diff --git a/sim/Cargo.toml b/sim/Cargo.toml
index b5e23fe..2b30d4d 100644
--- a/sim/Cargo.toml
+++ b/sim/Cargo.toml
@@ -28,7 +28,7 @@ rand_distr = { version = "0.4" }
 rand_pcg = { version = "0.3", features = ["serde1"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-serde_yaml = "0.8"
+serde_yaml = "0.9"
 sim_derive = { version = "0.13", path = "../sim_derive" }
 simx = { version = "0.13", path = "../simx", optional = true }
 thiserror = "1.0"