diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index 35424d822a..512590a329 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -6268,9 +6268,9 @@ dependencies = [
 
 [[package]]
 name = "tiktoken-rs"
-version = "0.7.0"
+version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "25563eeba904d770acf527e8b370fe9a5547bacd20ff84a0b6c3bc41288e5625"
+checksum = "3a19830747d9034cd9da43a60eaa8e552dfda7712424aebf187b7a60126bae0d"
 dependencies = [
  "anyhow",
  "base64",
diff --git a/codex-rs/utils/tokenizer/Cargo.toml b/codex-rs/utils/tokenizer/Cargo.toml
index 6f6b4decf0..59f1496cfc 100644
--- a/codex-rs/utils/tokenizer/Cargo.toml
+++ b/codex-rs/utils/tokenizer/Cargo.toml
@@ -9,7 +9,7 @@ workspace = true
 [dependencies]
 anyhow = { workspace = true }
 thiserror = { workspace = true }
-tiktoken-rs = "0.7"
+tiktoken-rs = "0.9"
 
 [dev-dependencies]
 pretty_assertions = { workspace = true }