diff --git a/Cargo.lock b/Cargo.lock
index 59587ef5..d6fc5e7b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2343,7 +2343,7 @@ dependencies = [
  "schemars",
  "serde",
  "serde_json",
- "thiserror 1.0.69",
+ "thiserror 2.0.3",
  "tokio",
  "toml",
  "toml_edit",
diff --git a/Cargo.toml b/Cargo.toml
index 399d25f6..e1121260 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -53,7 +53,7 @@ serde = { version = "1.0.215", features = ["derive"] }
 serde_json = "1.0.127"
 similar = "2.6.0"
 tabwriter = "1.4.0"
-thiserror = { version = "1", default-features = false }
+thiserror = { version = "2", default-features = false }
 tempfile = "3.14.0"
 test-common = { path = "test-common" }
 thouart = { git = "https://github.com/oxidecomputer/thouart" }