diff --git a/examples/reply/Cargo.toml b/examples/reply/Cargo.toml
index 5e01705..713e832 100644
--- a/examples/reply/Cargo.toml
+++ b/examples/reply/Cargo.toml
@@ -8,5 +8,4 @@ publish = false
 safe-vk = { path = "../../safe-vk", features = ["macros"] }
 serde_json = "1.0.117"
 serde = "1.0.203"
-rand = { version = "0.8.5", features = ["small_rng"] }
 tokio = { version = "1", features = ["full"] }
diff --git a/safe-vk/src/start_polling.rs b/safe-vk/src/start_polling.rs
index c7dfb05..a18678e 100644
--- a/safe-vk/src/start_polling.rs
+++ b/safe-vk/src/start_polling.rs
@@ -15,9 +15,8 @@ pub struct Polling<M, S> {
 
 pub fn start_polling<M, S>(token: &str, safevk: M) -> Polling<M, S>
 where
-    M: Service<(), Response = S>,
-    S: Service<Update, Response = ()> + Clone + Send + 'static,
-    S::Future: Send,
+    M: Service<Update, Response = ()> + Send + Clone + 'static,
+    <M as Service<Update>>::Future: Send,
 {
     let request = RequestBuilder::new(token);
     Polling {
@@ -29,10 +28,8 @@ where
 
 impl<M, S> IntoFuture for Polling<M, S>
 where
-    M: Service<(), Response = S> + Send + Clone + 'static + Service<Update>,
+    M: Service<Update, Response = S> + Send + Clone + 'static,
     <M as Service<Update>>::Future: Send,
-    S: Service<Update, Response = ()> + Clone + Send + 'static,
-    S::Future: Send,
 {
     type Output = Response<()>;
     type IntoFuture = PollFuture;
@@ -53,9 +50,7 @@ where
                     Ok(res) => {
                         if let Some(updates) = res.updates {
                             for event in updates {
-                                poll_fn(|cx| <M as Service<Update>>::poll_ready(&mut safevk, cx))
-                                    .await
-                                    .unwrap();
+                                poll_fn(|cx| safevk.poll_ready(cx)).await.unwrap();
 
                                 let request_clone = Arc::clone(&request);
                                 let mut safevk = safevk.clone();