diff --git a/src/main.rs b/src/main.rs
index 112d487..fc26503 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,19 +11,21 @@ async fn main() {
 
     // Manually set an option.
     client_options.app_name = Some("My App".to_string());
-    client_options.credential = Some(Credential::default());
-    client_options.credential.as_mut().unwrap().username = Some(std::env::var("mongo_username").unwrap());
-    client_options.credential.as_mut().unwrap().password = Some(std::env::var("mongo_password").unwrap());
+
+    let credential_builder = Credential::builder()
+                            .username(Some(std::env::var("mongo_username").unwrap()))
+                            .password(Some(std::env::var("mongo_password").unwrap()));
+
+    client_options.credential = Some(credential_builder.build());
     
     // Get a handle to the deployment.
     let client = Client::with_options(client_options).unwrap();
-
     let db = client.database("test");
-    
     match db.create_collection("test", None).await {
         Err(_) => panic!("ERROR: incorrect usage"),
         _ => {}
-    } 
+    }
+    
     let collection = db.collection::<Packet>("test");
 
     loop {
diff --git a/src/test.json b/src/test.json
deleted file mode 100644
index 4bfdb82..0000000
--- a/src/test.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-    "id": 1,
-    "first_name": "Tom",
-    "last_name": "Cruise",
-    "photo": "https://jsonformatter.org/img/tom-cruise.jpg"
-},
-{
-    "id": 2,
-    "first_name": "Maria",
-    "last_name": "Sharapova",
-    "photo": "https://jsonformatter.org/img/Maria-Sharapova.jpg
-    "
-},
-{
-    "id": 3,
-    "first_name": "Robert",
-    "last_name": "Downey Jr",
-    "photo": "https://jsonformatter.org/img/Robert-Downey-Jr.jpg"
-}
\ No newline at end of file