diff --git a/matrix_sdk_crypto/Cargo.toml b/matrix_sdk_crypto/Cargo.toml
index e1ec78b2..8d38d331 100644
--- a/matrix_sdk_crypto/Cargo.toml
+++ b/matrix_sdk_crypto/Cargo.toml
@@ -26,7 +26,7 @@ matrix-sdk-common-macros = { version = "0.1.0", path = "../matrix_sdk_common_mac
 matrix-sdk-common = { version = "0.1.0", path = "../matrix_sdk_common" }
 
 olm-rs = { git = 'https://gitlab.gnome.org/jhaye/olm-rs/', features = ["serde"]}
-serde = { version = "1.0.115", features = ["derive"] }
+serde = { version = "1.0.115", features = ["derive", "rc"] }
 serde_json = "1.0.57"
 cjson = "0.1.1"
 zeroize = { version = "1.1.0", features = ["zeroize_derive"] }
diff --git a/matrix_sdk_crypto/src/device.rs b/matrix_sdk_crypto/src/device.rs
index bfbaface..687401aa 100644
--- a/matrix_sdk_crypto/src/device.rs
+++ b/matrix_sdk_crypto/src/device.rs
@@ -31,6 +31,7 @@ use matrix_sdk_common::{
     events::{room::encrypted::EncryptedEventContent, EventType},
     identifiers::{DeviceId, DeviceKeyAlgorithm, DeviceKeyId, EventEncryptionAlgorithm, UserId},
 };
+use serde::{Deserialize, Serialize};
 use serde_json::{json, Value};
 use tracing::warn;
 
@@ -230,7 +231,7 @@ impl UserDevices {
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq)]
+#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize)]
 /// The local trust state of a device.
 pub enum LocalTrust {
     /// The device has been verified and is trusted.