diff --git a/crates/katana/core/Cargo.toml b/crates/katana/core/Cargo.toml
index 66231271f1..9f1f8ecd58 100644
--- a/crates/katana/core/Cargo.toml
+++ b/crates/katana/core/Cargo.toml
@@ -28,7 +28,6 @@ reqwest.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 starknet.workspace = true
-starknet-crypto.workspace = true
 starknet-types-core.workspace = true
 thiserror.workspace = true
 tokio.workspace = true
@@ -37,6 +36,7 @@ url.workspace = true
 
 alloy-primitives = { workspace = true, features = [ "serde" ] }
 alloy-sol-types = { workspace = true, default-features = false, features = [ "json" ] }
+starknet-crypto = { workspace = true, optional = true }
 
 alloy-contract = { workspace = true, default-features = false }
 alloy-network = { workspace = true, default-features = false }
@@ -50,4 +50,4 @@ hex.workspace = true
 tempfile.workspace = true
 
 [features]
-starknet-messaging = [  ]
+starknet-messaging = [ "dep:starknet-crypto" ]
diff --git a/crates/katana/primitives/src/class.rs b/crates/katana/primitives/src/class.rs
index 7b8dbb6b90..e227e12c08 100644
--- a/crates/katana/primitives/src/class.rs
+++ b/crates/katana/primitives/src/class.rs
@@ -57,13 +57,6 @@ impl ContractClass {
         }
     }
 
-    /// Checks if this contract class is a Sierra class.
-    ///
-    /// Returns `true` if the contract class is a Sierra class, `false` otherwise.
-    pub fn is_class(&self) -> bool {
-        matches!(self, Self::Class(_))
-    }
-
     /// Checks if this contract class is a Cairo 0 legacy class.
     ///
     /// Returns `true` if the contract class is a legacy class, `false` otherwise.