diff --git a/ethers-core/src/types/chain.rs b/ethers-core/src/types/chain.rs
index 01da44d4..5397e78f 100644
--- a/ethers-core/src/types/chain.rs
+++ b/ethers-core/src/types/chain.rs
@@ -22,6 +22,7 @@ pub enum Chain {
     XDai = 100,
     Polygon = 137,
     Fantom = 250,
+    Dev = 1337,
     FantomTestnet = 4002,
     PolygonMumbai = 80001,
     Avalanche = 43114,
@@ -60,6 +61,7 @@ impl fmt::Display for Chain {
             Chain::Optimism => "optimism",
             Chain::OptimismKovan => "optimism-kovan",
             Chain::Fantom => "fantom",
+            Chain::Dev => "dev",
             Chain::FantomTestnet => "fantom-testnet",
             Chain::BinanceSmartChain => "bsc",
             Chain::BinanceSmartChainTestnet => "bsc-testnet",
@@ -103,6 +105,7 @@ impl TryFrom<u64> for Chain {
             42 => Chain::Kovan,
             100 => Chain::XDai,
             137 => Chain::Polygon,
+            1337 => Chain::Dev,
             250 => Chain::Fantom,
             4002 => Chain::FantomTestnet,
             80001 => Chain::PolygonMumbai,
@@ -147,6 +150,7 @@ impl FromStr for Chain {
             "optimism-kovan" => Chain::OptimismKovan,
             "fantom" => Chain::Fantom,
             "fantom-testnet" => Chain::FantomTestnet,
+            "dev" => Chain::Dev,
             "bsc" => Chain::BinanceSmartChain,
             "bsc-testnet" => Chain::BinanceSmartChainTestnet,
             "arbitrum" => Chain::Arbitrum,
diff --git a/ethers-etherscan/src/errors.rs b/ethers-etherscan/src/errors.rs
index fcd59263..cad7a808 100644
--- a/ethers-etherscan/src/errors.rs
+++ b/ethers-etherscan/src/errors.rs
@@ -25,4 +25,6 @@ pub enum EtherscanError {
     ContractCodeNotVerified(Address),
     #[error(transparent)]
     IO(#[from] std::io::Error),
+    #[error("Local networks (e.g. ganache, geth --dev) cannot be indexed by etherscan")]
+    LocalNetworksNotSupported,
 }
diff --git a/ethers-etherscan/src/lib.rs b/ethers-etherscan/src/lib.rs
index 4bf20b35..2a0ad068 100644
--- a/ethers-etherscan/src/lib.rs
+++ b/ethers-etherscan/src/lib.rs
@@ -92,6 +92,7 @@ impl Client {
             Chain::Cronos => {
                 (Url::parse("https://api.cronoscan.com/api"), Url::parse("https://cronoscan.com"))
             }
+            Chain::Dev => return Err(EtherscanError::LocalNetworksNotSupported),
             chain => return Err(EtherscanError::ChainNotSupported(chain)),
         };
 
@@ -128,6 +129,7 @@ impl Client {
             Chain::Moonbeam | Chain::MoonbeamDev | Chain::Moonriver => {
                 std::env::var("MOONSCAN_API_KEY")?
             }
+            Chain::Dev => return Err(errors::EtherscanError::LocalNetworksNotSupported),
         };
         Self::new(chain, api_key)
     }
@@ -241,6 +243,12 @@ mod tests {
         assert_eq!(err.to_string(), "chain xdai not supported");
     }
 
+    #[test]
+    fn local_networks_not_supported() {
+        let err = Client::new_from_env(Chain::Dev).unwrap_err();
+        assert!(matches!(err, EtherscanError::LocalNetworksNotSupported));
+    }
+
     pub async fn run_at_least_duration(duration: Duration, block: impl Future) {
         let start = SystemTime::now();
         block.await;
diff --git a/ethers-signers/src/wallet/mod.rs b/ethers-signers/src/wallet/mod.rs
index 65e8e7d1..efde9cf2 100644
--- a/ethers-signers/src/wallet/mod.rs
+++ b/ethers-signers/src/wallet/mod.rs
@@ -117,10 +117,6 @@ impl<D: Sync + Send + DigestSigner<Sha256Proxy, RecoverableSignature>> Signer fo
     }
 
     /// Gets the wallet's chain id
-    ///
-    /// # Panics
-    ///
-    /// If the chain id has not already been set.
     fn chain_id(&self) -> u64 {
         self.chain_id
     }