diff --git a/CHANGES.md b/CHANGES.md
index 9ad7f79..78a84fe 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,9 @@
 # Changes
 
+## [4.3.1] - 2024-11-05
+
+* Do not rely on not_ready(), always check service readiness
+
 ## [4.3.0] - 2024-11-04
 
 * Use updated Service trait
diff --git a/Cargo.toml b/Cargo.toml
index 8e7bb0b..b5b9172 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ntex-mqtt"
-version = "4.3.0"
+version = "4.3.1"
 authors = ["ntex contributors <team@ntex.rs>"]
 description = "Client and Server framework for MQTT v5 and v3.1.1 protocols"
 documentation = "https://docs.rs/ntex-mqtt"
diff --git a/src/io.rs b/src/io.rs
index 3c9de34..271779d 100644
--- a/src/io.rs
+++ b/src/io.rs
@@ -11,8 +11,6 @@ use ntex_util::time::Seconds;
 
 type Response<U> = <U as Encoder>::Item;
 
-const READY_COUNT: u8 = 32;
-
 pin_project_lite::pin_project! {
     /// Dispatcher for mqtt protocol
     pub(crate) struct Dispatcher<S, U>
@@ -52,7 +50,6 @@ struct DispatcherInner<S: Service<DispatchItem<U>>, U: Encoder + Decoder + 'stat
     read_max_timeout: Seconds,
     keepalive_timeout: Seconds,
 
-    ready_count: u8,
     response: Option<PipelineCall<S, DispatchItem<U>>>,
     response_idx: usize,
 }
@@ -142,7 +139,6 @@ where
                 st: IoDispatcherState::Processing,
                 response: None,
                 response_idx: 0,
-                ready_count: 0,
                 read_remains: 0,
                 read_remains_prev: 0,
                 read_max_timeout: Seconds::ZERO,
@@ -452,19 +448,9 @@ where
     }
 
     fn poll_service(&mut self, cx: &mut Context<'_>) -> Poll<PollService<U>> {
-        // check service readiness
-        if self.flags.contains(Flags::READY) {
-            if self.ready_count != 0 && self.service.poll_not_ready(cx).is_pending() {
-                self.ready_count -= 1;
-                return Poll::Ready(self.check_error());
-            }
-            self.flags.remove(Flags::READY);
-        }
-
         match self.service.poll_ready(cx) {
             Poll::Ready(Ok(_)) => {
-                self.ready_count = READY_COUNT;
-                self.flags.insert(Flags::READY);
+                let _ = self.service.poll_not_ready(cx);
                 Poll::Ready(self.check_error())
             }
             // pause io read task
@@ -646,7 +632,6 @@ mod tests {
                         service: Pipeline::new(service.into_service()).bind(),
                         response: None,
                         response_idx: 0,
-                        ready_count: 0,
                         io: IoBoxed::from(io),
                         st: IoDispatcherState::Processing,
                         flags: if keepalive_timeout.is_zero() {