diff --git a/openpgp-card/Cargo.toml b/openpgp-card/Cargo.toml
index d3b76dd..cb9d82b 100644
--- a/openpgp-card/Cargo.toml
+++ b/openpgp-card/Cargo.toml
@@ -12,6 +12,7 @@ repository = "https://gitlab.com/hkos/openpgp-card"
 documentation = "https://docs.rs/crate/openpgp-card"
 
 [dependencies]
+blanket = "0.2.0"
 nom = "6"
 hex-literal = "0.3"
 hex-slice = "0.1"
diff --git a/openpgp-card/src/lib.rs b/openpgp-card/src/lib.rs
index 81934f0..d893b2e 100644
--- a/openpgp-card/src/lib.rs
+++ b/openpgp-card/src/lib.rs
@@ -55,6 +55,7 @@ use crate::tlv::tag::Tag;
 use crate::tlv::value::Value;
 use crate::tlv::Tlv;
 
+#[blanket::blanket(derive(Box))]
 pub trait CardBackend {
     fn transaction(
         &mut self,
@@ -67,6 +68,7 @@ pub trait CardBackend {
 /// after opening a transaction from a CardBackend.
 ///
 /// CardTransaction exposes low-level access to OpenPGP card functionality.
+#[blanket::blanket(derive(Box))]
 pub trait CardTransaction {
     /// Transmit the command data in `cmd` to the card.
     ///