diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7bb2de..d924e52 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 0.46.1 - 2026-01-27
+
+### Enhancements
+- Added new publisher for Blue Ocean ATS (`OCEA_MEMOIR_OCEA`)
+
 ## 0.46.0 - 2026-01-20
 
 ### Enhancements
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9fe3f08..88ddd42 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@ cmake_minimum_required(VERSION 3.24..4.2)
 
 project(
   databento
-  VERSION 0.46.0
+  VERSION 0.46.1
   LANGUAGES CXX
   DESCRIPTION "Official Databento client library"
 )
diff --git a/include/databento/publishers.hpp b/include/databento/publishers.hpp
index 016d18a..28bb8af 100644
--- a/include/databento/publishers.hpp
+++ b/include/databento/publishers.hpp
@@ -111,6 +111,8 @@ enum class Venue : std::uint16_t {
   Xeee = 51,
   // Cboe Futures Exchange
   Xcbf = 52,
+  // Blue Ocean ATS
+  Ocea = 53,
 };
 
 // A source of data.
@@ -195,6 +197,8 @@ enum class Dataset : std::uint16_t {
   XeeeEobi = 39,
   // Cboe Futures Exchange PITCH
   XcbfPitch = 40,
+  // Blue Ocean ATS MEMOIR Depth
+  OceaMemoir = 41,
 };
 
 // A specific Venue from a specific data source.
@@ -411,6 +415,8 @@ enum class Publisher : std::uint16_t {
   XcbfPitchXcbf = 105,
   // Cboe Futures Exchange - Off-Market Trades
   XcbfPitchXoff = 106,
+  // Blue Ocean ATS MEMOIR
+  OceaMemoirOcea = 107,
 };
 
 // Get a Publisher's Venue.
diff --git a/pkg/PKGBUILD b/pkg/PKGBUILD
index d1afa91..26f6ddd 100644
--- a/pkg/PKGBUILD
+++ b/pkg/PKGBUILD
@@ -1,7 +1,7 @@
 # Maintainer: Databento <support@databento.com>
 _pkgname=databento-cpp
 pkgname=databento-cpp-git
-pkgver=0.46.0
+pkgver=0.46.1
 pkgrel=1
 pkgdesc="Official C++ client for Databento"
 arch=('any')
diff --git a/src/publishers.cpp b/src/publishers.cpp
index a432379..3a17828 100644
--- a/src/publishers.cpp
+++ b/src/publishers.cpp
@@ -167,6 +167,9 @@ const char* ToString(Venue venue) {
     case Venue::Xcbf: {
       return "XCBF";
     }
+    case Venue::Ocea: {
+      return "OCEA";
+    }
     default: {
       return "Unknown";
     }
@@ -336,6 +339,9 @@ Venue FromString(const std::string& str) {
   if (str == "XCBF") {
     return Venue::Xcbf;
   }
+  if (str == "OCEA") {
+    return Venue::Ocea;
+  }
   throw InvalidArgumentError{"FromString<Venue>", "str",
                              "unknown value '" + str + '\''};
 }
@@ -462,6 +468,9 @@ const char* ToString(Dataset dataset) {
     case Dataset::XcbfPitch: {
       return "XCBF.PITCH";
     }
+    case Dataset::OceaMemoir: {
+      return "OCEA.MEMOIR";
+    }
     default: {
       return "Unknown";
     }
@@ -595,6 +604,9 @@ Dataset FromString(const std::string& str) {
   if (str == "XCBF.PITCH") {
     return Dataset::XcbfPitch;
   }
+  if (str == "OCEA.MEMOIR") {
+    return Dataset::OceaMemoir;
+  }
   throw InvalidArgumentError{"FromString<Dataset>", "str",
                              "unknown value '" + str + '\''};
 }
@@ -919,6 +931,9 @@ Venue PublisherVenue(Publisher publisher) {
     case Publisher::XcbfPitchXoff: {
       return Venue::Xoff;
     }
+    case Publisher::OceaMemoirOcea: {
+      return Venue::Ocea;
+    }
     default: {
       throw InvalidArgumentError{
           "PublisherVenue", "publisher",
@@ -1247,6 +1262,9 @@ Dataset PublisherDataset(Publisher publisher) {
     case Publisher::XcbfPitchXoff: {
       return Dataset::XcbfPitch;
     }
+    case Publisher::OceaMemoirOcea: {
+      return Dataset::OceaMemoir;
+    }
     default: {
       throw InvalidArgumentError{
           "PublisherDataset", "publisher",
@@ -1576,6 +1594,9 @@ const char* ToString(Publisher publisher) {
     case Publisher::XcbfPitchXoff: {
       return "XCBF.PITCH.XOFF";
     }
+    case Publisher::OceaMemoirOcea: {
+      return "OCEA.MEMOIR.OCEA";
+    }
     default: {
       return "Unknown";
     }
@@ -1907,6 +1928,9 @@ Publisher FromString(const std::string& str) {
   if (str == "XCBF.PITCH.XOFF") {
     return Publisher::XcbfPitchXoff;
   }
+  if (str == "OCEA.MEMOIR.OCEA") {
+    return Publisher::OceaMemoirOcea;
+  }
   throw InvalidArgumentError{"FromString<Publisher>", "str",
                              "unknown value '" + str + '\''};
 }