diff --git a/Cargo.toml b/Cargo.toml
index 214b9b984..530250644 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -601,6 +601,7 @@ version = "0.3.0"
 
 [workspace.dependencies.resolvematrix]
 version = "1.4.1"
+features = ["unstable-msc4188"]
 
 [workspace.dependencies.serde_urlencoded]
 version = "0.7.1"