diff --git a/Cargo.toml b/Cargo.toml
index f6dcfd6..4cf5e79 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -45,6 +45,7 @@ minicbor = { version = "0.24", features = ["derive"] }
 nom = { version = "7", default-features = false }
 phf = { version = "0.11", features = ["macros"], default-features = false }
 rand_xoshiro = "0.6"
+rustversion = "1.0"
 secp256k1 = { version = "0.29", default-features = false }
 serde = { version = "1.0.156", features = ["derive"], default-features = false }
 serde_json = "1"
diff --git a/stratum-v1/Cargo.toml b/stratum-v1/Cargo.toml
index 0f4d208..9aeb698 100644
--- a/stratum-v1/Cargo.toml
+++ b/stratum-v1/Cargo.toml
@@ -20,6 +20,7 @@ embedded-io-async = { workspace = true }
 faster-hex = { version = "0.10", default-features = false }
 heapless = { workspace = true, features = ["serde"] }
 log = { workspace = true, optional = true }
+rustversion = { workspace = true }
 serde = { workspace = true }
 serde-json-core = { workspace = true, features = ["custom-error-messages"] }
 
@@ -27,7 +28,7 @@ serde-json-core = { workspace = true, features = ["custom-error-messages"] }
 defmt-03 = [
     "dep:defmt",
     "embedded-io-async/defmt-03",
-    # "faster-hex/defmt-03", # will enable it after faster-hex publish PR#54
+    # "faster-hex/defmt-03", # will enable it after faster-hex publish 0.11
     "heapless/defmt-03",
     "serde-json-core/defmt",
 ]
diff --git a/stratum-v1/src/client/mod.rs b/stratum-v1/src/client/mod.rs
index 43bd163..b9912c2 100644
--- a/stratum-v1/src/client/mod.rs
+++ b/stratum-v1/src/client/mod.rs
@@ -189,16 +189,12 @@ impl<C: Read + ReadReady + Write, const RX_BUF_SIZE: usize, const TX_BUF_SIZE: u
             self.rx_buf.copy_within(start..self.rx_free_pos, 0);
             self.rx_free_pos -= start;
         }
-        if self
-            .network_conn
-            .read_ready()
-            .map_err(|_| Error::NetworkError)?
-        {
+        if self.network_conn.read_ready().map_err(|_| Error::Network)? {
             let n = self
                 .network_conn
                 .read(self.rx_buf[self.rx_free_pos..].as_mut())
                 .await
-                .map_err(|_| Error::NetworkError)?;
+                .map_err(|_| Error::Network)?;
             debug!("read {} bytes @{}", n, self.rx_free_pos);
             trace!("{:?}", &self.rx_buf[self.rx_free_pos..self.rx_free_pos + n]);
             self.rx_free_pos += n;
@@ -220,7 +216,7 @@ impl<C: Read + ReadReady + Write, const RX_BUF_SIZE: usize, const TX_BUF_SIZE: u
         self.network_conn
             .write_all(&self.tx_buf[..req_len + 1])
             .await
-            .map_err(|_| Error::NetworkError)
+            .map_err(|_| Error::Network)
     }
 
     /// # Configure Client
diff --git a/stratum-v1/src/error.rs b/stratum-v1/src/error.rs
index 66b4fc3..5c1d1a1 100644
--- a/stratum-v1/src/error.rs
+++ b/stratum-v1/src/error.rs
@@ -54,8 +54,8 @@ pub enum Error {
 
     /// Network error
     // #[from]
-    // NetworkError(embedded_io::ErrorKind),
-    NetworkError,
+    // Network(embedded_io::ErrorKind),
+    Network,
 
     IdNotFound(u64),
 
@@ -73,8 +73,10 @@ pub enum Error {
     HexError(faster_hex::Error),
 }
 
-// impl core::error::Error for Error {}
+#[rustversion::since(1.81)]
+impl core::error::Error for Error {}
 
+#[rustversion::since(1.81)]
 impl core::fmt::Display for Error {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
         write!(f, "{self:?}")