diff --git a/changelog.d/2175.bugfix b/changelog.d/2175.bugfix
new file mode 100644
index 000000000..0f4a762c2
--- /dev/null
+++ b/changelog.d/2175.bugfix
@@ -0,0 +1 @@
+Fixed simplified sliding sync omitting device list updates for rooms with only timeline changes. Contributed by @eleboucher.
diff --git a/src/api/client/sync/v5.rs b/src/api/client/sync/v5.rs
index 3752af589..8ad9c6cc9 100644
--- a/src/api/client/sync/v5.rs
+++ b/src/api/client/sync/v5.rs
@@ -1432,12 +1432,10 @@ async fn collect_e2ee<'a, Rooms>(
 			.await
 			.is_ok();
 
-		if let Some(since_shortstatehash) = since_shortstatehash {
-			// Skip if there are only timeline changes
-			if since_shortstatehash == current_shortstatehash {
-				continue;
-			}
-
+		// Skip the state diff only: `room_keys_changed` below must run for every room.
+		if let Some(since_shortstatehash) =
+			since_shortstatehash.filter(|since| *since != current_shortstatehash)
+		{
 			let since_encryption = services
 				.rooms
 				.state_accessor