diff --git a/Cargo.toml b/Cargo.toml
index 4df15c91c..330c14011 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -79,7 +79,7 @@ ruma = { git = "https://github.com/ruma/ruma", rev = "b4941a991919685345646a230b
 ruma-common = { git = "https://github.com/ruma/ruma", rev = "b4941a991919685345646a230b05b985338ec3f8" }
 sentry = "0.36.0"
 sentry-tracing = "0.36.0"
-serde = "1.0.217"
+serde = { version = "1.0.217", features = ["rc"] }
 serde_html_form = "0.2.7"
 serde_json = "1.0.138"
 sha2 = "0.10.8"
diff --git a/crates/matrix-sdk-base/src/event_cache/store/integration_tests.rs b/crates/matrix-sdk-base/src/event_cache/store/integration_tests.rs
index 42fd9658a..b30837c68 100644
--- a/crates/matrix-sdk-base/src/event_cache/store/integration_tests.rs
+++ b/crates/matrix-sdk-base/src/event_cache/store/integration_tests.rs
@@ -14,6 +14,8 @@
 
 //! Trait and macro of integration tests for `EventCacheStore` implementations.
 
+use std::sync::Arc;
+
 use assert_matches::assert_matches;
 use matrix_sdk_common::{
     deserialized_responses::{
@@ -55,7 +57,7 @@ pub fn make_test_event_with_event_id(
     content: &str,
     event_id: Option<&EventId>,
 ) -> TimelineEvent {
-    let encryption_info = EncryptionInfo {
+    let encryption_info = Arc::new(EncryptionInfo {
         sender: (*ALICE).into(),
         sender_device: None,
         algorithm_info: AlgorithmInfo::MegolmV1AesSha2 {
@@ -64,7 +66,7 @@ pub fn make_test_event_with_event_id(
             session_id: Some("mysessionid9".to_owned()),
         },
         verification_state: VerificationState::Verified,
-    };
+    });
 
     let mut builder = EventFactory::new().text_msg(content).room(room_id).sender(*ALICE);
     if let Some(event_id) = event_id {
diff --git a/crates/matrix-sdk-common/src/deserialized_responses.rs b/crates/matrix-sdk-common/src/deserialized_responses.rs
index 0fe4d5d5e..3ad74f868 100644
--- a/crates/matrix-sdk-common/src/deserialized_responses.rs
+++ b/crates/matrix-sdk-common/src/deserialized_responses.rs
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use std::{collections::BTreeMap, fmt};
+use std::{collections::BTreeMap, fmt, sync::Arc};
 
 #[cfg(doc)]
 use ruma::events::AnyTimelineEvent;
@@ -462,7 +462,7 @@ impl TimelineEvent {
 
     /// If the event was a decrypted event that was successfully decrypted, get
     /// its encryption info. Otherwise, `None`.
-    pub fn encryption_info(&self) -> Option<&EncryptionInfo> {
+    pub fn encryption_info(&self) -> Option<&Arc<EncryptionInfo>> {
         self.kind.encryption_info()
     }
 
@@ -569,7 +569,7 @@ impl TimelineEventKind {
 
     /// If the event was a decrypted event that was successfully decrypted, get
     /// its encryption info. Otherwise, `None`.
-    pub fn encryption_info(&self) -> Option<&EncryptionInfo> {
+    pub fn encryption_info(&self) -> Option<&Arc<EncryptionInfo>> {
         match self {
             TimelineEventKind::Decrypted(d) => Some(&d.encryption_info),
             TimelineEventKind::UnableToDecrypt { .. } | TimelineEventKind::PlainText { .. } => None,
@@ -649,7 +649,7 @@ pub struct DecryptedRoomEvent {
     pub event: Raw<AnyMessageLikeEvent>,
 
     /// The encryption info about the event.
-    pub encryption_info: EncryptionInfo,
+    pub encryption_info: Arc<EncryptionInfo>,
 
     /// The encryption info about the events bundled in the `unsigned`
     /// object.
@@ -706,7 +706,7 @@ impl UnsignedEventLocation {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum UnsignedDecryptionResult {
     /// The event was successfully decrypted.
-    Decrypted(EncryptionInfo),
+    Decrypted(Arc<EncryptionInfo>),
     /// The event failed to be decrypted.
     UnableToDecrypt(UnableToDecryptInfo),
 }
@@ -714,7 +714,7 @@ pub enum UnsignedDecryptionResult {
 impl UnsignedDecryptionResult {
     /// Returns the encryption info for this bundled event if it was
     /// successfully decrypted.
-    pub fn encryption_info(&self) -> Option<&EncryptionInfo> {
+    pub fn encryption_info(&self) -> Option<&Arc<EncryptionInfo>> {
         match self {
             Self::Decrypted(info) => Some(info),
             Self::UnableToDecrypt(_) => None,
@@ -918,9 +918,10 @@ struct SyncTimelineEventDeserializationHelperV0 {
     /// The actual event.
     event: Raw<AnySyncTimelineEvent>,
 
-    /// The encryption info about the event. Will be `None` if the event
-    /// was not encrypted.
-    encryption_info: Option<EncryptionInfo>,
+    /// The encryption info about the event.
+    ///
+    /// Will be `None` if the event was not encrypted.
+    encryption_info: Option<Arc<EncryptionInfo>>,
 
     /// The push actions associated with this event.
     #[serde(default)]
@@ -966,7 +967,7 @@ impl From<SyncTimelineEventDeserializationHelperV0> for TimelineEvent {
 
 #[cfg(test)]
 mod tests {
-    use std::collections::BTreeMap;
+    use std::{collections::BTreeMap, sync::Arc};
 
     use assert_matches::assert_matches;
     use insta::{assert_json_snapshot, with_settings};
@@ -1118,7 +1119,7 @@ mod tests {
         let room_event = TimelineEvent {
             kind: TimelineEventKind::Decrypted(DecryptedRoomEvent {
                 event: Raw::new(&example_event()).unwrap().cast(),
-                encryption_info: EncryptionInfo {
+                encryption_info: Arc::new(EncryptionInfo {
                     sender: user_id!("@sender:example.com").to_owned(),
                     sender_device: None,
                     algorithm_info: AlgorithmInfo::MegolmV1AesSha2 {
@@ -1127,7 +1128,7 @@ mod tests {
                         session_id: Some("xyz".to_owned()),
                     },
                     verification_state: VerificationState::Verified,
-                },
+                }),
                 unsigned_encryption_info: Some(BTreeMap::from([(
                     UnsignedEventLocation::RelationsReplace,
                     UnsignedDecryptionResult::UnableToDecrypt(UnableToDecryptInfo {
@@ -1490,7 +1491,7 @@ mod tests {
         let room_event = TimelineEvent {
             kind: TimelineEventKind::Decrypted(DecryptedRoomEvent {
                 event: Raw::new(&example_event()).unwrap().cast(),
-                encryption_info: EncryptionInfo {
+                encryption_info: Arc::new(EncryptionInfo {
                     sender: user_id!("@sender:example.com").to_owned(),
                     sender_device: Some(device_id!("ABCDEFGHIJ").to_owned()),
                     algorithm_info: AlgorithmInfo::MegolmV1AesSha2 {
@@ -1508,7 +1509,7 @@ mod tests {
                         session_id: Some("mysessionid112".to_owned()),
                     },
                     verification_state: VerificationState::Verified,
-                },
+                }),
                 unsigned_encryption_info: Some(BTreeMap::from([(
                     UnsignedEventLocation::RelationsThreadLatestEvent,
                     UnsignedDecryptionResult::UnableToDecrypt(UnableToDecryptInfo {
diff --git a/crates/matrix-sdk-crypto/src/machine/mod.rs b/crates/matrix-sdk-crypto/src/machine/mod.rs
index 6802c3c34..aade09f2b 100644
--- a/crates/matrix-sdk-crypto/src/machine/mod.rs
+++ b/crates/matrix-sdk-crypto/src/machine/mod.rs
@@ -1760,13 +1760,13 @@ impl OlmMachine {
         &self,
         session: &InboundGroupSession,
         sender: &UserId,
-    ) -> MegolmResult<EncryptionInfo> {
+    ) -> MegolmResult<Arc<EncryptionInfo>> {
         let (verification_state, device_id) =
             self.get_or_update_verification_state(session, sender).await?;
 
         let sender = sender.to_owned();
 
-        Ok(EncryptionInfo {
+        Ok(Arc::new(EncryptionInfo {
             sender,
             sender_device: device_id,
             algorithm_info: AlgorithmInfo::MegolmV1AesSha2 {
@@ -1779,7 +1779,7 @@ impl OlmMachine {
                 session_id: Some(session.session_id().to_owned()),
             },
             verification_state,
-        })
+        }))
     }
 
     async fn decrypt_megolm_events(
@@ -1788,7 +1788,7 @@ impl OlmMachine {
         event: &EncryptedEvent,
         content: &SupportedEventEncryptionSchemes<'_>,
         decryption_settings: &DecryptionSettings,
-    ) -> MegolmResult<(JsonObject, EncryptionInfo)> {
+    ) -> MegolmResult<(JsonObject, Arc<EncryptionInfo>)> {
         let session =
             self.get_inbound_group_session_or_error(room_id, content.session_id()).await?;
 
@@ -2200,7 +2200,7 @@ impl OlmMachine {
         &self,
         event: &Raw<EncryptedEvent>,
         room_id: &RoomId,
-    ) -> MegolmResult<EncryptionInfo> {
+    ) -> MegolmResult<Arc<EncryptionInfo>> {
         let event = event.deserialize()?;
 
         let content: SupportedEventEncryptionSchemes<'_> = match &event.content.scheme {
@@ -2233,7 +2233,7 @@ impl OlmMachine {
         room_id: &RoomId,
         session_id: &str,
         sender: &UserId,
-    ) -> MegolmResult<EncryptionInfo> {
+    ) -> MegolmResult<Arc<EncryptionInfo>> {
         let session = self.get_inbound_group_session_or_error(room_id, session_id).await?;
         self.get_encryption_info(&session, sender).await
     }
diff --git a/crates/matrix-sdk-crypto/src/machine/tests/mod.rs b/crates/matrix-sdk-crypto/src/machine/tests/mod.rs
index dc4b60bca..f88d30237 100644
--- a/crates/matrix-sdk-crypto/src/machine/tests/mod.rs
+++ b/crates/matrix-sdk-crypto/src/machine/tests/mod.rs
@@ -443,12 +443,12 @@ async fn test_session_encryption_info_can_be_fetched() {
 
     // Then the expected info is returned
     assert_eq!(encryption_info.sender, alice_id());
-    assert_eq!(encryption_info.sender_device.unwrap(), alice_device_id());
+    assert_eq!(encryption_info.sender_device.as_deref(), Some(alice_device_id()));
     assert_matches!(
-        encryption_info.algorithm_info,
+        &encryption_info.algorithm_info,
         AlgorithmInfo::MegolmV1AesSha2 { curve25519_key, .. }
     );
-    assert_eq!(curve25519_key, alice_session.sender_key().to_string());
+    assert_eq!(*curve25519_key, alice_session.sender_key().to_string());
     assert_eq!(
         encryption_info.verification_state,
         VerificationState::Unverified(VerificationLevel::UnsignedDevice)
diff --git a/crates/matrix-sdk-ui/src/timeline/controller/aggregations.rs b/crates/matrix-sdk-ui/src/timeline/controller/aggregations.rs
index 3534ec38c..751800dcf 100644
--- a/crates/matrix-sdk-ui/src/timeline/controller/aggregations.rs
+++ b/crates/matrix-sdk-ui/src/timeline/controller/aggregations.rs
@@ -37,7 +37,7 @@
 //! to cater for the first use case, and to never lose any aggregations in the
 //! second use case.
 
-use std::{borrow::Cow, collections::HashMap};
+use std::{borrow::Cow, collections::HashMap, sync::Arc};
 
 use as_variant::as_variant;
 use matrix_sdk::deserialized_responses::EncryptionInfo;
@@ -82,7 +82,7 @@ pub(in crate::timeline) struct PendingEdit {
     pub edit_json: Option<Raw<AnySyncTimelineEvent>>,
 
     /// The encryption info for this edit.
-    pub encryption_info: Option<EncryptionInfo>,
+    pub encryption_info: Option<Arc<EncryptionInfo>>,
 }
 
 /// Which kind of aggregation (related event) is this?
diff --git a/crates/matrix-sdk-ui/src/timeline/controller/decryption_retry_task.rs b/crates/matrix-sdk-ui/src/timeline/controller/decryption_retry_task.rs
index b82972ab3..cc5168e2c 100644
--- a/crates/matrix-sdk-ui/src/timeline/controller/decryption_retry_task.rs
+++ b/crates/matrix-sdk-ui/src/timeline/controller/decryption_retry_task.rs
@@ -506,7 +506,7 @@ mod tests {
             read_receipts: Default::default(),
             is_own: false,
             is_highlighted: false,
-            encryption_info: Some(EncryptionInfo {
+            encryption_info: Some(Arc::new(EncryptionInfo {
                 sender: owned_user_id!("@u:s.co"),
                 sender_device: None,
                 algorithm_info: AlgorithmInfo::MegolmV1AesSha2 {
@@ -515,7 +515,7 @@ mod tests {
                     session_id: Some(session_id.to_owned()),
                 },
                 verification_state: VerificationState::Verified,
-            }),
+            })),
             original_json: None,
             latest_edit_json: None,
             origin: RemoteEventOrigin::Sync,
diff --git a/crates/matrix-sdk-ui/src/timeline/event_handler.rs b/crates/matrix-sdk-ui/src/timeline/event_handler.rs
index f19f35623..b98defa24 100644
--- a/crates/matrix-sdk-ui/src/timeline/event_handler.rs
+++ b/crates/matrix-sdk-ui/src/timeline/event_handler.rs
@@ -85,7 +85,7 @@ pub(super) enum Flow {
         /// Where should this be added in the timeline.
         position: TimelineItemPosition,
         /// Information about the encryption for this event.
-        encryption_info: Option<EncryptionInfo>,
+        encryption_info: Option<Arc<EncryptionInfo>>,
     },
 }
 
@@ -150,7 +150,7 @@ pub(super) struct RemoteEventContext<'a> {
     event_id: &'a EventId,
     raw_event: &'a Raw<AnySyncTimelineEvent>,
     relations: BundledMessageLikeRelations<AnySyncMessageLikeEvent>,
-    bundled_edit_encryption_info: Option<EncryptionInfo>,
+    bundled_edit_encryption_info: Option<Arc<EncryptionInfo>>,
 }
 
 /// An action that we want to cause on the timeline.
@@ -195,7 +195,7 @@ impl TimelineAction {
         raw_event: &Raw<AnySyncTimelineEvent>,
         room_data_provider: &P,
         unable_to_decrypt_info: Option<UnableToDecryptInfo>,
-        bundled_edit_encryption_info: Option<EncryptionInfo>,
+        bundled_edit_encryption_info: Option<Arc<EncryptionInfo>>,
         timeline_items: &Vector<Arc<TimelineItem>>,
         meta: &mut TimelineMetadata,
     ) -> Option<Self> {
diff --git a/crates/matrix-sdk-ui/src/timeline/event_item/mod.rs b/crates/matrix-sdk-ui/src/timeline/event_item/mod.rs
index 465994712..c742cb4f1 100644
--- a/crates/matrix-sdk-ui/src/timeline/event_item/mod.rs
+++ b/crates/matrix-sdk-ui/src/timeline/event_item/mod.rs
@@ -398,7 +398,7 @@ impl EventTimelineItem {
     pub fn encryption_info(&self) -> Option<&EncryptionInfo> {
         match &self.kind {
             EventTimelineItemKind::Local(_) => None,
-            EventTimelineItemKind::Remote(remote_event) => remote_event.encryption_info.as_ref(),
+            EventTimelineItemKind::Remote(remote_event) => remote_event.encryption_info.as_deref(),
         }
     }
 
@@ -521,7 +521,10 @@ impl EventTimelineItem {
     }
 
     /// Clone the current event item, and update its `encryption_info`.
-    pub(super) fn with_encryption_info(&self, encryption_info: Option<EncryptionInfo>) -> Self {
+    pub(super) fn with_encryption_info(
+        &self,
+        encryption_info: Option<Arc<EncryptionInfo>>,
+    ) -> Self {
         let mut new = self.clone();
         if let EventTimelineItemKind::Remote(r) = &mut new.kind {
             r.encryption_info = encryption_info;
diff --git a/crates/matrix-sdk-ui/src/timeline/event_item/remote.rs b/crates/matrix-sdk-ui/src/timeline/event_item/remote.rs
index 8e0d6a684..e6a8d0600 100644
--- a/crates/matrix-sdk-ui/src/timeline/event_item/remote.rs
+++ b/crates/matrix-sdk-ui/src/timeline/event_item/remote.rs
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use std::fmt;
+use std::{fmt, sync::Arc};
 
 use indexmap::IndexMap;
 use matrix_sdk::deserialized_responses::EncryptionInfo;
@@ -46,7 +46,7 @@ pub(in crate::timeline) struct RemoteEventTimelineItem {
     pub is_highlighted: bool,
 
     /// Encryption information.
-    pub encryption_info: Option<EncryptionInfo>,
+    pub encryption_info: Option<Arc<EncryptionInfo>>,
 
     /// JSON of the original event.
     ///
diff --git a/crates/matrix-sdk-ui/src/timeline/tests/edit.rs b/crates/matrix-sdk-ui/src/timeline/tests/edit.rs
index 90b44ff6d..cc716eada 100644
--- a/crates/matrix-sdk-ui/src/timeline/tests/edit.rs
+++ b/crates/matrix-sdk-ui/src/timeline/tests/edit.rs
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use std::collections::BTreeMap;
+use std::{collections::BTreeMap, sync::Arc};
 
 use assert_matches2::assert_let;
 use eyeball_im::VectorDiff;
@@ -167,7 +167,7 @@ async fn test_edit_updates_encryption_info() {
         .room(room_id)
         .into_raw_timeline();
 
-    let mut encryption_info = EncryptionInfo {
+    let mut encryption_info = Arc::new(EncryptionInfo {
         sender: (*ALICE).into(),
         sender_device: None,
         algorithm_info: AlgorithmInfo::MegolmV1AesSha2 {
@@ -176,7 +176,7 @@ async fn test_edit_updates_encryption_info() {
             session_id: Some("mysessionid6333".to_owned()),
         },
         verification_state: VerificationState::Verified,
-    };
+    });
 
     let original_event: TimelineEvent = DecryptedRoomEvent {
         event: original_event.cast(),
@@ -205,7 +205,7 @@ async fn test_edit_updates_encryption_info() {
         .room(room_id)
         .edit(original_event_id, MessageType::text_plain("!!edited!! **better** message").into())
         .into_raw_timeline();
-    encryption_info.verification_state =
+    Arc::make_mut(&mut encryption_info).verification_state =
         VerificationState::Unverified(VerificationLevel::UnverifiedIdentity);
     let edit_event: TimelineEvent = DecryptedRoomEvent {
         event: edit_event.cast(),
diff --git a/crates/matrix-sdk-ui/src/timeline/tests/encryption.rs b/crates/matrix-sdk-ui/src/timeline/tests/encryption.rs
index 881ae785d..0e712afb7 100644
--- a/crates/matrix-sdk-ui/src/timeline/tests/encryption.rs
+++ b/crates/matrix-sdk-ui/src/timeline/tests/encryption.rs
@@ -690,8 +690,11 @@ async fn test_retry_fetching_encryption_info() {
     assert_pending!(stream);
 }
 
-fn make_encryption_info(session_id: &str, verification_state: VerificationState) -> EncryptionInfo {
-    EncryptionInfo {
+fn make_encryption_info(
+    session_id: &str,
+    verification_state: VerificationState,
+) -> Arc<EncryptionInfo> {
+    Arc::new(EncryptionInfo {
         sender: BOB.to_owned(),
         sender_device: Some(owned_device_id!("BOBDEVICE")),
         algorithm_info: AlgorithmInfo::MegolmV1AesSha2 {
@@ -700,7 +703,7 @@ fn make_encryption_info(session_id: &str, verification_state: VerificationState)
             session_id: Some(session_id.to_owned()),
         },
         verification_state,
-    }
+    })
 }
 
 #[async_test]
diff --git a/crates/matrix-sdk-ui/src/timeline/tests/mod.rs b/crates/matrix-sdk-ui/src/timeline/tests/mod.rs
index 8b6440101..08d9b2dff 100644
--- a/crates/matrix-sdk-ui/src/timeline/tests/mod.rs
+++ b/crates/matrix-sdk-ui/src/timeline/tests/mod.rs
@@ -264,7 +264,7 @@ struct TestRoomDataProvider {
 
     /// The [`EncryptionInfo`] describing the Megolm sessions that were used to
     /// encrypt events.
-    pub encryption_info: HashMap<String, EncryptionInfo>,
+    pub encryption_info: HashMap<String, Arc<EncryptionInfo>>,
 }
 
 impl TestRoomDataProvider {
@@ -272,6 +272,7 @@ impl TestRoomDataProvider {
         self.initial_user_receipts = initial_user_receipts;
         self
     }
+
     fn with_fully_read_marker(mut self, event_id: OwnedEventId) -> Self {
         self.fully_read_marker = Some(event_id);
         self
@@ -280,7 +281,7 @@ impl TestRoomDataProvider {
     fn with_encryption_info(
         mut self,
         session_id: &str,
-        encryption_info: EncryptionInfo,
+        encryption_info: Arc<EncryptionInfo>,
     ) -> TestRoomDataProvider {
         self.encryption_info.insert(session_id.to_owned(), encryption_info);
         self
@@ -425,7 +426,7 @@ impl RoomDataProvider for TestRoomDataProvider {
         &self,
         session_id: &str,
         _sender: &UserId,
-    ) -> Option<EncryptionInfo> {
+    ) -> Option<Arc<EncryptionInfo>> {
         self.encryption_info.get(session_id).cloned()
     }
 
diff --git a/crates/matrix-sdk-ui/src/timeline/traits.rs b/crates/matrix-sdk-ui/src/timeline/traits.rs
index bd985d7d3..11fc3bc2b 100644
--- a/crates/matrix-sdk-ui/src/timeline/traits.rs
+++ b/crates/matrix-sdk-ui/src/timeline/traits.rs
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use std::future::Future;
+use std::{future::Future, sync::Arc};
 
 use eyeball::Subscriber;
 use indexmap::IndexMap;
@@ -142,7 +142,7 @@ pub(super) trait RoomDataProvider:
         &self,
         session_id: &str,
         sender: &UserId,
-    ) -> impl Future<Output = Option<EncryptionInfo>> + SendOutsideWasm;
+    ) -> impl Future<Output = Option<Arc<EncryptionInfo>>> + SendOutsideWasm;
 
     async fn relations(&self, event_id: OwnedEventId, opts: RelationsOptions) -> Result<Relations>;
 }
@@ -286,7 +286,7 @@ impl RoomDataProvider for Room {
         &self,
         session_id: &str,
         sender: &UserId,
-    ) -> Option<EncryptionInfo> {
+    ) -> Option<Arc<EncryptionInfo>> {
         // Pass directly on to `Room::get_encryption_info`
         self.get_encryption_info(session_id, sender).await
     }
diff --git a/crates/matrix-sdk/src/event_handler/mod.rs b/crates/matrix-sdk/src/event_handler/mod.rs
index 22dfe5f6e..b50ae5a53 100644
--- a/crates/matrix-sdk/src/event_handler/mod.rs
+++ b/crates/matrix-sdk/src/event_handler/mod.rs
@@ -401,7 +401,7 @@ impl Client {
             };
 
             let raw_event = item.raw().json();
-            let encryption_info = item.encryption_info();
+            let encryption_info = item.encryption_info().map(|i| &**i);
             let push_actions = item.push_actions.as_deref().unwrap_or(&[]);
 
             // Event handlers for possibly-redacted timeline events
diff --git a/crates/matrix-sdk/src/room/mod.rs b/crates/matrix-sdk/src/room/mod.rs
index 6dac8d4b5..368190dbe 100644
--- a/crates/matrix-sdk/src/room/mod.rs
+++ b/crates/matrix-sdk/src/room/mod.rs
@@ -1523,7 +1523,7 @@ impl Room {
         &self,
         session_id: &str,
         sender: &UserId,
-    ) -> Option<EncryptionInfo> {
+    ) -> Option<Arc<EncryptionInfo>> {
         let machine = self.client.olm_machine().await;
         let machine = machine.as_ref()?;
         machine.get_session_encryption_info(self.room_id(), session_id, sender).await.ok()