diff --git a/Cargo.toml b/Cargo.toml
index 35a885f..4ab4671 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,7 @@
 [workspace]
 
+resolver = "2"
+
 members = [
     "fake-tcp",
     "phantun",
diff --git a/fake-tcp/Cargo.toml b/fake-tcp/Cargo.toml
index 00e8ab9..147c6ce 100644
--- a/fake-tcp/Cargo.toml
+++ b/fake-tcp/Cargo.toml
@@ -16,7 +16,7 @@ benchmark = []
 
 [dependencies]
 bytes = "1"
-pnet = "0.33"
+pnet = "0.34"
 tokio = { version = "1.14", features = ["full"] }
 rand = { version = "0.8", features = ["small_rng"] }
 log = "0.4"
diff --git a/fake-tcp/src/lib.rs b/fake-tcp/src/lib.rs
index a5c5863..a66da47 100644
--- a/fake-tcp/src/lib.rs
+++ b/fake-tcp/src/lib.rs
@@ -146,7 +146,7 @@ impl Socket {
         )
     }
 
-    fn build_tcp_packet(&self, flags: u16, payload: Option<&[u8]>) -> Bytes {
+    fn build_tcp_packet(&self, flags: u8, payload: Option<&[u8]>) -> Bytes {
         let ack = self.ack.load(Ordering::Relaxed);
         self.last_ack.store(ack, Ordering::Relaxed);
 
diff --git a/fake-tcp/src/packet.rs b/fake-tcp/src/packet.rs
index c2abe56..349ffb7 100644
--- a/fake-tcp/src/packet.rs
+++ b/fake-tcp/src/packet.rs
@@ -36,7 +36,7 @@ pub fn build_tcp_packet(
     remote_addr: SocketAddr,
     seq: u32,
     ack: u32,
-    flags: u16,
+    flags: u8,
     payload: Option<&[u8]>,
 ) -> Bytes {
     let ip_header_len = match local_addr {