     fn next_back(&mut self) -> Option<Self::Item> {
         self.0.next_back().map(|(key, _)| key)
     }
@@ -174,9 +174,9 @@ impl<'a, K, V> Iterator for Values<'a, K, V> {
     }
 }
 
-impl<'a, K, V> FusedIterator for Values<'a, K, V> {}
+impl<K, V> FusedIterator for Values<'_, K, V> {}
 
-impl<'a, K, V> DoubleEndedIterator for Values<'a, K, V> {
+impl<K, V> DoubleEndedIterator for Values<'_, K, V> {
     fn next_back(&mut self) -> Option<Self::Item> {
         self.0.next_back().map(|(_, value)| value)
     }
diff --git a/src/st/set/iter.rs b/src/st/set/iter.rs
index 4f15888a197..5385a32dc73 100644
--- a/src/st/set/iter.rs
+++ b/src/st/set/iter.rs
@@ -42,11 +42,11 @@ impl<'a, T> Iterator for Iter<'a, T> {
     }
 }
 
-impl<'a, T> FusedIterator for Iter<'a, T> {}
+impl<T> FusedIterator for Iter<'_, T> {}
 
-impl<'a, T> ExactSizeIterator for Iter<'a, T> {}
+impl<T> ExactSizeIterator for Iter<'_, T> {}
 
-impl<'a, T> DoubleEndedIterator for Iter<'a, T> {
+impl<T> DoubleEndedIterator for Iter<'_, T> {
     fn next_back(&mut self) -> Option<Self::Item> {
         self.0.next_back()
     }