diff --git a/pythnet/pythnet_sdk/src/messages.rs b/pythnet/pythnet_sdk/src/messages.rs
index 4444bb2717..58013ec228 100644
--- a/pythnet/pythnet_sdk/src/messages.rs
+++ b/pythnet/pythnet_sdk/src/messages.rs
@@ -183,9 +183,12 @@ impl Arbitrary for TwapMessage {
     }
 }
 
+pub const PUBLISHER_STAKE_CAPS_MESSAGE_VERSION: u8 = 1;
+
 #[repr(C)]
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct PublisherStakeCapsMessage {
+    pub version:      u8,
     pub publish_time: i64,
     pub caps:         PrefixedVec<u16, PublisherStakeCap>, // PrefixedVec because we might have more than 256 publishers
 }
@@ -202,6 +205,7 @@ impl Arbitrary for PublisherStakeCapsMessage {
     fn arbitrary(g: &mut quickcheck::Gen) -> Self {
         let caps = Vec::arbitrary(g);
         PublisherStakeCapsMessage {
+            version:      PUBLISHER_STAKE_CAPS_MESSAGE_VERSION,
             publish_time: i64::arbitrary(g),
             caps:         caps.into(),
         }