diff --git a/Cargo.lock b/Cargo.lock
index 6643dd5..054fd55 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -775,18 +775,18 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.69"
+version = "2.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6aaf5339b578ea85b50e080feb250a3e8ae8cfcdff9a461c9ec2904bc923f52"
+checksum = "4288b5bcbc7920c07a1149a35cf9590a2aa808e0bc1eafaade0b80947865fbc4"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.69"
+version = "2.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4fee6c4efc90059e10f81e6d42c60a18f76588c3d74cb83a0b242a2b6c7504c1"
+checksum = "ebc4ee7f67670e9b64d05fa4253e753e016c6c95ff35b89b7941d6b856dec1d5"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/Cargo.toml b/Cargo.toml
index c3c3d8e..7227e50 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,7 +32,7 @@ gc-forge-presets  = { path = "crates/gc-forge-presets",  version = "0.1.0" }
 # Common third-party dependencies (versions pinned at workspace level so all
 # crates use the same; pulled in only by the crates that need them).
 anyhow      = "1.0"
-thiserror   = "1.0"
+thiserror   = "2.0"
 clap        = { version = "4.5", features = ["derive"] }
 serde       = { version = "1.0", features = ["derive"] }
 serde_json  = "1.0"