diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index 36eff3c56..5e86b93fc 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -5736,9 +5736,9 @@ dependencies = [
 
 [[package]]
 name = "serde_with"
-version = "3.14.0"
+version = "3.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f2c45cd61fefa9db6f254525d46e392b852e0e61d9a1fd36e5bd183450a556d5"
+checksum = "4fa237f2807440d238e0364a218270b98f767a00d3dada77b1c53ae88940e2e7"
 dependencies = [
  "base64",
  "chrono",
@@ -5747,8 +5747,7 @@ dependencies = [
  "indexmap 2.12.0",
  "schemars 0.9.0",
  "schemars 1.0.4",
- "serde",
- "serde_derive",
+ "serde_core",
  "serde_json",
  "serde_with_macros",
  "time",
@@ -5756,11 +5755,11 @@ dependencies = [
 
 [[package]]
 name = "serde_with_macros"
-version = "3.14.0"
+version = "3.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "de90945e6565ce0d9a25098082ed4ee4002e047cb59892c318d66821e14bb30f"
+checksum = "52a8e3ca0ca629121f70ab50f95249e5a6f925cc0f6ffe8256c45b728875706c"
 dependencies = [
- "darling 0.20.11",
+ "darling 0.21.3",
  "proc-macro2",
  "quote",
  "syn 2.0.104",
diff --git a/codex-rs/Cargo.toml b/codex-rs/Cargo.toml
index 053d79d7e..1ca55f98a 100644
--- a/codex-rs/Cargo.toml
+++ b/codex-rs/Cargo.toml
@@ -178,7 +178,7 @@ seccompiler = "0.5.0"
 sentry = "0.34.0"
 serde = "1"
 serde_json = "1"
-serde_with = "3.14"
+serde_with = "3.16"
 serial_test = "3.2.0"
 sha1 = "0.10.6"
 sha2 = "0.10"