diff --git a/codex-rs/Cargo.lock b/codex-rs/Cargo.lock
index e022fc50bb..1a274985e8 100644
--- a/codex-rs/Cargo.lock
+++ b/codex-rs/Cargo.lock
@@ -853,7 +853,6 @@ dependencies = [
  "pretty_assertions",
  "serde",
  "serde_json",
- "serial_test",
  "tempfile",
  "tokio",
  "toml",
diff --git a/codex-rs/app-server/Cargo.toml b/codex-rs/app-server/Cargo.toml
index c1efb2ef93..5efbefd6b0 100644
--- a/codex-rs/app-server/Cargo.toml
+++ b/codex-rs/app-server/Cargo.toml
@@ -47,7 +47,6 @@ base64 = { workspace = true }
 core_test_support = { workspace = true }
 os_info = { workspace = true }
 pretty_assertions = { workspace = true }
-serial_test = { workspace = true }
 tempfile = { workspace = true }
 toml = { workspace = true }
 wiremock = { workspace = true }
diff --git a/codex-rs/app-server/tests/suite/login.rs b/codex-rs/app-server/tests/suite/login.rs
index 110d2dafec..220769b7d6 100644
--- a/codex-rs/app-server/tests/suite/login.rs
+++ b/codex-rs/app-server/tests/suite/login.rs
@@ -13,7 +13,6 @@ use codex_app_server_protocol::LoginChatGptResponse;
 use codex_app_server_protocol::LogoutChatGptResponse;
 use codex_app_server_protocol::RequestId;
 use codex_login::login_with_api_key;
-use serial_test::serial;
 use tempfile::TempDir;
 use tokio::time::timeout;
 
@@ -42,7 +41,6 @@ stream_max_retries = 0
 }
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-#[serial(login_server)]
 async fn logout_chatgpt_removes_auth() {
     let codex_home = TempDir::new().unwrap_or_else(|e| panic!("create tempdir: {e}"));
     create_config_toml(codex_home.path()).expect("write config.toml");
@@ -96,7 +94,6 @@ async fn logout_chatgpt_removes_auth() {
 }
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-#[serial(login_server)]
 async fn login_and_cancel_chatgpt() {
     let codex_home = TempDir::new().unwrap_or_else(|e| panic!("create tempdir: {e}"));
     create_config_toml(codex_home.path()).unwrap_or_else(|err| panic!("write config.toml: {err}"));
@@ -179,7 +176,6 @@ forced_chatgpt_workspace_id = "{workspace_id}"
 }
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-#[serial(login_server)]
 async fn login_chatgpt_rejected_when_forced_api() {
     let codex_home = TempDir::new().unwrap_or_else(|e| panic!("create tempdir: {e}"));
     create_config_toml_forced_login(codex_home.path(), "api")
@@ -212,7 +208,6 @@ async fn login_chatgpt_rejected_when_forced_api() {
 }
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
-#[serial(login_server)]
 async fn login_chatgpt_includes_forced_workspace_query_param() {
     let codex_home = TempDir::new().unwrap_or_else(|e| panic!("create tempdir: {e}"));
     create_config_toml_forced_workspace(codex_home.path(), "ws-forced")