From c71cc19c0c34b88d978f40e5b3f471ea26f6544f Mon Sep 17 00:00:00 2001
From: Siddha Kilaru <siddha@databento.com>
Date: Wed, 29 Apr 2026 12:39:44 -0700
Subject: [PATCH 1/2] ADD: Add InstrumentClass, IndicativeClosePrice

---
 CHANGELOG.md                | 6 ++++++
 include/databento/enums.hpp | 9 +++++++++
 src/enums.cpp               | 9 +++++++++
 3 files changed, 24 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 72462f5..6ff546d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 0.56.0 - TBD
+
+### Enhancements
+- Added `Index` `InstrumentClass` variant
+- Added `StatType` variants `IndicativeClosePrice` and `VenueSpecificPrice1`
+
 ## 0.55.0 - 2026-04-28
 
 ### Enhancements
diff --git a/include/databento/enums.hpp b/include/databento/enums.hpp
index f5cd9bd..f771fc9 100644
--- a/include/databento/enums.hpp
+++ b/include/databento/enums.hpp
@@ -171,6 +171,8 @@ enum InstrumentClass : char {
   Call = 'C',
   // A future.
   Future = 'F',
+  // An index.
+  Index = 'I',
   // A stock.
   Stock = 'K',
   // A spread composed of multiple instrument classes.
@@ -436,10 +438,17 @@ enum StatType : std::uint16_t {
   // date.
   // `quantity` will be set. `ts_ref` will indicate the trading date of the volume.
   BlockVolume = 19,
+  // The probable price of the last trade of an instrument published during the trading
+  // session. `price` will be set.
+  IndicativeClosePrice = 20,
   // A venue specific volume statistic. Refer to the venue documentation for more
   // information.
   // `quantity` will be set.
   VenueSpecificVolume1 = 10001,
+  // A venue specific price statistic. Refer to the venue documentation for more
+  // information.
+  // `price` will be set.
+  VenueSpecificPrice1 = 10002,
 };
 }  // namespace stat_type
 using stat_type::StatType;
diff --git a/src/enums.cpp b/src/enums.cpp
index d30b1f8..36aadd7 100644
--- a/src/enums.cpp
+++ b/src/enums.cpp
@@ -253,6 +253,9 @@ const char* ToString(InstrumentClass instrument_class) {
     case InstrumentClass::Future: {
       return "Future";
     }
+    case InstrumentClass::Index: {
+      return "Index";
+    }
     case InstrumentClass::Stock: {
       return "Stock";
     }
@@ -546,9 +549,15 @@ const char* ToString(StatType stat_type) {
     case StatType::BlockVolume: {
       return "BlockVolume";
     }
+    case StatType::IndicativeClosePrice: {
+      return "IndicativeClosePrice";
+    }
     case StatType::VenueSpecificVolume1: {
       return "VenueSpecificVolume1";
     }
+    case StatType::VenueSpecificPrice1: {
+      return "VenueSpecificPrice1";
+    }
     default: {
       return "Unknown";
     }

From 6a86cf164dcbe367d816dfed0694d34ce05b38bc Mon Sep 17 00:00:00 2001
From: Carter Green <carter@databento.com>
Date: Tue, 5 May 2026 10:49:01 -0500
Subject: [PATCH 2/2] VER: Release C++ client 0.56.0

---
 CHANGELOG.md   | 2 +-
 CMakeLists.txt | 2 +-
 pkg/PKGBUILD   | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6ff546d..14a3a11 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## 0.56.0 - TBD
+## 0.56.0 - 2026-05-05
 
 ### Enhancements
 - Added `Index` `InstrumentClass` variant
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f6e34de..420a6f1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@ cmake_minimum_required(VERSION 3.24..4.2)
 
 project(
   databento
-  VERSION 0.55.0
+  VERSION 0.56.0
   LANGUAGES CXX
   DESCRIPTION "Official Databento client library"
 )
diff --git a/pkg/PKGBUILD b/pkg/PKGBUILD
index 1f649b1..fb75728 100644
--- a/pkg/PKGBUILD
+++ b/pkg/PKGBUILD
@@ -1,7 +1,7 @@
 # Maintainer: Databento <support@databento.com>
 _pkgname=databento-cpp
 pkgname=databento-cpp-git
-pkgver=0.55.0
+pkgver=0.56.0
 pkgrel=1
 pkgdesc="Official C++ client for Databento"
 arch=('any')