diff --git a/openpgp-card-sequoia/src/util.rs b/openpgp-card-sequoia/src/util.rs
index 6422057..5583187 100644
--- a/openpgp-card-sequoia/src/util.rs
+++ b/openpgp-card-sequoia/src/util.rs
@@ -37,8 +37,8 @@ use crate::{Card, PublicKey};
 ///
 /// FIXME: accept optional metadata for user_id(s)?
 #[allow(clippy::too_many_arguments)]
-pub fn make_cert<'app>(
-    open: &mut Card<Transaction<'app>>,
+pub fn make_cert(
+    open: &mut Card<Transaction<'_>>,
     key_sig: PublicKey,
     key_dec: Option<PublicKey>,
     key_aut: Option<PublicKey>,
diff --git a/openpgp-card/src/lib.rs b/openpgp-card/src/lib.rs
index 4119254..a89a12a 100644
--- a/openpgp-card/src/lib.rs
+++ b/openpgp-card/src/lib.rs
@@ -39,7 +39,6 @@ mod openpgp;
 mod tlv;
 
 use std::convert::TryInto;
-use std::ops::{Deref, DerefMut};
 
 use crate::apdu::commands;
 use crate::card_do::ApplicationRelatedData;
@@ -186,19 +185,6 @@ pub trait CardTransaction {
     }
 }
 
-impl<'a> Deref for dyn CardTransaction + Send + Sync + 'a {
-    type Target = dyn CardTransaction + 'a;
-
-    fn deref(&self) -> &Self::Target {
-        self
-    }
-}
-impl<'a> DerefMut for dyn CardTransaction + Send + Sync + 'a {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        self
-    }
-}
-
 /// Information about the capabilities of a card.
 ///
 /// CardCaps is used to signal capabilities (chaining, extended length support, max