diff --git a/backend/Cargo.lock b/backend/Cargo.lock
index 7c17f02c..89273241 100644
--- a/backend/Cargo.lock
+++ b/backend/Cargo.lock
@@ -2546,7 +2546,7 @@ dependencies = [
  "console_error_panic_hook",
  "insta",
  "reconcile",
- "thiserror 1.0.69",
+ "thiserror 2.0.12",
  "wasm-bindgen",
  "wasm-bindgen-test",
 ]
@@ -2576,7 +2576,7 @@ dependencies = [
  "serde_yaml",
  "sqlx",
  "sync_lib",
- "thiserror 1.0.69",
+ "thiserror 2.0.12",
  "tokio",
  "tower-http",
  "tracing",
diff --git a/backend/Cargo.toml b/backend/Cargo.toml
index f45527e0..cc3ac642 100644
--- a/backend/Cargo.toml
+++ b/backend/Cargo.toml
@@ -16,7 +16,7 @@ version = "0.3.9"
 
 [workspace.dependencies]
 serde = { version = "1.0.219", default-features = false, features = ["derive"] }
-thiserror = { version = "1.0.66", default-features = false  }
+thiserror = { version = "2.0.12", default-features = false  }
 
 [profile.release]
 codegen-units = 1