diff --git a/Cargo.lock b/Cargo.lock
index def49a6..a51b163 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3218,9 +3218,9 @@ dependencies = [
 name = "jsonrpc-example"
 version = "1.0.0"
 dependencies = [
- "actix-web 3.3.3",
- "bytes 0.5.6",
- "env_logger 0.8.4",
+ "actix-web 4.0.0-beta.21",
+ "bytes 1.1.0",
+ "env_logger 0.9.0",
  "futures-util",
  "log",
  "serde 1.0.136",
diff --git a/json/jsonrpc/Cargo.toml b/json/jsonrpc/Cargo.toml
index 0c766e3..222a957 100644
--- a/json/jsonrpc/Cargo.toml
+++ b/json/jsonrpc/Cargo.toml
@@ -4,11 +4,11 @@ version = "1.0.0"
 edition = "2021"
 
 [dependencies]
-actix-web = "3"
+actix-web = "4.0.0-beta.21"
 
-bytes = "0.5"
-env_logger = "0.8"
+bytes = "1.1.0"
+env_logger = "0.9.0"
 futures-util = "0.3"
 log = "0.4"
 serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
+serde_json = "1.0.78"
diff --git a/json/jsonrpc/src/main.rs b/json/jsonrpc/src/main.rs
index 336c1dd..d5477a7 100644
--- a/json/jsonrpc/src/main.rs
+++ b/json/jsonrpc/src/main.rs
@@ -119,7 +119,7 @@ impl ImplNetwork for ObjNetwork {
         d: u64,
     ) -> Pin<Box<dyn Future<Output = Result<String, Box<dyn error::Error>>>>> {
         async move {
-            actix_web::rt::time::delay_for(Duration::from_secs(d)).await;
+            actix_web::rt::time::sleep(Duration::from_secs(d)).await;
             Ok(String::from("pong"))
         }
         .boxed_local()
@@ -155,7 +155,7 @@ async fn main() -> std::io::Result<()> {
     HttpServer::new(move || {
         let app_state = AppState::new(network.clone());
         App::new()
-            .data(app_state)
+            .app_data(web::Data::new(app_state))
             .wrap(middleware::Logger::default())
             .service(web::resource("/").route(web::post().to(rpc_handler)))
     })