diff --git a/network/fuzz/Cargo.toml b/network/fuzz/Cargo.toml
index c04cc37762..f4eb181c01 100644
--- a/network/fuzz/Cargo.toml
+++ b/network/fuzz/Cargo.toml
@@ -13,7 +13,7 @@ cargo-fuzz = true
 
 [dependencies]
 libfuzzer-sys = "0.4"
-ipnetwork = "0.18"
+ipnetwork = "0.20.0"
 
 [dependencies.ckb-network]
 path = ".."
diff --git a/network/fuzz/fuzz_targets/fuzz_addr_manager.rs b/network/fuzz/fuzz_targets/fuzz_addr_manager.rs
index f4665c0512..d788ae9bfa 100644
--- a/network/fuzz/fuzz_targets/fuzz_addr_manager.rs
+++ b/network/fuzz/fuzz_targets/fuzz_addr_manager.rs
@@ -20,7 +20,7 @@ fn new_addr(data: &[u8], index: usize) -> AddrInfo {
     // let ip = Ipv4Addr::from(((225 << 24) + index) as u32);
     // let port = u16::from_le_bytes(data[4..6].try_into().unwrap());
     let peer_id =
-        PeerId::from_bytes(vec![vec![0x12], vec![0x20], data[4..].to_vec()].concat()).unwrap();
+        PeerId::from_bytes([vec![0x12], vec![0x20], data[4..].to_vec()].concat()).unwrap();
 
     AddrInfo::new(
         format!("/ip4/{}/tcp/43/p2p/{}", ip, peer_id.to_base58())
diff --git a/network/fuzz/src/lib.rs b/network/fuzz/src/lib.rs
index 94138a6b27..32e680c541 100644
--- a/network/fuzz/src/lib.rs
+++ b/network/fuzz/src/lib.rs
@@ -14,6 +14,10 @@ impl<'a> BufManager<'a> {
         }
     }
 
+    pub fn is_empty(&self) -> bool {
+        self.buf.is_empty()
+    }
+
     pub fn len(&self) -> usize {
         self.buf.len()
     }
@@ -25,8 +29,7 @@ impl<'a> BufManager<'a> {
             self.offset += len;
             r
         } else {
-            let mut r = Vec::<u8>::with_capacity(len);
-            r.resize(len, 0);
+            let mut r = vec![0; len];
             r[0..(buf_len - self.offset)].copy_from_slice(&self.buf[self.offset..]);
             self.offset = buf_len;
             r
@@ -138,6 +141,6 @@ impl FromBytes<PeerId> for PeerId {
         32
     }
     fn from_bytes(d: &[u8]) -> PeerId {
-        PeerId::from_bytes(vec![vec![0x12], vec![0x20], d.to_vec()].concat()).unwrap()
+        PeerId::from_bytes([vec![0x12], vec![0x20], d.to_vec()].concat()).unwrap()
     }
 }