diff --git a/Cargo.toml b/Cargo.toml
index 670608ac3..cd6d137b4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,19 +18,19 @@ edition = "2018"
 [features]
 default = ["native-tls"]
 
-native-tls = ["reqwest/native-tls"]
-rustls = ["reqwest/rustls-tls"]
-vendored-tls = ["reqwest/native-tls-vendored"]
+native-tls = ["reqwest/native-tls", "yup-oauth2/hyper-tls"]
+native-tls-vendored = ["reqwest/native-tls-vendored", "yup-oauth2/hyper-tls"]
+rustls-tls = ["reqwest/rustls-tls", "yup-oauth2/hyper-rustls"]
 
 [dependencies]
 serde = { version = "1", features = ["derive"] }
 serde_json = { version = "1", features = ["preserve_order"] }
 tokio = { version = "1", features = ["fs"] }
-reqwest = { version = "0.11", features = ["json"], default-features = false }
+reqwest = { version = "0.12", features = ["json", "charset", "http2", "macos-system-configuration"], default-features = false }
 chrono = "0.4"
 thiserror = "1"
 dotenvy = "0.15"
-yup-oauth2 = "9"
+yup-oauth2 = { version = "11", features = ["service-account", "ring"], default-features = false }
 
 [dev-dependencies]
 tokio = { version = "1.0", features = ["rt-multi-thread", "macros"] }
diff --git a/src/client/oauth.rs b/src/client/oauth.rs
index 9d3388068..ea137c22f 100644
--- a/src/client/oauth.rs
+++ b/src/client/oauth.rs
@@ -1,8 +1,6 @@
 use std::path::PathBuf;
 
 use yup_oauth2::authenticator::{Authenticator, DefaultHyperClient, HyperClientBuilder};
-use yup_oauth2::hyper::client::HttpConnector;
-use yup_oauth2::hyper_rustls::HttpsConnector;
 use yup_oauth2::ServiceAccountAuthenticator;
 
 const FIREBASE_OAUTH_SCOPE: &str = "https://www.googleapis.com/auth/firebase.messaging";
@@ -34,7 +32,7 @@ impl OauthError {
 }
 
 pub(crate) struct OauthClient {
-    authenticator: Authenticator<HttpsConnector<HttpConnector>>,
+    authenticator: Authenticator<<DefaultHyperClient as HyperClientBuilder>::Connector>,
     project_id: String,
 }
 
@@ -55,8 +53,7 @@ impl OauthClient {
     ) -> Result<Self, OauthError> {
         let key = yup_oauth2::parse_service_account_key(service_account_key_json_string)
             .map_err(OauthError::ServiceAccountKeyReadingFailed)?;
-        let oauth_client = DefaultHyperClient.build_hyper_client().map_err(OauthError::Oauth)?;
-        let builder = ServiceAccountAuthenticator::with_client(key.clone(), oauth_client);
+        let builder = ServiceAccountAuthenticator::builder(key.clone());
         let builder = if let Some(path) = token_cache_json_path {
             builder.persist_tokens_to_disk(path)
         } else {
diff --git a/src/message/mod.rs b/src/message/mod.rs
index dba27d2b2..3615410e2 100644
--- a/src/message/mod.rs
+++ b/src/message/mod.rs
@@ -81,11 +81,13 @@ impl AsRef<Message> for Message {
     }
 }
 
-/// Wrap the message in a "message" field
+#[allow(clippy::bool_comparison)]
 fn is_validate_only_default(b: &bool) -> bool {
     *b == false
 }
 
+/// Data for FCM send API request body JSON
+/// <https://firebase.google.com/docs/reference/fcm/rest/v1/projects.messages/send?authuser=0#request-body>
 #[derive(Serialize)]
 pub(crate) struct MessageWrapper<'a> {
     #[serde(skip_serializing_if = "is_validate_only_default")]