diff --git a/Cargo.lock b/Cargo.lock
index ff711c85..2f271569 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1930,9 +1930,9 @@ dependencies = [
 
 [[package]]
 name = "chardetng"
-version = "0.1.17"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14b8f0b65b7b08ae3c8187e8d77174de20cb6777864c6b832d8ad365999cf1ea"
+checksum = "13de944a44b5064ee5d3a5ceccc49a41bfec50f2580e66f82e87703acdb88b53"
 dependencies = [
  "cfg-if",
  "encoding_rs",
diff --git a/Cargo.toml b/Cargo.toml
index 2cc42f82..2d35de7b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -302,7 +302,7 @@ gix = { version = "0.83.0", default-features = false, features = ["sha1"] }
 
 # ── Codex-only external deps ────────────────────────────────────
 async-channel = "2.3.1"
-chardetng = "0.1.17"
+chardetng = "1.0.0"
 crypto_box = { version = "0.9.1", features = ["seal"] }
 ed25519-dalek = { version = "2.2.0", features = ["pkcs8", "rand_core"] }
 tokio-test = "0.4"
diff --git a/crates/codex/Cargo.toml b/crates/codex/Cargo.toml
index 8b7c265d..a1ac3f58 100644
--- a/crates/codex/Cargo.toml
+++ b/crates/codex/Cargo.toml
@@ -245,7 +245,7 @@ axum = { version = "0.8", default-features = false }
 base64 = "0.22.1"
 bm25 = "2.3.2"
 bytes = "1.10.1"
-chardetng = "0.1.17"
+chardetng = "1.0.0"
 chrono = "0.4.43"
 clap = "4"
 clap_complete = "4"