diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index fa3fbe85a..e9d39133b 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -487,9 +487,9 @@ checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
 
 [[package]]
 name = "axum"
-version = "0.8.4"
+version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "021e862c184ae977658b36c4500f7feac3221ca5da43e3f25bd04ab6c79a29b5"
+checksum = "8a18ed336352031311f4e0b4dd2ff392d4fbb370777c9d18d7fc9d7359f73871"
 dependencies = [
  "axum-core",
  "bytes",
@@ -505,8 +505,7 @@ dependencies = [
  "mime",
  "percent-encoding",
  "pin-project-lite",
- "rustversion",
- "serde",
+ "serde_core",
  "sync_wrapper",
  "tokio",
  "tower",
@@ -516,9 +515,9 @@ dependencies = [
 
 [[package]]
 name = "axum-core"
-version = "0.5.2"
+version = "0.5.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "68464cd0412f486726fb3373129ef5d2993f90c34bc2bc1c1e9943b2f4fc7ca6"
+checksum = "59446ce19cd142f8833f856eb31f3eb097812d1479ab224f54d72428ca21ea22"
 dependencies = [
  "bytes",
  "futures-core",
@@ -527,7 +526,6 @@ dependencies = [
  "http-body-util",
  "mime",
  "pin-project-lite",
- "rustversion",
  "sync_wrapper",
  "tower-layer",
  "tower-service",
@@ -2210,6 +2208,15 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "34aa73646ffb006b8f5147f3dc182bd4bcb190227ce861fc4a4844bf8e3cb2c0"
 
+[[package]]
+name = "encoding_rs"
+version = "0.8.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75030f3c4f45dafd7586dd6780965a8c7e8e285a5ecb86713e63a79c5b2766f3"
+dependencies = [
+ "cfg-if",
+]
+
 [[package]]
 name = "endi"
 version = "1.1.0"
@@ -2964,10 +2971,12 @@ dependencies = [
  "libc",
  "percent-encoding",
  "pin-project-lite",
- "socket2 0.6.0",
+ "socket2 0.5.10",
+ "system-configuration",
  "tokio",
  "tower-service",
  "tracing",
+ "windows-registry",
 ]
 
 [[package]]
@@ -4687,7 +4696,7 @@ dependencies = [
  "quinn-udp",
  "rustc-hash 2.1.1",
  "rustls",
- "socket2 0.6.0",
+ "socket2 0.5.10",
  "thiserror 2.0.17",
  "tokio",
  "tracing",
@@ -4724,7 +4733,7 @@ dependencies = [
  "cfg_aliases 0.2.1",
  "libc",
  "once_cell",
- "socket2 0.6.0",
+ "socket2 0.5.10",
  "tracing",
  "windows-sys 0.60.2",
 ]
@@ -4942,9 +4951,11 @@ checksum = "d429f34c8092b2d42c7c93cec323bb4adeb7c67698f70839adec842ec10c7ceb"
 dependencies = [
  "base64",
  "bytes",
+ "encoding_rs",
  "futures-channel",
  "futures-core",
  "futures-util",
+ "h2",
  "http",
  "http-body",
  "http-body-util",
@@ -4954,6 +4965,7 @@ dependencies = [
  "hyper-util",
  "js-sys",
  "log",
+ "mime",
  "native-tls",
  "percent-encoding",
  "pin-project-lite",
@@ -6064,6 +6076,27 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "system-configuration"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c879d448e9d986b661742763247d3693ed13609438cf3d006f51f5368a5ba6b"
+dependencies = [
+ "bitflags 2.10.0",
+ "core-foundation 0.9.4",
+ "system-configuration-sys",
+]
+
+[[package]]
+name = "system-configuration-sys"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e1d1b10ced5ca923a1fcb8d03e96b8d3268065d724548c0211415ff6ac6bac4"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.23.0"
@@ -7205,6 +7238,17 @@ dependencies = [
  "windows-link 0.1.3",
 ]
 
+[[package]]
+name = "windows-registry"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b8a9ed28765efc97bbc954883f4e6796c33a06546ebafacbabee9696967499e"
+dependencies = [
+ "windows-link 0.1.3",
+ "windows-result",
+ "windows-strings",
+]
+
 [[package]]
 name = "windows-result"
 version = "0.3.4"
diff --git a/codex-rs/core/src/default_client.rs b/codex-rs/core/src/default_client.rs
index 2b9497476..50cdb680e 100644
--- a/codex-rs/core/src/default_client.rs
+++ b/codex-rs/core/src/default_client.rs
@@ -387,10 +387,8 @@ mod tests {
         use regex_lite::escape;
         let user_agent = get_codex_user_agent();
         let originator = escape(originator().value.as_str());
-        let pattern = format!(
-            r"^{}/\d+\.\d+\.\d+ \(Mac OS \d+\.\d+\.\d+; (x86_64|arm64)\) (\S+)$",
-            originator,
-        );
+        let pattern =
+            format!(r"^{originator}/\d+\.\d+\.\d+ \(Mac OS \d+\.\d+\.\d+; (x86_64|arm64)\) (\S+)$");
         let re = Regex::new(&pattern).unwrap();
         assert!(re.is_match(&user_agent));
     }