diff --git a/Cargo.lock b/Cargo.lock
index 78e3c320..134e5e60 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1169,7 +1169,7 @@ dependencies = [
  "serde_json",
  "sha2 0.11.0",
  "tempfile",
- "thiserror 1.0.69",
+ "thiserror 2.0.18",
  "tokenizers 0.20.4",
  "ureq",
 ]
diff --git a/src/rust/crates/fathomdb-embedder/Cargo.toml b/src/rust/crates/fathomdb-embedder/Cargo.toml
index 8ea29a4a..9a8d5ea0 100644
--- a/src/rust/crates/fathomdb-embedder/Cargo.toml
+++ b/src/rust/crates/fathomdb-embedder/Cargo.toml
@@ -18,7 +18,7 @@ sha2 = { version = "0.11", optional = true }
 dirs = { version = "5", optional = true }
 fs2 = { version = "0.4", optional = true }
 serde_json = { version = "1", optional = true }
-thiserror = { version = "1", optional = true }
+thiserror = { version = "2", optional = true }
 
 # Candle stack + tokenizer for the default `CandleBgeEmbedder` (EU-4).
 # Pinned to candle 0.10 (current stable line) and tokenizers 0.20. Gated