diff --git a/Cargo.lock b/Cargo.lock
index 6ca53a0..a05ef60 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -705,6 +705,12 @@ version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
 
+[[package]]
+name = "ascii"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eab1c04a571841102f5345a8fc0f6bb3d31c315dec879b5c6e42e40ce7ffa34e"
+
 [[package]]
 name = "askama"
 version = "0.9.0"
@@ -1598,6 +1604,19 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "combine"
+version = "3.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da3da6baa321ec19e1cc41d31bf599f00c783d0517095cdaf0332e3fe8d20680"
+dependencies = [
+ "ascii",
+ "byteorder",
+ "either",
+ "memchr",
+ "unreachable",
+]
+
 [[package]]
 name = "combine"
 version = "4.4.0"
@@ -2362,6 +2381,17 @@ version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "15496a72fabf0e62bdc3df11a59a3787429221dd0710ba8ef163d6f7a9112c94"
 
+[[package]]
+name = "futures-enum"
+version = "0.1.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3422d14de7903a52e9dbc10ae05a7e14445ec61890100e098754e120b2bd7b1e"
+dependencies = [
+ "derive_utils",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "futures-executor"
 version = "0.3.13"
@@ -2540,6 +2570,16 @@ dependencies = [
  "web-sys",
 ]
 
+[[package]]
+name = "graphql-parser"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d1abd4ce5247dfc04a03ccde70f87a048458c9356c7e41d21ad8c407b3dde6f2"
+dependencies = [
+ "combine 3.8.1",
+ "thiserror",
+]
+
 [[package]]
 name = "h2"
 version = "0.2.7"
@@ -2957,18 +2997,24 @@ dependencies = [
 
 [[package]]
 name = "juniper"
-version = "0.14.2"
+version = "0.15.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f662ba51e2fbc3d6dd1ca66be70b44963606a34473156abddcb0351fc6caa668"
+checksum = "4e1330b4b3b2fe7de256fd08738f7fba28ffa574109c834988c28972f0760dbd"
 dependencies = [
+ "async-trait",
+ "bson",
  "chrono",
  "fnv",
+ "futures",
+ "futures-enum",
+ "graphql-parser",
  "indexmap",
  "juniper_codegen",
  "serde 1.0.117",
- "serde_derive",
+ "smartstring",
+ "static_assertions 1.1.0",
  "url",
- "uuid 0.7.4",
+ "uuid 0.8.1",
 ]
 
 [[package]]
@@ -3003,10 +3049,11 @@ dependencies = [
 
 [[package]]
 name = "juniper_codegen"
-version = "0.14.2"
+version = "0.15.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d40af234d8e971a9d7dda93ffbcc8a44a93f17e69e3067f72ce7a6894c41d51b"
+checksum = "3faf2a1e2e86cadc6bcc6082d63c73e8eafe6b703a0c5723e585b3d4afcec9cd"
 dependencies = [
+ "proc-macro-error",
  "proc-macro2",
  "quote",
  "syn",
@@ -3988,6 +4035,30 @@ dependencies = [
  "toml",
 ]
 
+[[package]]
+name = "proc-macro-error"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "version_check 0.9.2",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "version_check 0.9.2",
+]
+
 [[package]]
 name = "proc-macro-hack"
 version = "0.5.19"
@@ -4002,9 +4073,9 @@ checksum = "eba180dafb9038b050a4c280019bbedf9f2467b61e5d892dcad585bb57aadc5a"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.24"
+version = "1.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71"
+checksum = "a152013215dca273577e18d2bf00fa862b89b24169fb78c4c95aeb07992c9cec"
 dependencies = [
  "unicode-xid",
 ]
@@ -4214,7 +4285,7 @@ checksum = "7b94c6247d45d78d24481a5b7aca146f414ec0f5e39e175f294d1876b943eeeb"
 dependencies = [
  "async-trait",
  "bytes 0.5.6",
- "combine",
+ "combine 4.4.0",
  "dtoa",
  "futures-util",
  "itoa",
@@ -4952,6 +5023,15 @@ version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7acad6f34eb9e8a259d3283d1e8c1d34d7415943d4895f65cc73813c7396fc85"
 
+[[package]]
+name = "smartstring"
+version = "0.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ada87540bf8ef4cf8a1789deb175626829bb59b1fefd816cf7f7f55efcdbae9"
+dependencies = [
+ "static_assertions 1.1.0",
+]
+
 [[package]]
 name = "socket2"
 version = "0.3.17"
@@ -5225,9 +5305,9 @@ checksum = "343f3f510c2915908f155e94f17220b19ccfacf2a64a2a5d8004f2c3e311e7fd"
 
 [[package]]
 name = "syn"
-version = "1.0.53"
+version = "1.0.70"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8833e20724c24de12bbaba5ad230ea61c3eafb05b881c7c9d3cfe8638b187e68"
+checksum = "b9505f307c872bab8eb46f77ae357c8eba1fdacead58ee5a850116b1d7f82883"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -5930,6 +6010,15 @@ dependencies = [
  "env_logger 0.8.2",
 ]
 
+[[package]]
+name = "unreachable"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
+dependencies = [
+ "void",
+]
+
 [[package]]
 name = "untrusted"
 version = "0.7.1"
@@ -5963,12 +6052,6 @@ dependencies = [
  "cfg-if 0.1.10",
 ]
 
-[[package]]
-name = "uuid"
-version = "0.7.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90dbc611eb48397705a6b0f6e917da23ae517e4d127123d2cf7674206627d32a"
-
 [[package]]
 name = "uuid"
 version = "0.8.1"
diff --git a/graphql/juniper-advanced/Cargo.toml b/graphql/juniper-advanced/Cargo.toml
index 0098539..9ad49a1 100644
--- a/graphql/juniper-advanced/Cargo.toml
+++ b/graphql/juniper-advanced/Cargo.toml
@@ -9,7 +9,7 @@ edition = "2018"
 [dependencies]
 actix-web = "3"
 
-juniper = "0.14"
+juniper = "0.15"
 
 mysql = "17"
 r2d2 = "0.8"
diff --git a/graphql/juniper-advanced/README.md b/graphql/juniper-advanced/README.md
index 9314608..a41b1e7 100644
--- a/graphql/juniper-advanced/README.md
+++ b/graphql/juniper-advanced/README.md
@@ -2,18 +2,18 @@
 
 GraphQL Implementation in Rust using Actix, Juniper, and Mysql as Database
 
-# Prerequites
+## Prerequisites
+
 - Rust Installed
 - MySql as Database
 
-# Database Configuration
+## Database Configuration
 
 Create a new database for this project, and import the existing database schema has been provided named ```mysql-schema.sql```.
 
 Create ```.env``` file on the root directory of this project and set environment variable named ```DATABASE_URL```, the example file has been provided named ```.env.example```, you can see the format on there.
 
-# Run
-
+## Run
 
 ```sh
 # go to the root dir
@@ -23,6 +23,6 @@ cd juniper-advanced
 cargo run
 ```
 
-### GraphQL Playground
+## GraphQL Playground
 
-http://127.0.0.1:8080/graphiql
+<http://127.0.0.1:8080/graphiql>
diff --git a/graphql/juniper-advanced/src/handlers.rs b/graphql/juniper-advanced/src/handlers.rs
index 5ac2a29..0177f8e 100644
--- a/graphql/juniper-advanced/src/handlers.rs
+++ b/graphql/juniper-advanced/src/handlers.rs
@@ -14,7 +14,7 @@ pub async fn graphql(
         dbpool: pool.get_ref().to_owned(),
     };
     let res = web::block(move || {
-        let res = data.execute(&schema, &ctx);
+        let res = data.execute_sync(&schema, &ctx);
         Ok::<_, serde_json::error::Error>(serde_json::to_string(&res)?)
     })
     .await
@@ -28,7 +28,7 @@ pub async fn graphql(
 pub async fn graphql_playground() -> HttpResponse {
     HttpResponse::Ok()
         .content_type("text/html; charset=utf-8")
-        .body(graphiql_source("/graphql"))
+        .body(graphiql_source("/graphql", None))
 }
 
 pub fn register(config: &mut web::ServiceConfig) {
diff --git a/graphql/juniper-advanced/src/schemas/product.rs b/graphql/juniper-advanced/src/schemas/product.rs
index 9304ff3..47a79aa 100644
--- a/graphql/juniper-advanced/src/schemas/product.rs
+++ b/graphql/juniper-advanced/src/schemas/product.rs
@@ -12,7 +12,7 @@ pub struct Product {
     pub price: f64,
 }
 
-#[juniper::object(Context = Context)]
+#[juniper::graphql_object(Context = Context)]
 impl Product {
     fn id(&self) -> &str {
         &self.id
@@ -33,7 +33,7 @@ impl Product {
             "SELECT * FROM user WHERE id=:id",
             params! {"id" => &self.user_id},
         );
-        if let Err(err) = user {
+        if let Err(_err) = user {
             None
         } else {
             let (id, name, email) = from_row(user.unwrap().unwrap());
diff --git a/graphql/juniper-advanced/src/schemas/root.rs b/graphql/juniper-advanced/src/schemas/root.rs
index 051ef49..8302fb2 100644
--- a/graphql/juniper-advanced/src/schemas/root.rs
+++ b/graphql/juniper-advanced/src/schemas/root.rs
@@ -1,4 +1,4 @@
-use juniper::{FieldError, FieldResult, RootNode};
+use juniper::{EmptySubscription, FieldError, FieldResult, RootNode};
 use mysql::{from_row, params, Error as DBError, Row};
 
 use crate::db::Pool;
@@ -14,7 +14,7 @@ impl juniper::Context for Context {}
 
 pub struct QueryRoot;
 
-#[juniper::object(Context = Context)]
+#[juniper::graphql_object(Context = Context)]
 impl QueryRoot {
     #[graphql(description = "List of all users")]
     fn users(context: &Context) -> FieldResult<Vec<User>> {
@@ -24,7 +24,7 @@ impl QueryRoot {
             .map(|result| {
                 result
                     .map(|x| x.unwrap())
-                    .map(|mut row| {
+                    .map(|row| {
                         let (id, name, email) = from_row(row);
                         User { id, name, email }
                     })
@@ -41,7 +41,7 @@ impl QueryRoot {
         let user: Result<Option<Row>, DBError> =
             conn.first_exec("SELECT * FROM user WHERE id=:id", params! {"id" => id});
 
-        if let Err(err) = user {
+        if let Err(_err) = user {
             return Err(FieldError::new(
                 "User Not Found",
                 graphql_value!({ "not_found": "user not found" }),
@@ -60,7 +60,7 @@ impl QueryRoot {
             .map(|result| {
                 result
                     .map(|x| x.unwrap())
-                    .map(|mut row| {
+                    .map(|row| {
                         let (id, user_id, name, price) = from_row(row);
                         Product {
                             id,
@@ -80,7 +80,7 @@ impl QueryRoot {
         let mut conn = context.dbpool.get().unwrap();
         let product: Result<Option<Row>, DBError> =
             conn.first_exec("SELECT * FROM user WHERE id=:id", params! {"id" => id});
-        if let Err(err) = product {
+        if let Err(_err) = product {
             return Err(FieldError::new(
                 "Product Not Found",
                 graphql_value!({ "not_found": "product not found" }),
@@ -99,7 +99,7 @@ impl QueryRoot {
 
 pub struct MutationRoot;
 
-#[juniper::object(Context = Context)]
+#[juniper::graphql_object(Context = Context)]
 impl MutationRoot {
     fn create_user(context: &Context, user: UserInput) -> FieldResult<User> {
         let mut conn = context.dbpool.get().unwrap();
@@ -115,7 +115,7 @@ impl MutationRoot {
         );
 
         match insert {
-            Ok(opt_row) => Ok(User {
+            Ok(_opt_row) => Ok(User {
                 id: new_id,
                 name: user.name,
                 email: user.email,
@@ -148,7 +148,7 @@ impl MutationRoot {
         );
 
         match insert {
-            Ok(opt_row) => Ok(Product {
+            Ok(_opt_row) => Ok(Product {
                 id: new_id,
                 user_id: product.user_id,
                 name: product.name,
@@ -168,8 +168,8 @@ impl MutationRoot {
     }
 }
 
-pub type Schema = RootNode<'static, QueryRoot, MutationRoot>;
+pub type Schema = RootNode<'static, QueryRoot, MutationRoot, EmptySubscription<Context>>;
 
 pub fn create_schema() -> Schema {
-    Schema::new(QueryRoot, MutationRoot)
+    Schema::new(QueryRoot, MutationRoot, EmptySubscription::new())
 }
diff --git a/graphql/juniper-advanced/src/schemas/user.rs b/graphql/juniper-advanced/src/schemas/user.rs
index d17e293..0776c0a 100644
--- a/graphql/juniper-advanced/src/schemas/user.rs
+++ b/graphql/juniper-advanced/src/schemas/user.rs
@@ -18,7 +18,7 @@ pub struct UserInput {
     pub email: String,
 }
 
-#[juniper::object(Context = Context)]
+#[juniper::graphql_object(Context = Context)]
 impl User {
     fn id(&self) -> &str {
         &self.id
@@ -42,7 +42,7 @@ impl User {
         .map(|result| {
             result
                 .map(|x| x.unwrap())
-                .map(|mut row| {
+                .map(|row| {
                     let (id, user_id, name, price) = from_row(row);
                     Product {
                         id,
diff --git a/graphql/juniper/Cargo.toml b/graphql/juniper/Cargo.toml
index b2477c4..f5dacf4 100644
--- a/graphql/juniper/Cargo.toml
+++ b/graphql/juniper/Cargo.toml
@@ -11,4 +11,4 @@ env_logger = "0.8"
 serde = "1.0.103"
 serde_json = "1.0.44"
 serde_derive = "1.0.103"
-juniper = "0.14.2"
+juniper = "0.15"
diff --git a/graphql/juniper/README.md b/graphql/juniper/README.md
index c61b9b1..eb075e6 100644
--- a/graphql/juniper/README.md
+++ b/graphql/juniper/README.md
@@ -20,6 +20,7 @@ cargo run (or ``cargo watch -x run``)
 [http://127.0.0.1:8080/graphiql](http://127.0.0.1:8080/graphiql)
 
 _Query example:_
+
 ```graphql
 {
   human(id: "1234") {
@@ -29,7 +30,9 @@ _Query example:_
   }
 }
 ```
+
 _Result:_
+
 ```json
 {
   "data": {
@@ -58,6 +61,7 @@ mutation {
 ```
 
 _Result:_
+
 ```json
 {
   "data": {
diff --git a/graphql/juniper/src/main.rs b/graphql/juniper/src/main.rs
index ad4c664..4a790e2 100644
--- a/graphql/juniper/src/main.rs
+++ b/graphql/juniper/src/main.rs
@@ -14,7 +14,7 @@ mod schema;
 use crate::schema::{create_schema, Schema};
 
 async fn graphiql() -> HttpResponse {
-    let html = graphiql_source("http://127.0.0.1:8080/graphql");
+    let html = graphiql_source("http://127.0.0.1:8080/graphql", None);
     HttpResponse::Ok()
         .content_type("text/html; charset=utf-8")
         .body(html)
@@ -25,7 +25,7 @@ async fn graphql(
     data: web::Json<GraphQLRequest>,
 ) -> Result<HttpResponse, Error> {
     let user = web::block(move || {
-        let res = data.execute(&st, &());
+        let res = data.execute_sync(&st, &());
         Ok::<_, serde_json::error::Error>(serde_json::to_string(&res)?)
     })
     .await?;
diff --git a/graphql/juniper/src/schema.rs b/graphql/juniper/src/schema.rs
index cbec139..8200d60 100644
--- a/graphql/juniper/src/schema.rs
+++ b/graphql/juniper/src/schema.rs
@@ -1,5 +1,5 @@
 use juniper::FieldResult;
-use juniper::RootNode;
+use juniper::{EmptySubscription, RootNode};
 
 #[derive(GraphQLEnum)]
 enum Episode {
@@ -29,9 +29,9 @@ struct NewHuman {
 
 pub struct QueryRoot;
 
-#[juniper::object]
+#[juniper::graphql_object]
 impl QueryRoot {
-    fn human(id: String) -> FieldResult<Human> {
+    fn human(_id: String) -> FieldResult<Human> {
         Ok(Human {
             id: "1234".to_owned(),
             name: "Luke".to_owned(),
@@ -43,7 +43,7 @@ impl QueryRoot {
 
 pub struct MutationRoot;
 
-#[juniper::object]
+#[juniper::graphql_object]
 impl MutationRoot {
     fn create_human(new_human: NewHuman) -> FieldResult<Human> {
         Ok(Human {
@@ -55,8 +55,8 @@ impl MutationRoot {
     }
 }
 
-pub type Schema = RootNode<'static, QueryRoot, MutationRoot>;
+pub type Schema = RootNode<'static, QueryRoot, MutationRoot, EmptySubscription>;
 
 pub fn create_schema() -> Schema {
-    Schema::new(QueryRoot {}, MutationRoot {})
+    Schema::new(QueryRoot {}, MutationRoot {}, EmptySubscription::new())
 }