diff --git a/Cargo.lock b/Cargo.lock
index 4b333da..bc162d6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3039,7 +3039,7 @@ dependencies = [
  "serde_json",
  "serial_test",
  "tempfile",
- "thiserror 1.0.69",
+ "thiserror 2.0.18",
  "tokio",
  "tokio-test",
  "tracing",
diff --git a/crates/rlm-test-utils/Cargo.toml b/crates/rlm-test-utils/Cargo.toml
index f509b5d..7d5712e 100644
--- a/crates/rlm-test-utils/Cargo.toml
+++ b/crates/rlm-test-utils/Cargo.toml
@@ -12,7 +12,7 @@ keywords = ["testing", "integration", "llm", "vault", "security"]
 tokio = { version = "1.0", features = ["full"] }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-thiserror = "1.0"
+thiserror = "2.0"
 tracing = "0.1"
 tracing-subscriber = "0.3"
 uuid = { version = "1.0", features = ["v4", "serde"] }