diff --git a/crates/matrix-sdk-appservice/Cargo.toml b/crates/matrix-sdk-appservice/Cargo.toml
index 23cafa95c..391808b01 100644
--- a/crates/matrix-sdk-appservice/Cargo.toml
+++ b/crates/matrix-sdk-appservice/Cargo.toml
@@ -37,7 +37,7 @@ regex = "1.5.5"
 ruma = { git = "https://github.com/ruma/ruma", rev = "ca8c66c885241a7ba3805399604eda4a38979f6b", features = ["client-api-c", "appservice-api-s"] }
 serde = "1.0.136"
 serde_json = "1.0.79"
-serde_yaml = "0.8.23"
+serde_yaml = "0.9.4"
 tokio = { version = "1.17.0", default-features = false, features = ["rt-multi-thread"] }
 thiserror = "1.0.30"
 tracing = "0.1.34"