diff --git a/sim/Cargo.toml b/sim/Cargo.toml
index b5e23fe..539cca6 100644
--- a/sim/Cargo.toml
+++ b/sim/Cargo.toml
@@ -22,7 +22,7 @@ getrandom = { version = "0.2", features = ["js"] }
 js-sys = "0.3"
 lazy_static = "1.4"
 num-traits = "0.2"
-rand_core = { version = "0.6", features = ["serde1"] }
+rand_core = { version = "0.9", features = ["serde1"] }
 rand = { version = "0.8", features = ["serde1"] }
 rand_distr = { version = "0.4" }
 rand_pcg = { version = "0.3", features = ["serde1"] }