diff --git a/crates/ruma-events/src/room_key_request.rs b/crates/ruma-events/src/room_key_request.rs
index 241a73ee..ddf57dec 100644
--- a/crates/ruma-events/src/room_key_request.rs
+++ b/crates/ruma-events/src/room_key_request.rs
@@ -3,7 +3,7 @@
 //! [`m.room_key_request`]: https://spec.matrix.org/v1.1/client-server-api/#mroom_key_request
 
 use ruma_events_macros::EventContent;
-use ruma_identifiers::{DeviceId, EventEncryptionAlgorithm, RoomId};
+use ruma_identifiers::{DeviceId, EventEncryptionAlgorithm, RoomId, TransactionId};
 use ruma_serde::StringEnum;
 use serde::{Deserialize, Serialize};
 
@@ -29,7 +29,7 @@ pub struct ToDeviceRoomKeyRequestEventContent {
     ///
     /// If the key is requested multiple times, it should be reused. It should also reused
     /// in order to cancel a request.
-    pub request_id: String,
+    pub request_id: Box<TransactionId>,
 }
 
 impl ToDeviceRoomKeyRequestEventContent {
@@ -39,7 +39,7 @@ impl ToDeviceRoomKeyRequestEventContent {
         action: Action,
         body: Option<RequestedKeyInfo>,
         requesting_device_id: Box<DeviceId>,
-        request_id: String,
+        request_id: Box<TransactionId>,
     ) -> Self {
         Self { action, body, requesting_device_id, request_id }
     }
diff --git a/crates/ruma-events/src/secret/request.rs b/crates/ruma-events/src/secret/request.rs
index 96854dfa..56fbd288 100644
--- a/crates/ruma-events/src/secret/request.rs
+++ b/crates/ruma-events/src/secret/request.rs
@@ -5,7 +5,7 @@
 use std::convert::TryFrom;
 
 use ruma_events_macros::EventContent;
-use ruma_identifiers::DeviceId;
+use ruma_identifiers::{DeviceId, TransactionId};
 use ruma_serde::StringEnum;
 use serde::{ser::SerializeStruct, Deserialize, Serialize};
 
@@ -32,7 +32,7 @@ pub struct ToDeviceSecretRequestEventContent {
     ///
     /// If the secret is requested from multiple devices at the same time, the same ID may be used
     /// for every target. The same ID is also used in order to cancel a previous request.
-    pub request_id: String,
+    pub request_id: Box<TransactionId>,
 }
 
 impl ToDeviceSecretRequestEventContent {
@@ -41,7 +41,7 @@ impl ToDeviceSecretRequestEventContent {
     pub fn new(
         action: RequestAction,
         requesting_device_id: Box<DeviceId>,
-        request_id: String,
+        request_id: Box<TransactionId>,
     ) -> Self {
         Self { action, requesting_device_id, request_id }
     }
diff --git a/crates/ruma-events/src/secret/send.rs b/crates/ruma-events/src/secret/send.rs
index 3a26ebbb..ef57a1c7 100644
--- a/crates/ruma-events/src/secret/send.rs
+++ b/crates/ruma-events/src/secret/send.rs
@@ -16,7 +16,7 @@ use serde::{Deserialize, Serialize};
 #[ruma_event(type = "m.secret.send", kind = ToDevice)]
 pub struct ToDeviceSecretSendEventContent {
     /// The ID of the request that this is a response to.
-    pub request_id: String,
+    pub request_id: Box<TransactionId>,
 
     /// The contents of the secret.
     pub secret: String,
@@ -24,7 +24,7 @@ pub struct ToDeviceSecretSendEventContent {
 
 impl ToDeviceSecretSendEventContent {
     /// Creates a new `SecretSendEventContent` with the given request ID and secret.
-    pub fn new(request_id: String, secret: String) -> Self {
+    pub fn new(request_id: Box<TransactionId>, secret: String) -> Self {
         Self { request_id, secret }
     }
 }