diff --git a/src/testhex.rs b/src/testhex.rs
index ec315e6..30d432e 100644
--- a/src/testhex.rs
+++ b/src/testhex.rs
@@ -35,7 +35,7 @@ impl<const SIZE: usize> TryFromBytes for [u8; SIZE] {
 
 struct HexVisitor;
 
-impl<'de> serde::de::Visitor<'de> for HexVisitor {
+impl serde::de::Visitor<'_> for HexVisitor {
     type Value = Vec<u8>;
 
     fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {