diff --git a/crates/cnidarium/src/gen/proto_descriptor.bin.no_lfs b/crates/cnidarium/src/gen/proto_descriptor.bin.no_lfs
index aea1e9b9c1..d50e1bd881 100644
Binary files a/crates/cnidarium/src/gen/proto_descriptor.bin.no_lfs and b/crates/cnidarium/src/gen/proto_descriptor.bin.no_lfs differ
diff --git a/crates/core/component/shielded-pool/src/ics20_withdrawal.rs b/crates/core/component/shielded-pool/src/ics20_withdrawal.rs
index 1c7941f13f..e548b471fb 100644
--- a/crates/core/component/shielded-pool/src/ics20_withdrawal.rs
+++ b/crates/core/component/shielded-pool/src/ics20_withdrawal.rs
@@ -144,6 +144,7 @@ impl From<Ics20Withdrawal> for pb::FungibleTokenPacketData {
             denom: w.denom.to_string(),
             receiver: w.destination_chain_address,
             sender: w.return_address.to_string(),
+            memo: "".to_string(),
         }
     }
 }
diff --git a/crates/proto/src/gen/penumbra.core.component.ibc.v1.rs b/crates/proto/src/gen/penumbra.core.component.ibc.v1.rs
index 0a554e8ceb..6b2c8ca9c4 100644
--- a/crates/proto/src/gen/penumbra.core.component.ibc.v1.rs
+++ b/crates/proto/src/gen/penumbra.core.component.ibc.v1.rs
@@ -29,6 +29,9 @@ pub struct FungibleTokenPacketData {
     /// the recipient address on the destination chain
     #[prost(string, tag = "4")]
     pub receiver: ::prost::alloc::string::String,
+    /// optional memo
+    #[prost(string, tag = "5")]
+    pub memo: ::prost::alloc::string::String,
 }
 impl ::prost::Name for FungibleTokenPacketData {
     const NAME: &'static str = "FungibleTokenPacketData";
diff --git a/crates/proto/src/gen/penumbra.core.component.ibc.v1.serde.rs b/crates/proto/src/gen/penumbra.core.component.ibc.v1.serde.rs
index 5dc907c6f3..a12442b052 100644
--- a/crates/proto/src/gen/penumbra.core.component.ibc.v1.serde.rs
+++ b/crates/proto/src/gen/penumbra.core.component.ibc.v1.serde.rs
@@ -558,6 +558,9 @@ impl serde::Serialize for FungibleTokenPacketData {
         if !self.receiver.is_empty() {
             len += 1;
         }
+        if !self.memo.is_empty() {
+            len += 1;
+        }
         let mut struct_ser = serializer.serialize_struct("penumbra.core.component.ibc.v1.FungibleTokenPacketData", len)?;
         if !self.denom.is_empty() {
             struct_ser.serialize_field("denom", &self.denom)?;
@@ -571,6 +574,9 @@ impl serde::Serialize for FungibleTokenPacketData {
         if !self.receiver.is_empty() {
             struct_ser.serialize_field("receiver", &self.receiver)?;
         }
+        if !self.memo.is_empty() {
+            struct_ser.serialize_field("memo", &self.memo)?;
+        }
         struct_ser.end()
     }
 }
@@ -585,6 +591,7 @@ impl<'de> serde::Deserialize<'de> for FungibleTokenPacketData {
             "amount",
             "sender",
             "receiver",
+            "memo",
         ];
 
         #[allow(clippy::enum_variant_names)]
@@ -593,6 +600,7 @@ impl<'de> serde::Deserialize<'de> for FungibleTokenPacketData {
             Amount,
             Sender,
             Receiver,
+            Memo,
             __SkipField__,
         }
         impl<'de> serde::Deserialize<'de> for GeneratedField {
@@ -619,6 +627,7 @@ impl<'de> serde::Deserialize<'de> for FungibleTokenPacketData {
                             "amount" => Ok(GeneratedField::Amount),
                             "sender" => Ok(GeneratedField::Sender),
                             "receiver" => Ok(GeneratedField::Receiver),
+                            "memo" => Ok(GeneratedField::Memo),
                             _ => Ok(GeneratedField::__SkipField__),
                         }
                     }
@@ -642,6 +651,7 @@ impl<'de> serde::Deserialize<'de> for FungibleTokenPacketData {
                 let mut amount__ = None;
                 let mut sender__ = None;
                 let mut receiver__ = None;
+                let mut memo__ = None;
                 while let Some(k) = map_.next_key()? {
                     match k {
                         GeneratedField::Denom => {
@@ -668,6 +678,12 @@ impl<'de> serde::Deserialize<'de> for FungibleTokenPacketData {
                             }
                             receiver__ = Some(map_.next_value()?);
                         }
+                        GeneratedField::Memo => {
+                            if memo__.is_some() {
+                                return Err(serde::de::Error::duplicate_field("memo"));
+                            }
+                            memo__ = Some(map_.next_value()?);
+                        }
                         GeneratedField::__SkipField__ => {
                             let _ = map_.next_value::<serde::de::IgnoredAny>()?;
                         }
@@ -678,6 +694,7 @@ impl<'de> serde::Deserialize<'de> for FungibleTokenPacketData {
                     amount: amount__.unwrap_or_default(),
                     sender: sender__.unwrap_or_default(),
                     receiver: receiver__.unwrap_or_default(),
+                    memo: memo__.unwrap_or_default(),
                 })
             }
         }
diff --git a/crates/proto/src/gen/proto_descriptor.bin.no_lfs b/crates/proto/src/gen/proto_descriptor.bin.no_lfs
index e6976b5326..35cbd9de60 100644
Binary files a/crates/proto/src/gen/proto_descriptor.bin.no_lfs and b/crates/proto/src/gen/proto_descriptor.bin.no_lfs differ