diff --git a/Cargo.lock b/Cargo.lock
index b917d0a96e8..63994b8f8cf 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3300,7 +3300,7 @@ dependencies = [
 
 [[package]]
 name = "libp2p-swarm"
-version = "0.46.0"
+version = "0.46.1"
 dependencies = [
  "async-std",
  "criterion",
diff --git a/Cargo.toml b/Cargo.toml
index 0d1880eb2b1..8fca60b82a5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -99,7 +99,7 @@ libp2p-rendezvous = { version = "0.16.0", path = "protocols/rendezvous" }
 libp2p-request-response = { version = "0.28.1", path = "protocols/request-response" }
 libp2p-server = { version = "0.12.6", path = "misc/server" }
 libp2p-stream = { version = "0.3.0-alpha", path = "protocols/stream" }
-libp2p-swarm = { version = "0.46.0", path = "swarm" }
+libp2p-swarm = { version = "0.46.1", path = "swarm" }
 libp2p-swarm-derive = { version = "=0.35.1", path = "swarm-derive" } # `libp2p-swarm-derive` may not be compatible with different `libp2p-swarm` non-breaking releases. E.g. `libp2p-swarm` might introduce a new enum variant `FromSwarm` (which is `#[non-exhaustive]`) in a non-breaking release. Older versions of `libp2p-swarm-derive` would not forward this enum variant within the `NetworkBehaviour` hierarchy. Thus the version pinning is required.
 libp2p-swarm-test = { version = "0.5.0", path = "swarm-test" }
 libp2p-tcp = { version = "0.43.0", path = "transports/tcp" }
diff --git a/swarm/CHANGELOG.md b/swarm/CHANGELOG.md
index 70cf10b55e9..b8e7ac135e3 100644
--- a/swarm/CHANGELOG.md
+++ b/swarm/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.46.1
+- Undo `ConnectionHandler::{InboundOpenInfo, OutboundOpenInfo}` deprecation.
+  Substreams are not completely interchangeable and a certain Substream may be associated with a
+  certain upgrade.
+  See [PR 5860](https://github.com/libp2p/rust-libp2p/pull/5860).
+
 ## 0.46.0
 
 - Don't report `NewExternalAddrCandidate` for confirmed external addresses.
@@ -12,11 +18,11 @@
 - Update default for idle-connection-timeout to 10s.
   See [PR 4967](https://github.com/libp2p/rust-libp2p/pull/4967).
 
-- Deprecate `ConnectionHandler::{InboundOpenInfo, OutboundOpenInfo}` associated type.  
-  Previously, users could tag pending sub streams with custom data and retrieve the data 
+- Deprecate `ConnectionHandler::{InboundOpenInfo, OutboundOpenInfo}` associated type.
+  Previously, users could tag pending sub streams with custom data and retrieve the data
   after the substream has been negotiated.
-  But substreams themselves are completely interchangeable, users should instead track 
-  additional data inside `ConnectionHandler` after negotiation.   
+  But substreams themselves are completely interchangeable, users should instead track
+  additional data inside `ConnectionHandler` after negotiation.
   See [PR 5242](https://github.com/libp2p/rust-libp2p/pull/5242).
 
 <!-- Update to libp2p-core v0.43.0 -->
diff --git a/swarm/Cargo.toml b/swarm/Cargo.toml
index b3d2520f97c..17cc2e59cde 100644
--- a/swarm/Cargo.toml
+++ b/swarm/Cargo.toml
@@ -3,7 +3,7 @@ name = "libp2p-swarm"
 edition = "2021"
 rust-version = { workspace = true }
 description = "The libp2p swarm"
-version = "0.46.0"
+version = "0.46.1"
 authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT"
 repository = "https://github.com/libp2p/rust-libp2p"
diff --git a/swarm/src/behaviour/toggle.rs b/swarm/src/behaviour/toggle.rs
index a706187a40c..af2bbe981b7 100644
--- a/swarm/src/behaviour/toggle.rs
+++ b/swarm/src/behaviour/toggle.rs
@@ -200,7 +200,6 @@ impl<TInner> ToggleConnectionHandler<TInner>
 where
     TInner: ConnectionHandler,
 {
-    #[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
     fn on_fully_negotiated_inbound(
         &mut self,
         FullyNegotiatedInbound {
@@ -232,7 +231,6 @@ where
             panic!("Unexpected Either::Right in enabled `on_fully_negotiated_inbound`.")
         }
     }
-    #[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
     fn on_listen_upgrade_error(
         &mut self,
         ListenUpgradeError { info, error: err }: ListenUpgradeError<
@@ -268,7 +266,6 @@ where
     }
 }
 
-#[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
 impl<TInner> ConnectionHandler for ToggleConnectionHandler<TInner>
 where
     TInner: ConnectionHandler,
diff --git a/swarm/src/connection.rs b/swarm/src/connection.rs
index bf688f41f0d..a91cd07528b 100644
--- a/swarm/src/connection.rs
+++ b/swarm/src/connection.rs
@@ -123,7 +123,6 @@ where
     /// The underlying handler.
     handler: THandler,
     /// Futures that upgrade incoming substreams.
-    #[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
     negotiating_in: FuturesUnordered<
         StreamUpgrade<
             THandler::InboundOpenInfo,
@@ -132,7 +131,6 @@ where
         >,
     >,
     /// Futures that upgrade outgoing substreams.
-    #[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
     negotiating_out: FuturesUnordered<
         StreamUpgrade<
             THandler::OutboundOpenInfo,
@@ -157,7 +155,6 @@ where
     ///
     /// The upgrade timeout is already ticking here so this may fail in case the remote is not
     /// quick enough in providing us with a new stream.
-    #[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
     requested_substreams: FuturesUnordered<
         SubstreamRequested<THandler::OutboundOpenInfo, THandler::OutboundProtocol>,
     >,
@@ -171,7 +168,6 @@ where
     stream_counter: ActiveStreamCounter,
 }
 
-#[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
 impl<THandler> fmt::Debug for Connection<THandler>
 where
     THandler: ConnectionHandler + fmt::Debug,
diff --git a/swarm/src/connection/pool.rs b/swarm/src/connection/pool.rs
index f21a7307105..49cc774b2b7 100644
--- a/swarm/src/connection/pool.rs
+++ b/swarm/src/connection/pool.rs
@@ -553,7 +553,6 @@ where
 
     /// Polls the connection pool for events.
     #[tracing::instrument(level = "debug", name = "Pool::poll", skip(self, cx))]
-    #[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
     pub(crate) fn poll(&mut self, cx: &mut Context<'_>) -> Poll<PoolEvent<THandler::ToBehaviour>>
     where
         THandler: ConnectionHandler + 'static,
diff --git a/swarm/src/handler.rs b/swarm/src/handler.rs
index 2eb128d173b..0e4d1f5a325 100644
--- a/swarm/src/handler.rs
+++ b/swarm/src/handler.rs
@@ -98,7 +98,6 @@ use crate::{connection::AsStrHashEq, StreamProtocol};
 /// Implementers of this trait should keep in mind that the connection can be closed at any time.
 /// When a connection is closed gracefully, the substreams used by the handler may still
 /// continue reading data until the remote closes its side of the connection.
-#[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
 pub trait ConnectionHandler: Send + 'static {
     /// A type representing the message(s) a
     /// [`NetworkBehaviour`](crate::behaviour::NetworkBehaviour) can send to a [`ConnectionHandler`]
@@ -113,10 +112,8 @@ pub trait ConnectionHandler: Send + 'static {
     /// The outbound upgrade for the protocol(s) used by the handler.
     type OutboundProtocol: OutboundUpgradeSend;
     /// The type of additional information returned from `listen_protocol`.
-    #[deprecated = "Track data in ConnectionHandler instead."]
     type InboundOpenInfo: Send + 'static;
     /// The type of additional information passed to an `OutboundSubstreamRequest`.
-    #[deprecated = "Track data in ConnectionHandler instead."]
     type OutboundOpenInfo: Send + 'static;
 
     /// The [`InboundUpgrade`](libp2p_core::upgrade::InboundUpgrade) to apply on inbound
diff --git a/swarm/src/handler/either.rs b/swarm/src/handler/either.rs
index a349726f454..1dc62e0eb2a 100644
--- a/swarm/src/handler/either.rs
+++ b/swarm/src/handler/either.rs
@@ -77,7 +77,6 @@ where
 
 /// Implementation of a [`ConnectionHandler`] that represents either of two [`ConnectionHandler`]
 /// implementations.
-#[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
 impl<L, R> ConnectionHandler for Either<L, R>
 where
     L: ConnectionHandler,
diff --git a/swarm/src/handler/map_in.rs b/swarm/src/handler/map_in.rs
index 7a5166cab75..55885b351bb 100644
--- a/swarm/src/handler/map_in.rs
+++ b/swarm/src/handler/map_in.rs
@@ -47,7 +47,6 @@ impl<TConnectionHandler, TMap, TNewIn> MapInEvent<TConnectionHandler, TNewIn, TM
     }
 }
 
-#[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
 impl<TConnectionHandler, TMap, TNewIn> ConnectionHandler
     for MapInEvent<TConnectionHandler, TNewIn, TMap>
 where
diff --git a/swarm/src/handler/map_out.rs b/swarm/src/handler/map_out.rs
index 9bb0e2bc554..6d05551aeec 100644
--- a/swarm/src/handler/map_out.rs
+++ b/swarm/src/handler/map_out.rs
@@ -43,7 +43,6 @@ impl<TConnectionHandler, TMap> MapOutEvent<TConnectionHandler, TMap> {
     }
 }
 
-#[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
 impl<TConnectionHandler, TMap, TNewOut> ConnectionHandler for MapOutEvent<TConnectionHandler, TMap>
 where
     TConnectionHandler: ConnectionHandler,
diff --git a/swarm/src/handler/multi.rs b/swarm/src/handler/multi.rs
index 4f4d64f65fe..73af1b1109e 100644
--- a/swarm/src/handler/multi.rs
+++ b/swarm/src/handler/multi.rs
@@ -86,7 +86,6 @@ where
         Ok(m)
     }
 
-    #[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
     fn on_listen_upgrade_error(
         &mut self,
         ListenUpgradeError {
@@ -108,7 +107,6 @@ where
     }
 }
 
-#[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
 impl<K, H> ConnectionHandler for MultiHandler<K, H>
 where
     K: Clone + Debug + Hash + Eq + Send + 'static,
diff --git a/swarm/src/handler/select.rs b/swarm/src/handler/select.rs
index f4c926f1a0e..0f6dbe988ff 100644
--- a/swarm/src/handler/select.rs
+++ b/swarm/src/handler/select.rs
@@ -152,7 +152,6 @@ where
     TProto1: ConnectionHandler,
     TProto2: ConnectionHandler,
 {
-    #[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
     fn on_listen_upgrade_error(
         &mut self,
         ListenUpgradeError {
@@ -182,7 +181,6 @@ where
     }
 }
 
-#[expect(deprecated)] // TODO: Remove when {In, Out}boundOpenInfo is fully removed.
 impl<TProto1, TProto2> ConnectionHandler for ConnectionHandlerSelect<TProto1, TProto2>
 where
     TProto1: ConnectionHandler,