diff --git a/sim/Cargo.toml b/sim/Cargo.toml
index b5e23fe..e6df824 100644
--- a/sim/Cargo.toml
+++ b/sim/Cargo.toml
@@ -25,7 +25,7 @@ num-traits = "0.2"
 rand_core = { version = "0.6", features = ["serde1"] }
 rand = { version = "0.8", features = ["serde1"] }
 rand_distr = { version = "0.4" }
-rand_pcg = { version = "0.3", features = ["serde1"] }
+rand_pcg = { version = "0.9", features = ["serde1"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 serde_yaml = "0.8"