diff --git a/definitions/ibc/lightclients/localhost/v1/localhost.proto b/definitions/ibc/lightclients/localhost/v1/localhost.proto
new file mode 100644
index 00000000..ad0141af
--- /dev/null
+++ b/definitions/ibc/lightclients/localhost/v1/localhost.proto
@@ -0,0 +1,18 @@
+syntax = "proto3";
+
+package ibc.lightclients.localhost.v1;
+
+option go_package = "github.com/cosmos/ibc-go/v6/modules/light-clients/09-localhost/types";
+
+import "gogoproto/gogo.proto";
+import "ibc/core/client/v1/client.proto";
+
+// ClientState defines a loopback (localhost) client. It requires (read-only)
+// access to keys outside the client prefix.
+message ClientState {
+  option (gogoproto.goproto_getters) = false;
+  // self chain ID
+  string chain_id = 1 [(gogoproto.moretags) = "yaml:\"chain_id\""];
+  // self latest block height
+  ibc.core.client.v1.Height height = 2 [(gogoproto.nullable) = false];
+}
diff --git a/src/lib.rs b/src/lib.rs
index 9e21a9b6..7006347d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -229,6 +229,9 @@ pub mod ibc {
     }
     pub mod lightclients {
         pub mod localhost {
+            pub mod v1 {
+                include_proto!("ibc.lightclients.localhost.v1.rs");
+            }
             pub mod v2 {
                 include_proto!("ibc.lightclients.localhost.v2.rs");
             }
diff --git a/src/prost/ibc.lightclients.localhost.v1.rs b/src/prost/ibc.lightclients.localhost.v1.rs
new file mode 100644
index 00000000..980676d1
--- /dev/null
+++ b/src/prost/ibc.lightclients.localhost.v1.rs
@@ -0,0 +1,12 @@
+/// ClientState defines a loopback (localhost) client. It requires (read-only)
+/// access to keys outside the client prefix.
+#[allow(clippy::derive_partial_eq_without_eq)]
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct ClientState {
+    /// self chain ID
+    #[prost(string, tag = "1")]
+    pub chain_id: ::prost::alloc::string::String,
+    /// self latest block height
+    #[prost(message, optional, tag = "2")]
+    pub height: ::core::option::Option<super::super::super::core::client::v1::Height>,
+}
diff --git a/src/prost/proto_descriptor.bin b/src/prost/proto_descriptor.bin
index 03bda7b9..45d2bf4f 100644
Binary files a/src/prost/proto_descriptor.bin and b/src/prost/proto_descriptor.bin differ
diff --git a/tools/proto-compiler/src/cmd/compile.rs b/tools/proto-compiler/src/cmd/compile.rs
index 3bf1421d..c828d19e 100644
--- a/tools/proto-compiler/src/cmd/compile.rs
+++ b/tools/proto-compiler/src/cmd/compile.rs
@@ -63,6 +63,7 @@ impl CompileCmd {
         // Paths
         let proto_paths = [
             format!("{}/../../definitions/mock", root),
+            format!("{}/../../definitions/ibc/lightclients/localhost/v1", root),
             format!("{}/../../definitions/stride/interchainquery/v1", root),
             format!("{}/ibc", ibc_dir.display()),
             format!("{}/cosmos/auth", sdk_dir.display()),
@@ -82,6 +83,7 @@ impl CompileCmd {
             format!("{}", ibc_dir.display()),
             format!("{}", ics_dir.display()),
             format!("{}/../../definitions/mock", root),
+            format!("{}/../../definitions/ibc/lightclients/localhost/v1", root),
             format!("{}/../../definitions/stride/interchainquery/v1", root),
         ];