diff --git a/filtermail/Cargo.lock b/filtermail/Cargo.lock
index 5e72b821..5c91650b 100644
--- a/filtermail/Cargo.lock
+++ b/filtermail/Cargo.lock
@@ -912,18 +912,18 @@ checksum = "614b328ff036a4ef882c61570f72918f7e9c5bee1da33f8e7f91e01daee7e56c"
 
 [[package]]
 name = "thiserror"
-version = "2.0.17"
+version = "2.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f63587ca0f12b72a0600bcba1d40081f830876000bb46dd2337a3051618f4fc8"
+checksum = "4288b5bcbc7920c07a1149a35cf9590a2aa808e0bc1eafaade0b80947865fbc4"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "2.0.17"
+version = "2.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ff15c8ecd7de3849db632e14d18d2571fa09dfc5ed93479bc4485c7a517c913"
+checksum = "ebc4ee7f67670e9b64d05fa4253e753e016c6c95ff35b89b7941d6b856dec1d5"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/filtermail/Cargo.toml b/filtermail/Cargo.toml
index 14919b42..26194a67 100644
--- a/filtermail/Cargo.toml
+++ b/filtermail/Cargo.toml
@@ -14,7 +14,7 @@ base64 = "0.22.1"
 serde = { version = "1.0.228", features = ["derive"] }
 serini = "0.2.2"
 tokio = { version = "1.49.0", features = ["full"] }
-thiserror = "2.0.17"
+thiserror = "2.0.18"
 mailparse = "0.16.1"
 lettre = { version = "0.11.19", default-features = false, features = [
   "smtp-transport",