diff --git a/.github/mergify.yml b/.github/mergify.yml
index 38f025c7814..316be305382 100644
--- a/.github/mergify.yml
+++ b/.github/mergify.yml
@@ -1,57 +1,17 @@
-defaults:
-  actions:
-    queue:
-      method: squash
-      commit_message_template: |
-        {{ title }}
-
-        {{ body | get_section("## Description", "") }}
-
-        Pull-Request: #{{ number }}.
-
-        {{ body | get_section("## Attributions", "") }}
-
 pull_request_rules:
   - name: Ask to resolve conflict
     conditions:
       - conflict
       - -author=dependabot[bot]
       - or:
-        - -draft # Don't report conflicts on regular draft.
-        - and: # Do report conflicts on draft that are scheduled for the next major release.
-          - draft
-          - milestone~=v[0-9]\.[0-9]{2}
+          - -draft # Don't report conflicts on regular draft.
+          - and: # Do report conflicts on draft that are scheduled for the next major release.
+              - draft
+              - milestone~=v[0-9]\.[0-9]{2}
     actions:
       comment:
-        message: This pull request has merge conflicts. Could you please resolve them @{{author}}? 🙏
-
-  - name: Add to merge queue
-    conditions:
-      # All branch protection rules are implicit: https://docs.mergify.com/conditions/#about-branch-protection
-      - label=send-it
-      - base=master
-    actions:
-      queue:
-        name: default
-
-  # Adds the Pr to the batch queue, so that we can run the interop tests. See the `external_prs` queue for more info.
-  - name: Add to batch merge queue
-    conditions:
-      # All branch protection rules are implicit: https://docs.mergify.com/conditions/#about-branch-protection
-      - label=send-it-batch
-      - base=master
-    actions:
-      queue:
-        name: external_prs
-
-  - name: Add approved dependabot PRs to merge queue
-    conditions:
-      # All branch protection rules are implicit: https://docs.mergify.com/conditions/#about-branch-protection
-      - author=dependabot[bot]
-      - base=master
-    actions:
-      queue:
-        name: default
+        message: This pull request has merge conflicts. Could you please resolve them
+          @{{author}}? 🙏
 
   - name: Remove reviews on updates after PR is queued for merging
     conditions:
@@ -61,7 +21,8 @@ pull_request_rules:
       - author!=dependabot[bot]
     actions:
       dismiss_reviews:
-        message: Approvals have been dismissed because the PR was updated after the `send-it` label was applied.
+        message: Approvals have been dismissed because the PR was updated after the
+          `send-it` label was applied.
         changes_requested: false
 
   - name: Approve trivial maintainer PRs
@@ -83,11 +44,34 @@ pull_request_rules:
       review:
         type: APPROVE
 
+  - name: Add approved dependabot PRs to merge queue
+    conditions:
+      # All branch protection rules are implicit: https://docs.mergify.com/conditions/#about-branch-protection
+      - author=dependabot[bot]
+      - base=master
+    actions:
+      queue:
+
+  - name: Add send-it labeled PRs to merge queue
+    conditions:
+      # All branch protection rules are implicit: https://docs.mergify.com/conditions/#about-branch-protection
+      - base=master
+      - label=send-it
+    actions:
+      queue:
+
 queue_rules:
-  - name: default
-    conditions: []
-  # External PR's don't have access to secrets and variables, therefore they don't run the interop tests.
-  # using a batch queue allows to circumvent that as mergify creates it from an internal branch.
-  - name: external_prs
-    conditions: []
-    batch_size: 1
+  - name: default merge queue
+    queue_conditions:
+      - label=send-it
+      - base=master
+    merge_conditions: []
+    merge_method: squash
+    commit_message_template: |
+      {{ title }}
+
+      {{ body | get_section("## Description", "") }}
+
+      Pull-Request: #{{ number }}.
+
+      {{ body | get_section("## Attributions", "") }}
diff --git a/Cargo.lock b/Cargo.lock
index 60724c1b855..bb8aa3c7f74 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3359,7 +3359,7 @@ dependencies = [
 
 [[package]]
 name = "libp2p-tcp"
-version = "0.42.0"
+version = "0.42.1"
 dependencies = [
  "async-io",
  "async-std",
diff --git a/Cargo.toml b/Cargo.toml
index e5d4b2353e1..253f2973b5b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -103,7 +103,7 @@ libp2p-stream = { version = "0.2.0-alpha.1", path = "protocols/stream" }
 libp2p-swarm = { version = "0.45.2", path = "swarm" }
 libp2p-swarm-derive = { version = "=0.35.0", 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 = "0.42.0", path = "transports/tcp" }
+libp2p-tcp = { version = "0.42.1", path = "transports/tcp" }
 libp2p-tls = { version = "0.5.0", path = "transports/tls" }
 libp2p-uds = { version = "0.41.0", path = "transports/uds" }
 libp2p-upnp = { version = "0.3.1", path = "protocols/upnp" }
@@ -124,6 +124,7 @@ futures = "0.3.30"
 futures-bounded = { version = "0.2.4" }
 futures-rustls = { version = "0.26.0", default-features = false }
 getrandom = "0.2"
+if-watch = "3.2.1"
 hickory-proto = { version = "0.25.0-alpha.4", default-features = false }
 hickory-resolver = { version = "0.25.0-alpha.4", default-features = false }
 multiaddr = "0.18.1"
diff --git a/interop-tests/Dockerfile.chromium b/interop-tests/Dockerfile.chromium
index 4ccb142b4a3..73a9ab82ee7 100644
--- a/interop-tests/Dockerfile.chromium
+++ b/interop-tests/Dockerfile.chromium
@@ -14,7 +14,7 @@ FROM chef AS builder
 COPY --from=planner /app/recipe.json recipe.json
 # Build dependencies - this is the caching Docker layer!
 RUN cargo chef cook --release --package interop-tests --target wasm32-unknown-unknown --recipe-path recipe.json
-RUN RUSTFLAGS='-C target-feature=+crt-static' cargo chef cook --release --package interop-tests --target x86_64-unknown-linux-gnu --bin wasm_ping --recipe-path recipe.json
+RUN cargo chef cook --release --package interop-tests --bin wasm_ping --recipe-path recipe.json
 # Build application
 COPY . .
 RUN wasm-pack build --target web interop-tests
diff --git a/interop-tests/Dockerfile.native b/interop-tests/Dockerfile.native
index f0b078d9492..fab50dc50ad 100644
--- a/interop-tests/Dockerfile.native
+++ b/interop-tests/Dockerfile.native
@@ -9,7 +9,7 @@ RUN cargo chef prepare --recipe-path recipe.json
 FROM chef AS builder
 COPY --from=planner /app/recipe.json recipe.json
 # Build dependencies - this is the caching Docker layer!
-RUN RUSTFLAGS='-C target-feature=+crt-static' cargo chef cook --release --package interop-tests --target $(rustc -vV | grep host | awk '{print $2}') --bin native_ping --recipe-path recipe.json
+RUN cargo chef cook --release --package interop-tests --bin native_ping --recipe-path recipe.json
 # Build application
 COPY . .
 RUN RUSTFLAGS='-C target-feature=+crt-static' cargo build --release --package interop-tests --target $(rustc -vV | grep host | awk '{print $2}') --bin native_ping
diff --git a/protocols/mdns/Cargo.toml b/protocols/mdns/Cargo.toml
index ba86a82d5bb..e8fee81e98d 100644
--- a/protocols/mdns/Cargo.toml
+++ b/protocols/mdns/Cargo.toml
@@ -14,7 +14,7 @@ categories = ["network-programming", "asynchronous"]
 async-std  = { version = "1.12.0", optional = true }
 async-io  = { version = "2.3.3", optional = true }
 futures = { workspace = true }
-if-watch = "3.2.0"
+if-watch = { workspace = true }
 libp2p-core = { workspace = true }
 libp2p-swarm = { workspace = true }
 libp2p-identity = { workspace = true }
diff --git a/transports/quic/Cargo.toml b/transports/quic/Cargo.toml
index 1c35b293049..c0d4f17a916 100644
--- a/transports/quic/Cargo.toml
+++ b/transports/quic/Cargo.toml
@@ -12,7 +12,7 @@ license = "MIT"
 async-std = { version = "1.12.0", optional = true }
 futures = { workspace = true }
 futures-timer = "3.0.3"
-if-watch = "3.2.0"
+if-watch = { workspace = true }
 libp2p-core = { workspace = true }
 libp2p-tls = { workspace = true }
 libp2p-identity = { workspace = true }
diff --git a/transports/tcp/CHANGELOG.md b/transports/tcp/CHANGELOG.md
index 107d0d13ece..6d9c51b45be 100644
--- a/transports/tcp/CHANGELOG.md
+++ b/transports/tcp/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 0.42.1
+
+- Fix the disabling of Nagle's algorithm, which requires setting `TCP_NODELAY` to _true_.
+  See [PR 5764](https://github.com/libp2p/rust-libp2p/pull/5764)
+
 ## 0.42.0
 
 - Implement refactored `Transport`.
diff --git a/transports/tcp/Cargo.toml b/transports/tcp/Cargo.toml
index 61c31e49639..73c25d85d48 100644
--- a/transports/tcp/Cargo.toml
+++ b/transports/tcp/Cargo.toml
@@ -3,7 +3,7 @@ name = "libp2p-tcp"
 edition = "2021"
 rust-version = { workspace = true }
 description = "TCP/IP transport protocol for libp2p"
-version = "0.42.0"
+version = "0.42.1"
 authors = ["Parity Technologies <admin@parity.io>"]
 license = "MIT"
 repository = "https://github.com/libp2p/rust-libp2p"
@@ -14,7 +14,7 @@ categories = ["network-programming", "asynchronous"]
 async-io = { version = "2.3.3", optional = true }
 futures = { workspace = true }
 futures-timer = "3.0"
-if-watch = "3.2.0"
+if-watch = { workspace = true }
 libc = "0.2.155"
 libp2p-core = { workspace = true }
 socket2 = { version = "0.5.7", features = ["all"] }
diff --git a/transports/tcp/src/lib.rs b/transports/tcp/src/lib.rs
index 5d3e46bcb09..07250f75655 100644
--- a/transports/tcp/src/lib.rs
+++ b/transports/tcp/src/lib.rs
@@ -59,8 +59,8 @@ use socket2::{Domain, Socket, Type};
 pub struct Config {
     /// TTL to set for opened sockets, or `None` to keep default.
     ttl: Option<u32>,
-    /// `TCP_NODELAY` to set for opened sockets, or `None` to keep default.
-    nodelay: Option<bool>,
+    /// `TCP_NODELAY` to set for opened sockets.
+    nodelay: bool,
     /// Size of the listen backlog for listen sockets.
     backlog: u32,
 }
@@ -130,7 +130,7 @@ impl PortReuse {
 impl Config {
     /// Creates a new configuration for a TCP/IP transport:
     ///
-    ///   * Nagle's algorithm, i.e. `TCP_NODELAY`, is _enabled_. See [`Config::nodelay`].
+    ///   * Nagle's algorithm is _disabled_, i.e. `TCP_NODELAY` _enabled_. See [`Config::nodelay`].
     ///   * Reuse of listening ports is _disabled_. See [`Config::port_reuse`].
     ///   * No custom `IP_TTL` is set. The default of the OS TCP stack applies. See [`Config::ttl`].
     ///   * The size of the listen backlog for new listening sockets is `1024`. See
@@ -138,7 +138,7 @@ impl Config {
     pub fn new() -> Self {
         Self {
             ttl: None,
-            nodelay: Some(false), // Disable Nagle's algorithm by default
+            nodelay: true, // Disable Nagle's algorithm by default.
             backlog: 1024,
         }
     }
@@ -151,7 +151,7 @@ impl Config {
 
     /// Configures the `TCP_NODELAY` option for new sockets.
     pub fn nodelay(mut self, value: bool) -> Self {
-        self.nodelay = Some(value);
+        self.nodelay = value;
         self
     }
 
@@ -198,9 +198,7 @@ impl Config {
         if let Some(ttl) = self.ttl {
             socket.set_ttl(ttl)?;
         }
-        if let Some(nodelay) = self.nodelay {
-            socket.set_nodelay(nodelay)?;
-        }
+        socket.set_nodelay(self.nodelay)?;
         socket.set_reuse_address(true)?;
         #[cfg(all(unix, not(any(target_os = "solaris", target_os = "illumos"))))]
         if port_use == PortUse::Reuse {
diff --git a/transports/webrtc/Cargo.toml b/transports/webrtc/Cargo.toml
index d43be5720d4..41dec91ba43 100644
--- a/transports/webrtc/Cargo.toml
+++ b/transports/webrtc/Cargo.toml
@@ -15,7 +15,7 @@ async-trait = "0.1"
 futures = { workspace = true }
 futures-timer = "3"
 hex = "0.4"
-if-watch = "3.2"
+if-watch = { workspace = true }
 libp2p-core = { workspace = true }
 libp2p-noise = { workspace = true }
 libp2p-identity = { workspace = true }