diff --git a/substrate/abi/src/lib.rs b/substrate/abi/src/lib.rs
index 2e873f4c..8a5255f3 100644
--- a/substrate/abi/src/lib.rs
+++ b/substrate/abi/src/lib.rs
@@ -65,7 +65,6 @@ pub struct Extra {
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct SignedPayloadExtra {
   pub spec_version: u32,
-  pub tx_version: u32,
   pub genesis: [u8; 32],
   pub mortality_checkpoint: [u8; 32],
 }
diff --git a/substrate/client/src/serai/mod.rs b/substrate/client/src/serai/mod.rs
index 0504be7e..e42914e6 100644
--- a/substrate/client/src/serai/mod.rs
+++ b/substrate/client/src/serai/mod.rs
@@ -167,7 +167,6 @@ impl Serai {
 
   pub fn sign(&self, signer: &Pair, call: Call, nonce: u32, tip: u64) -> Transaction {
     const SPEC_VERSION: u32 = 1;
-    const TX_VERSION: u32 = 1;
 
     let extra =
       Extra { era: sp_runtime::generic::Era::Immortal, nonce: Compact(nonce), tip: Compact(tip) };
@@ -176,7 +175,6 @@ impl Serai {
       &extra,
       SignedPayloadExtra {
         spec_version: SPEC_VERSION,
-        tx_version: TX_VERSION,
         genesis: self.genesis,
         mortality_checkpoint: self.genesis,
       },