diff --git a/ethers-contract/Cargo.toml b/ethers-contract/Cargo.toml
index dc0d5483..a964e345 100644
--- a/ethers-contract/Cargo.toml
+++ b/ethers-contract/Cargo.toml
@@ -47,7 +47,7 @@ ethers-solc.workspace = true
 ethers-providers = { workspace = true, features = ["ws"] }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
-tokio = { workspace = true, features = ["macros"] }
+tokio = { workspace = true, features = ["macros", "rt-multi-thread"] }
 
 [features]
 default = ["abigen"]
diff --git a/ethers-core/src/types/chain.rs b/ethers-core/src/types/chain.rs
index fd23c83b..c6580783 100644
--- a/ethers-core/src/types/chain.rs
+++ b/ethers-core/src/types/chain.rs
@@ -621,7 +621,7 @@ mod tests {
     fn serde_to_string_match() {
         for chain in Chain::iter() {
             let chain_serde = serde_json::to_string(&chain).unwrap();
-            let chain_string = format!("\"{}\"", chain.to_string());
+            let chain_string = format!("\"{chain}\"");
             assert_eq!(chain_serde, chain_string);
         }
     }
diff --git a/ethers-middleware/Cargo.toml b/ethers-middleware/Cargo.toml
index a8710206..a6f2799e 100644
--- a/ethers-middleware/Cargo.toml
+++ b/ethers-middleware/Cargo.toml
@@ -60,7 +60,7 @@ once_cell.workspace = true
 reqwest = { workspace = true, features = ["json", "rustls"] }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
-tokio = { workspace = true, features = ["rt", "macros", "time"] }
+tokio = { workspace = true, features = ["rt-multi-thread", "macros", "time"] }
 
 [features]
 default = ["rustls"]
diff --git a/ethers-providers/Cargo.toml b/ethers-providers/Cargo.toml
index 210ffedd..5c89c2bf 100644
--- a/ethers-providers/Cargo.toml
+++ b/ethers-providers/Cargo.toml
@@ -74,7 +74,7 @@ web-sys = { version = "0.3", features = ["console"] }
 getrandom.workspace = true
 
 [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
-tokio = { workspace = true, features = ["rt", "macros", "time"] }
+tokio = { workspace = true, features = ["rt-multi-thread", "macros", "time"] }
 tempfile = "3.4.0"
 
 [features]
diff --git a/ethers-signers/Cargo.toml b/ethers-signers/Cargo.toml
index cd23c776..309e0ef4 100644
--- a/ethers-signers/Cargo.toml
+++ b/ethers-signers/Cargo.toml
@@ -74,7 +74,7 @@ tracing-subscriber.workspace = true
 
 [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
 yubihsm = { version = "0.42.0-pre.0", features = ["secp256k1", "usb", "mockhsm"] }
-tokio = { workspace = true, features = ["macros", "rt"] }
+tokio = { workspace = true, features = ["macros", "rt-multi-thread"] }
 
 [features]
 futures = ["futures-util", "futures-executor"]
diff --git a/ethers-solc/Cargo.toml b/ethers-solc/Cargo.toml
index 0943167f..d4102ceb 100644
--- a/ethers-solc/Cargo.toml
+++ b/ethers-solc/Cargo.toml
@@ -64,7 +64,7 @@ svm = { package = "svm-rs", version = "0.2", default-features = false, features
     "blocking",
 ], optional = true }
 svm-builds = { package = "svm-rs-builds", version = "0.1", optional = true }
-tokio = { workspace = true, features = ["rt"] }
+tokio = { workspace = true, features = ["rt-multi-thread"] }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 # NOTE: this enables wasm compatibility for getrandom indirectly