diff --git a/sim/Cargo.toml b/sim/Cargo.toml
index b5e23fe..e269d3b 100644
--- a/sim/Cargo.toml
+++ b/sim/Cargo.toml
@@ -24,7 +24,7 @@ lazy_static = "1.4"
 num-traits = "0.2"
 rand_core = { version = "0.6", features = ["serde1"] }
 rand = { version = "0.8", features = ["serde1"] }
-rand_distr = { version = "0.4" }
+rand_distr = { version = "0.5" }
 rand_pcg = { version = "0.3", features = ["serde1"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"