diff --git a/Cargo.lock b/Cargo.lock
index cf9c09a3138..fdeada37500 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3293,7 +3293,7 @@ dependencies = [
 
 [[package]]
 name = "libp2p-webtransport-websys"
-version = "0.5.1"
+version = "0.5.2"
 dependencies = [
  "futures",
  "js-sys",
diff --git a/Cargo.toml b/Cargo.toml
index 6557a33b025..9e65d1ab62f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -114,7 +114,7 @@ libp2p-webrtc-utils = { version = "0.4.0", path = "misc/webrtc-utils" }
 libp2p-webrtc-websys = { version = "0.4.0", path = "transports/webrtc-websys" }
 libp2p-websocket = { version = "0.45.2", path = "transports/websocket" }
 libp2p-websocket-websys = { version = "0.5.0", path = "transports/websocket-websys" }
-libp2p-webtransport-websys = { version = "0.5.1", path = "transports/webtransport-websys" }
+libp2p-webtransport-websys = { version = "0.5.2", path = "transports/webtransport-websys" }
 libp2p-yamux = { version = "0.47.0", path = "muxers/yamux" }
 
 # External dependencies
diff --git a/transports/webtransport-websys/CHANGELOG.md b/transports/webtransport-websys/CHANGELOG.md
index e455e5ec6c3..e94220bc23e 100644
--- a/transports/webtransport-websys/CHANGELOG.md
+++ b/transports/webtransport-websys/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.5.2
+
+- Remove `poll_flush called after poll_close` assertion.
+  See [PR 6193](https://github.com/libp2p/rust-libp2p/pull/6193).
+
 ## 0.5.1
 
 - Remove `once_cell` dependency.
diff --git a/transports/webtransport-websys/Cargo.toml b/transports/webtransport-websys/Cargo.toml
index e577ea74896..bcdf317a3ae 100644
--- a/transports/webtransport-websys/Cargo.toml
+++ b/transports/webtransport-websys/Cargo.toml
@@ -3,7 +3,7 @@ name = "libp2p-webtransport-websys"
 edition.workspace = true
 rust-version = { workspace = true }
 description = "WebTransport for libp2p under WASM environment"
-version = "0.5.1"
+version = "0.5.2"
 authors = [
     "Yiannis Marangos <yiannis@eiger.co>",
     "oblique <psyberbits@gmail.com>",
diff --git a/transports/webtransport-websys/src/stream.rs b/transports/webtransport-websys/src/stream.rs
index b9d1669b6dc..18de06e3d8f 100644
--- a/transports/webtransport-websys/src/stream.rs
+++ b/transports/webtransport-websys/src/stream.rs
@@ -153,10 +153,6 @@ impl StreamInner {
             // messages were flushed.
             self.poll_writer_ready(cx)
         } else {
-            debug_assert!(
-                false,
-                "libp2p_webtransport_websys::Stream: poll_flush called after poll_close"
-            );
             Poll::Ready(Ok(()))
         }
     }