diff --git a/sim/Cargo.toml b/sim/Cargo.toml
index b5e23fe..c17edf5 100644
--- a/sim/Cargo.toml
+++ b/sim/Cargo.toml
@@ -31,7 +31,7 @@ serde_json = "1.0"
 serde_yaml = "0.8"
 sim_derive = { version = "0.13", path = "../sim_derive" }
 simx = { version = "0.13", path = "../simx", optional = true }
-thiserror = "1.0"
+thiserror = "2.0"
 wasm-bindgen = "0.2"
 web-sys = { version = "0.3", features = [ "console" ] }