diff --git a/src/check.rs b/src/check.rs
index 6aefcc0..b968c55 100644
--- a/src/check.rs
+++ b/src/check.rs
@@ -73,7 +73,7 @@ pub async fn get_updates(references: &Option<Vec<String>>, config: &Config) -> V
                 let token = get_token(
                     image_map.get(registry).unwrap(),
                     &auth_url,
-                    &credentials,
+                    credentials,
                     &client,
                 )
                 .await;
@@ -107,7 +107,7 @@ pub async fn get_updates(references: &Option<Vec<String>>, config: &Config) -> V
         let is_ignored = ignored_registries.contains(&&image.registry) || config.images.exclude.iter().any(|item| image.reference.starts_with(item));
         if !is_ignored {
             let token = tokens.get(image.registry.as_str()).unwrap();
-            let future = image.check(token.as_ref(), config, &client);
+            let future = image.check(token.as_deref(), config, &client);
             handles.push(future);
         }
     }
diff --git a/src/docker.rs b/src/docker.rs
index af90896..b197629 100644
--- a/src/docker.rs
+++ b/src/docker.rs
@@ -4,7 +4,7 @@ use futures::future::join_all;
 
 use crate::{config::Config, error, structs::image::Image};
 
-fn create_docker_client(socket: Option<&String>) -> Docker {
+fn create_docker_client(socket: Option<&str>) -> Docker {
     let client: Result<Docker, bollard::errors::Error> = match socket {
         Some(sock) => {
             if sock.starts_with("unix://") {
@@ -41,7 +41,7 @@ pub async fn get_images_from_docker_daemon(
     config: &Config,
     references: &Option<Vec<String>>,
 ) -> Vec<Image> {
-    let client: Docker = create_docker_client(config.socket.as_ref());
+    let client: Docker = create_docker_client(config.socket.as_deref());
     match references {
         Some(refs) => {
             let mut inspect_handles = Vec::with_capacity(refs.len());
diff --git a/src/registry.rs b/src/registry.rs
index ea4286e..c3ae73b 100644
--- a/src/registry.rs
+++ b/src/registry.rs
@@ -43,7 +43,7 @@ pub async fn check_auth(registry: &str, config: &Config, client: &Client) -> Opt
 
 pub async fn get_latest_digest(
     image: &Image,
-    token: Option<&String>,
+    token: Option<&str>,
     config: &Config,
     client: &Client,
 ) -> Image {
@@ -119,7 +119,7 @@ pub async fn get_token(
 pub async fn get_latest_tag(
     image: &Image,
     base: &Version,
-    token: Option<&String>,
+    token: Option<&str>,
     config: &Config,
     client: &Client,
 ) -> Image {
diff --git a/src/server.rs b/src/server.rs
index 846fe3e..0e1aa84 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -33,7 +33,7 @@ const FAVICON_ICO: &[u8] = include_bytes!("static/favicon.ico");
 const FAVICON_SVG: &[u8] = include_bytes!("static/favicon.svg");
 const APPLE_TOUCH_ICON: &[u8] = include_bytes!("static/apple-touch-icon.png");
 
-const SORT_ORDER: [&'static str; 8] = [
+const SORT_ORDER: [&str; 8] = [
     "monitored_images",
     "updates_available",
     "major_updates",
diff --git a/src/structs/image.rs b/src/structs/image.rs
index 8e9936e..1ceb5ef 100644
--- a/src/structs/image.rs
+++ b/src/structs/image.rs
@@ -183,7 +183,7 @@ impl Image {
     }
 
     /// Checks if the image has an update
-    pub async fn check(&self, token: Option<&String>, config: &Config, client: &Client) -> Self {
+    pub async fn check(&self, token: Option<&str>, config: &Config, client: &Client) -> Self {
         match &self.version_info {
             Some(data) => get_latest_tag(self, &data.current_tag, token, config, client).await,
             None => match self.digest_info {
diff --git a/src/utils/request.rs b/src/utils/request.rs
index 30c38d8..ad36521 100644
--- a/src/utils/request.rs
+++ b/src/utils/request.rs
@@ -40,7 +40,7 @@ pub fn get_protocol(
     }
 }
 
-pub fn to_bearer_string(token: &Option<&String>) -> Option<String> {
+pub fn to_bearer_string(token: &Option<&str>) -> Option<String> {
     token.as_ref().map(|t| format!("Bearer {}", t))
 }