diff --git a/Cargo.lock b/Cargo.lock
index c671d92..10d2290 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3753,7 +3753,7 @@ dependencies = [
  "rustapi-rs",
  "serde",
  "serde_json",
- "thiserror 1.0.69",
+ "thiserror 2.0.18",
  "tokio",
  "tracing",
  "uuid",
diff --git a/crates/rustapi-mcp/Cargo.toml b/crates/rustapi-mcp/Cargo.toml
index 37a8388..7110cb0 100644
--- a/crates/rustapi-mcp/Cargo.toml
+++ b/crates/rustapi-mcp/Cargo.toml
@@ -34,7 +34,7 @@ hyper-util = { workspace = true, features = ["tokio"] }
 
 # Utilities
 tracing = { workspace = true }
-thiserror = "1.0"
+thiserror = "2.0"
 uuid = { workspace = true, features = ["v4"] }
 
 # For MCP tool invocation proxy (calls back into the main HTTP API over localhost)