diff --git a/crates/ruma-client-api/CHANGELOG.md b/crates/ruma-client-api/CHANGELOG.md
index 3dc851b5..3a15d417 100644
--- a/crates/ruma-client-api/CHANGELOG.md
+++ b/crates/ruma-client-api/CHANGELOG.md
@@ -27,6 +27,9 @@ Improvements:
   to send `Future` events and update `Future` events with `future_tokens`.
   (`Future` events are scheduled messages that can be controlled
   with `future_tokens` to send on demand or restart the timeout)
+- Change types of `SyncRequestListFilters::{room_types,not_room_types}` to
+  `Vec<Option<RoomType>>` instead of a vector of strings
+  - This is a breaking change, but only for users of `unstable-msc3575`
 
 Bug fixes:
 
diff --git a/crates/ruma-client-api/src/sync/sync_events/v4.rs b/crates/ruma-client-api/src/sync/sync_events/v4.rs
index 2a6a56c6..3d88be78 100644
--- a/crates/ruma-client-api/src/sync/sync_events/v4.rs
+++ b/crates/ruma-client-api/src/sync/sync_events/v4.rs
@@ -11,6 +11,7 @@ use js_option::JsOption;
 use ruma_common::{
     api::{request, response, Metadata},
     metadata,
+    room::RoomType,
     serde::{deserialize_cow_str, duration::opt_ms, Raw},
     DeviceKeyAlgorithm, MilliSecondsSinceUnixEpoch, OwnedMxcUri, OwnedRoomId, OwnedUserId, RoomId,
 };
@@ -230,14 +231,14 @@ pub struct SyncRequestListFilters {
     /// returned regardless of type. This can be used to get the initial set of spaces for an
     /// account.
     #[serde(default, skip_serializing_if = "Vec::is_empty")]
-    pub room_types: Vec<String>,
+    pub room_types: Vec<Option<RoomType>>,
 
     /// Only list rooms that are not of these create-types, or all.
     ///
     /// Same as "room_types" but inverted. This can be used to filter out spaces from the room
     /// list.
     #[serde(default, skip_serializing_if = "<[_]>::is_empty")]
-    pub not_room_types: Vec<String>,
+    pub not_room_types: Vec<Option<RoomType>>,
 
     /// Only list rooms matching the given string, or all.
     ///