diff --git a/.github/workflows/rust-ci.yml b/.github/workflows/rust-ci.yml
index 280939c6..846408f3 100644
--- a/.github/workflows/rust-ci.yml
+++ b/.github/workflows/rust-ci.yml
@@ -57,7 +57,7 @@ jobs:
         working-directory: codex-rs
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.89
+      - uses: dtolnay/rust-toolchain@1.90
         with:
           components: rustfmt
       - name: cargo fmt
@@ -75,7 +75,7 @@ jobs:
         working-directory: codex-rs
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.89
+      - uses: dtolnay/rust-toolchain@1.90
       - uses: taiki-e/install-action@0c5db7f7f897c03b771660e91d065338615679f4 # v2
         with:
           tool: cargo-shear
@@ -143,7 +143,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.89
+      - uses: dtolnay/rust-toolchain@1.90
         with:
           targets: ${{ matrix.target }}
           components: clippy
diff --git a/.github/workflows/rust-release.yml b/.github/workflows/rust-release.yml
index 29e4a4c7..c808216d 100644
--- a/.github/workflows/rust-release.yml
+++ b/.github/workflows/rust-release.yml
@@ -77,7 +77,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v5
-      - uses: dtolnay/rust-toolchain@1.89
+      - uses: dtolnay/rust-toolchain@1.90
         with:
           targets: ${{ matrix.target }}
 
diff --git a/codex-rs/core/src/client.rs b/codex-rs/core/src/client.rs
index 0ae057b3..e088f9c3 100644
--- a/codex-rs/core/src/client.rs
+++ b/codex-rs/core/src/client.rs
@@ -415,9 +415,6 @@ struct SseEvent {
     delta: Option<String>,
 }
 
-#[derive(Debug, Deserialize)]
-struct ResponseCreated {}
-
 #[derive(Debug, Deserialize)]
 struct ResponseCompleted {
     id: String,
diff --git a/codex-rs/core/src/rollout/recorder.rs b/codex-rs/core/src/rollout/recorder.rs
index 6befdb1f..23e64541 100644
--- a/codex-rs/core/src/rollout/recorder.rs
+++ b/codex-rs/core/src/rollout/recorder.rs
@@ -7,8 +7,6 @@ use std::path::Path;
 use std::path::PathBuf;
 
 use codex_protocol::mcp_protocol::ConversationId;
-use serde::Deserialize;
-use serde::Serialize;
 use serde_json::Value;
 use time::OffsetDateTime;
 use time::format_description::FormatItem;
@@ -28,7 +26,6 @@ use super::policy::is_persisted_response_item;
 use crate::config::Config;
 use crate::default_client::ORIGINATOR;
 use crate::git_info::collect_git_info;
-use codex_protocol::models::ResponseItem;
 use codex_protocol::protocol::InitialHistory;
 use codex_protocol::protocol::ResumedHistory;
 use codex_protocol::protocol::RolloutItem;
@@ -36,19 +33,6 @@ use codex_protocol::protocol::RolloutLine;
 use codex_protocol::protocol::SessionMeta;
 use codex_protocol::protocol::SessionMetaLine;
 
-#[derive(Serialize, Deserialize, Default, Clone)]
-pub struct SessionStateSnapshot {}
-
-#[derive(Serialize, Deserialize, Default, Clone)]
-pub struct SavedSession {
-    pub session: SessionMeta,
-    #[serde(default)]
-    pub items: Vec<ResponseItem>,
-    #[serde(default)]
-    pub state: SessionStateSnapshot,
-    pub session_id: ConversationId,
-}
-
 /// Records all [`ResponseItem`]s for a session and flushes them to disk after
 /// every update.
 ///
diff --git a/codex-rs/core/src/tool_apply_patch.rs b/codex-rs/core/src/tool_apply_patch.rs
index d4039fd1..164a1e12 100644
--- a/codex-rs/core/src/tool_apply_patch.rs
+++ b/codex-rs/core/src/tool_apply_patch.rs
@@ -10,11 +10,6 @@ use crate::openai_tools::ResponsesApiTool;
 
 const APPLY_PATCH_LARK_GRAMMAR: &str = include_str!("tool_apply_patch.lark");
 
-#[derive(Serialize, Deserialize)]
-pub(crate) struct ApplyPatchToolArgs {
-    pub(crate) input: String,
-}
-
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq, Hash)]
 #[serde(rename_all = "snake_case")]
 pub enum ApplyPatchToolType {
diff --git a/codex-rs/rust-toolchain.toml b/codex-rs/rust-toolchain.toml
index 0a9f6e81..7187a331 100644
--- a/codex-rs/rust-toolchain.toml
+++ b/codex-rs/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.89.0"
-components = [ "clippy", "rustfmt", "rust-src"]
+channel = "1.90.0"
+components = ["clippy", "rustfmt", "rust-src"]