diff --git a/sim/Cargo.toml b/sim/Cargo.toml
index b5e23fe..dabac31 100644
--- a/sim/Cargo.toml
+++ b/sim/Cargo.toml
@@ -23,7 +23,7 @@ js-sys = "0.3"
 lazy_static = "1.4"
 num-traits = "0.2"
 rand_core = { version = "0.6", features = ["serde1"] }
-rand = { version = "0.8", features = ["serde1"] }
+rand = { version = "0.9", features = ["serde1"] }
 rand_distr = { version = "0.4" }
 rand_pcg = { version = "0.3", features = ["serde1"] }
 serde = { version = "1.0", features = ["derive"] }