diff --git a/CHANGELOG.md b/CHANGELOG.md
index 952c6c6958..5a271b3be4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,8 +15,29 @@ Increment the:
 
 ## [Unreleased]
 
+## [1.15.0] 2024-02-27
+
+* [SDK] Change OTLP HTTP content_type default to binary
+  [#2558](https://github.com/open-telemetry/opentelemetry-cpp/pull/2558)
+* [SDK] Fix observable attributes drop
+   [#2557](https://github.com/open-telemetry/opentelemetry-cpp/pull/2557)
+
+Important changes:
+
+* [SDK] Change OTLP HTTP content_type default to binary
+  [#2558](https://github.com/open-telemetry/opentelemetry-cpp/pull/2558)
+  * Support for specifying OTLP serialization protocol using env variables
+  `OTEL_EXPORTER_OTLP_PROTOCOL`, `OTEL_EXPORTER_OTLP_TRACES_PROTOCOL`,
+  `OTEL_EXPORTER_OTLP_METRICS_PROTOCOL`. The accepted values are
+  `http/protobuf` or `http/json`.
+
+Breaking changes:
+
 * [SDK] Change OTLP HTTP content_type default to binary
   [#2558](https://github.com/open-telemetry/opentelemetry-cpp/pull/2558)
+  * The default serialization protocol for OTLP HTTP Exporter is changed
+  from `http/json` to `http/protobuf`. The application need to explicitly
+  configure the `http/json` if they want so.
 
 ## [1.14.1] 2024-02-23
 
diff --git a/api/include/opentelemetry/version.h b/api/include/opentelemetry/version.h
index 725f8f34bf..31f6e35acb 100644
--- a/api/include/opentelemetry/version.h
+++ b/api/include/opentelemetry/version.h
@@ -10,10 +10,10 @@
 #  define OPENTELEMETRY_ABI_VERSION_NO 1
 #endif
 
-#define OPENTELEMETRY_VERSION "1.14.1"
+#define OPENTELEMETRY_VERSION "1.15.0"
 #define OPENTELEMETRY_VERSION_MAJOR 1
-#define OPENTELEMETRY_VERSION_MINOR 14
-#define OPENTELEMETRY_VERSION_PATCH 1
+#define OPENTELEMETRY_VERSION_MINOR 15
+#define OPENTELEMETRY_VERSION_PATCH 0
 
 #define OPENTELEMETRY_ABI_VERSION OPENTELEMETRY_STRINGIFY(OPENTELEMETRY_ABI_VERSION_NO)
 
diff --git a/docs/public/conf.py b/docs/public/conf.py
index ebbfcda15d..1747696a30 100644
--- a/docs/public/conf.py
+++ b/docs/public/conf.py
@@ -24,7 +24,7 @@
 author = 'OpenTelemetry authors'
 
 # The full version, including alpha/beta/rc tags
-release = "1.14.1"
+release = "1.15.0"
 
 # Run sphinx on subprojects and copy output
 # -----------------------------------------
diff --git a/sdk/include/opentelemetry/sdk/version/version.h b/sdk/include/opentelemetry/sdk/version/version.h
index 14c3f39953..f7f6f4f0fd 100644
--- a/sdk/include/opentelemetry/sdk/version/version.h
+++ b/sdk/include/opentelemetry/sdk/version/version.h
@@ -5,7 +5,7 @@
 
 #include "opentelemetry/detail/preprocessor.h"
 
-#define OPENTELEMETRY_SDK_VERSION "1.14.1"
+#define OPENTELEMETRY_SDK_VERSION "1.15.0"
 
 #include "opentelemetry/version.h"
 
diff --git a/sdk/src/version/version.cc b/sdk/src/version/version.cc
index ade8d62f4b..876db5114d 100644
--- a/sdk/src/version/version.cc
+++ b/sdk/src/version/version.cc
@@ -12,13 +12,13 @@ namespace sdk
 namespace version
 {
 const int major_version    = 1;
-const int minor_version    = 14;
-const int patch_version    = 1;
+const int minor_version    = 15;
+const int patch_version    = 0;
 const char *pre_release    = "NONE";
 const char *build_metadata = "NONE";
-const char *short_version  = "1.14.1";
-const char *full_version   = "1.14.1-NONE-NONE";
-const char *build_date     = "Fri Feb 23 21:04:34 UTC 2024";
+const char *short_version  = "1.15.0";
+const char *full_version   = "1.15.0-NONE-NONE";
+const char *build_date     = "Tue Feb 27 18:25:51 UTC 2024";
 }  // namespace version
 }  // namespace sdk
 OPENTELEMETRY_END_NAMESPACE