diff --git a/physerver/Cargo.toml b/physerver/Cargo.toml
index 4ca5250..187f6b5 100644
--- a/physerver/Cargo.toml
+++ b/physerver/Cargo.toml
@@ -76,7 +76,7 @@ clap = { version = "4.4", features = ["derive"] }
 
 # Error handling
 anyhow = "1.0"
-thiserror = "1.0"
+thiserror = "2.0"
 
 # Utilities
 crossbeam-channel = "0.5"
diff --git a/physerver/crates/phycmd-core/Cargo.toml b/physerver/crates/phycmd-core/Cargo.toml
index dc01e56..f586e11 100644
--- a/physerver/crates/phycmd-core/Cargo.toml
+++ b/physerver/crates/phycmd-core/Cargo.toml
@@ -12,7 +12,7 @@ path = "src/lib.rs"
 
 [dependencies]
 # Protocol / CRC
-thiserror = "1.0"
+thiserror = "2.0"
 
 # Serde for Command/Status wire types (consumed by IPC / HTTP downstream)
 serde = { version = "1.0", features = ["derive"] }
diff --git a/physerver/crates/phycmd-rust/Cargo.toml b/physerver/crates/phycmd-rust/Cargo.toml
index 4029f85..5f9a3f8 100644
--- a/physerver/crates/phycmd-rust/Cargo.toml
+++ b/physerver/crates/phycmd-rust/Cargo.toml
@@ -13,7 +13,7 @@ path = "src/lib.rs"
 [dependencies]
 phycmd-core = { path = "../phycmd-core", default-features = false }
 anyhow = "1.0"
-thiserror = "1.0"
+thiserror = "2.0"
 tracing = "0.1"
 # Re-exported only so that `StatusReceiver = broadcast::Receiver<StatusFrame>`
 # can be aliased publicly. Same feature subset as phycmd-core.