diff --git a/substrate/client/Cargo.toml b/substrate/client/Cargo.toml
index 626d4a65..d47be773 100644
--- a/substrate/client/Cargo.toml
+++ b/substrate/client/Cargo.toml
@@ -19,6 +19,7 @@ thiserror = { version = "1", optional = true }
 
 futures = "0.3"
 
+hex = "0.4"
 scale = { package = "parity-scale-codec", version = "3" }
 scale-info = { version = "2", optional = true }
 
diff --git a/substrate/client/src/serai/mod.rs b/substrate/client/src/serai/mod.rs
index 4702f2e4..a96d528c 100644
--- a/substrate/client/src/serai/mod.rs
+++ b/substrate/client/src/serai/mod.rs
@@ -204,7 +204,7 @@ impl Serai {
       .0
       .rpc()
       .deref()
-      .request::<[u8; 32]>("author_submitExtrinsic", subxt::rpc::rpc_params![tx])
+      .request::<String>("author_submitExtrinsic", subxt::rpc::rpc_params![hex::encode(tx)])
       .await
       // Drop the hash, which is the hash of the raw extrinsic, as extrinsics are allowed to share
       // hashes and this hash is accordingly useless/unsafe