diff --git a/src/api/client/mutual_rooms.rs b/src/api/client/mutual_rooms.rs
index e2e2216dd..ff5fcedb2 100644
--- a/src/api/client/mutual_rooms.rs
+++ b/src/api/client/mutual_rooms.rs
@@ -21,10 +21,6 @@ pub(crate) async fn get_mutual_rooms_route(
 		return Err!(Request(Unknown("You cannot request rooms in common with yourself.")));
 	}
 
-	if !services.users.exists(&body.user_id).await {
-		return Ok(mutual_rooms::unstable::Response::new(vec![]));
-	}
-
 	let mutual_rooms = services
 		.rooms
 		.state_cache
diff --git a/src/api/client/unversioned.rs b/src/api/client/unversioned.rs
index 8ab930396..ff4fd55dd 100644
--- a/src/api/client/unversioned.rs
+++ b/src/api/client/unversioned.rs
@@ -1,7 +1,8 @@
-use std::collections::BTreeMap;
-
 use axum::{Json, extract::State, response::IntoResponse};
-use conduwuit::Result;
+use conduwuit::{
+	Result,
+	matrix::versions::{unstable_features, versions},
+};
 use futures::StreamExt;
 use ruma::{api::client::discovery::get_supported_versions, assign};
 
@@ -22,47 +23,10 @@
 pub(crate) async fn get_supported_versions_route(
 	_body: Ruma<get_supported_versions::Request>,
 ) -> Result<get_supported_versions::Response> {
-	let versions = vec![
-		"r0.0.1".to_owned(),
-		"r0.1.0".to_owned(),
-		"r0.2.0".to_owned(),
-		"r0.3.0".to_owned(),
-		"r0.4.0".to_owned(),
-		"r0.5.0".to_owned(),
-		"r0.6.0".to_owned(),
-		"r0.6.1".to_owned(),
-		"v1.1".to_owned(),
-		"v1.2".to_owned(),
-		"v1.3".to_owned(),
-		"v1.4".to_owned(),
-		"v1.5".to_owned(),
-		"v1.8".to_owned(),
-		"v1.11".to_owned(),
-		"v1.12".to_owned(),
-		"v1.13".to_owned(),
-		"v1.14".to_owned(),
-	];
-
-	let unstable_features = BTreeMap::from_iter([
-		("org.matrix.e2e_cross_signing".to_owned(), true),
-		("org.matrix.msc2285.stable".to_owned(), true), /* private read receipts (https://github.com/matrix-org/matrix-spec-proposals/pull/2285) */
-		("uk.half-shot.msc2666.query_mutual_rooms.stable".to_owned(), true), /* query mutual rooms (https://github.com/matrix-org/matrix-spec-proposals/pull/2666) */
-		("org.matrix.msc2836".to_owned(), true), /* threading/threads (https://github.com/matrix-org/matrix-spec-proposals/pull/2836) */
-		("org.matrix.msc2946".to_owned(), true), /* spaces/hierarchy summaries (https://github.com/matrix-org/matrix-spec-proposals/pull/2946) */
-		("org.matrix.msc3026.busy_presence".to_owned(), true), /* busy presence status (https://github.com/matrix-org/matrix-spec-proposals/pull/3026) */
-		("org.matrix.msc3814".to_owned(), true),               /* dehydrated devices */
-		("org.matrix.msc3827".to_owned(), true), /* filtering of /publicRooms by room type (https://github.com/matrix-org/matrix-spec-proposals/pull/3827) */
-		("org.matrix.msc3952_intentional_mentions".to_owned(), true), /* intentional mentions (https://github.com/matrix-org/matrix-spec-proposals/pull/3952) */
-		("org.matrix.msc3916.stable".to_owned(), true), /* authenticated media (https://github.com/matrix-org/matrix-spec-proposals/pull/3916) */
-		("org.matrix.msc4180".to_owned(), true), /* stable flag for 3916 (https://github.com/matrix-org/matrix-spec-proposals/pull/4180) */
-		("uk.tcpip.msc4133".to_owned(), true), /* Extending User Profile API with Key:Value Pairs (https://github.com/matrix-org/matrix-spec-proposals/pull/4133) */
-		("us.cloke.msc4175".to_owned(), true), /* Profile field for user time zone (https://github.com/matrix-org/matrix-spec-proposals/pull/4175) */
-		("org.matrix.simplified_msc3575".to_owned(), true), /* Simplified Sliding sync (https://github.com/matrix-org/matrix-spec-proposals/pull/4186) */
-		("uk.timedout.msc4323".to_owned(), true), /* agnostic suspend (https://github.com/matrix-org/matrix-spec-proposals/pull/4323) */
-		("org.matrix.msc4155".to_owned(), true), /* invite filtering (https://github.com/matrix-org/matrix-spec-proposals/pull/4155) */
-	]);
-
-	Ok(assign!(get_supported_versions::Response::new(versions), { unstable_features }))
+	Ok(assign!(
+		get_supported_versions::Response::new(versions()),
+		{ unstable_features: unstable_features() }
+	))
 }
 
 /// # `GET /_conduwuit/server_version`
diff --git a/src/core/matrix/versions.rs b/src/core/matrix/versions.rs
index 774f2509e..fa2284e7d 100644
--- a/src/core/matrix/versions.rs
+++ b/src/core/matrix/versions.rs
@@ -29,7 +29,7 @@ pub fn unstable_features() -> BTreeMap<String, bool> {
 	BTreeMap::from_iter([
 		("org.matrix.e2e_cross_signing".to_owned(), true),
 		("org.matrix.msc2285.stable".to_owned(), true), /* private read receipts (https://github.com/matrix-org/matrix-spec-proposals/pull/2285) */
-		("uk.half-shot.msc2666.query_mutual_rooms.stable".to_owned(), true), /* query mutual rooms (https://github.com/matrix-org/matrix-spec-proposals/pull/2666) */
+		("uk.half-shot.msc2666.query_mutual_rooms".to_owned(), true), /* query mutual rooms (https://github.com/matrix-org/matrix-spec-proposals/pull/2666) */
 		("org.matrix.msc2836".to_owned(), true), /* threading/threads (https://github.com/matrix-org/matrix-spec-proposals/pull/2836) */
 		("org.matrix.msc2946".to_owned(), true), /* spaces/hierarchy summaries (https://github.com/matrix-org/matrix-spec-proposals/pull/2946) */
 		("org.matrix.msc3026.busy_presence".to_owned(), true), /* busy presence status (https://github.com/matrix-org/matrix-spec-proposals/pull/3026) */