diff --git a/core/src/hpke.rs b/core/src/hpke.rs
index 38a9d66e1..7dc3807fa 100644
--- a/core/src/hpke.rs
+++ b/core/src/hpke.rs
@@ -58,8 +58,8 @@ impl Label {
     /// Get the message-specific portion of the application info string for this label.
     pub fn as_bytes(&self) -> &'static [u8] {
         match self {
-            Self::InputShare => b"dap-07 input share",
-            Self::AggregateShare => b"dap-07 aggregate share",
+            Self::InputShare => b"dap-09 input share",
+            Self::AggregateShare => b"dap-09 aggregate share",
         }
     }
 }