diff --git a/Cargo.toml b/Cargo.toml
index a3c6d4c..fc61d18 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "openai-api-rs"
-version = "3.0.1"
+version = "4.0.0"
 edition = "2021"
 authors = ["Dongri Jin <dongrify@gmail.com>"]
 license = "MIT"
diff --git a/README.md b/README.md
index 5456872..25f5b43 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ Check out the [docs.rs](https://docs.rs/openai-api-rs/).
 Cargo.toml
 ```toml
 [dependencies]
-openai-api-rs = "3.0.1"
+openai-api-rs = "4.0.0"
 ```
 
 ## Usage
@@ -84,7 +84,7 @@ Check out the [full API documentation](https://platform.openai.com/docs/api-refe
 - [x] [Embeddings](https://platform.openai.com/docs/api-reference/embeddings)
 - [x] [Audio](https://platform.openai.com/docs/api-reference/audio)
 - [x] [Files](https://platform.openai.com/docs/api-reference/files)
-- [x] [Fine-tunes](https://platform.openai.com/docs/api-reference/fine-tunes)
+- [x] [Fine-tuning](https://platform.openai.com/docs/api-reference/fine-tuning)
 - [x] [Moderations](https://platform.openai.com/docs/api-reference/moderations)
 - [x] [Function calling](https://platform.openai.com/docs/guides/gpt/function-calling)
 - [x] [Assistants](https://platform.openai.com/docs/assistants/overview)
diff --git a/src/v1/api.rs b/src/v1/api.rs
index 3a9e9a0..1686f23 100644
--- a/src/v1/api.rs
+++ b/src/v1/api.rs
@@ -17,8 +17,9 @@ use crate::v1::file::{
     FileUploadResponse,
 };
 use crate::v1::fine_tuning::{
-    CreateFineTuningJobRequest, ListFineTuningJobEventsRequest, RetrieveFineTuningJobRequest, CancelFineTuningJobRequest,
-    FineTuningPagination, FineTuningJobObject, FineTuningJobEvent,
+    CancelFineTuningJobRequest, CreateFineTuningJobRequest, FineTuningJobEvent,
+    FineTuningJobObject, FineTuningPagination, ListFineTuningJobEventsRequest,
+    RetrieveFineTuningJobRequest,
 };
 use crate::v1::image::{
     ImageEditRequest, ImageEditResponse, ImageGenerationRequest, ImageGenerationResponse,
@@ -346,7 +347,9 @@ impl Client {
         }
     }
 
-    pub fn list_fine_tuning_jobs(&self) -> Result<FineTuningPagination<FineTuningJobObject>, APIError> {
+    pub fn list_fine_tuning_jobs(
+        &self,
+    ) -> Result<FineTuningPagination<FineTuningJobObject>, APIError> {
         let res = self.get("/fine_tuning/jobs")?;
         let r = res.json::<FineTuningPagination<FineTuningJobObject>>();
         match r {
@@ -359,7 +362,10 @@ impl Client {
         &self,
         req: ListFineTuningJobEventsRequest,
     ) -> Result<FineTuningPagination<FineTuningJobEvent>, APIError> {
-        let res = self.get(&format!("/fine_tuning/jobs/{}/events", req.fine_tuning_job_id))?;
+        let res = self.get(&format!(
+            "/fine_tuning/jobs/{}/events",
+            req.fine_tuning_job_id
+        ))?;
         let r = res.json::<FineTuningPagination<FineTuningJobEvent>>();
         match r {
             Ok(r) => Ok(r),
@@ -383,7 +389,10 @@ impl Client {
         &self,
         req: CancelFineTuningJobRequest,
     ) -> Result<FineTuningJobObject, APIError> {
-        let res = self.post(&format!("/fine_tuning/jobs/{}/cancel", req.fine_tuning_job_id), &req)?;
+        let res = self.post(
+            &format!("/fine_tuning/jobs/{}/cancel", req.fine_tuning_job_id),
+            &req,
+        )?;
         let r = res.json::<FineTuningJobObject>();
         match r {
             Ok(r) => Ok(r),
diff --git a/src/v1/fine_tuning.rs b/src/v1/fine_tuning.rs
index ecff8d7..4b8df23 100644
--- a/src/v1/fine_tuning.rs
+++ b/src/v1/fine_tuning.rs
@@ -2,7 +2,6 @@ use serde::{Deserialize, Serialize};
 
 use crate::impl_builder_methods;
 
-
 #[derive(Debug, Serialize, Clone)]
 pub struct CreateFineTuningJobRequest {
     pub model: String,
@@ -44,7 +43,7 @@ pub struct ListFineTuningJobsRequest {
 }
 
 impl ListFineTuningJobsRequest {
-    pub fn new(fine_tune_id: String) -> Self {
+    pub fn new(_fine_tune_id: String) -> Self {
         Self {
             after: None,
             limit: None,
@@ -144,4 +143,3 @@ pub struct HyperParameters {
     #[serde(skip_serializing_if = "Option::is_none")]
     pub n_epochs: Option<String>,
 }
-