[RELEASE] Bump main branch to 1.28.0-dev (#4081)

Author: marcalff

CHANGELOG.md

@@ -15,6 +15,9 @@ Increment the:
 
 ## [Unreleased]
 
+* [RELEASE] Bump main branch to 1.28.0-dev
+  [#4081](https://github.com/open-telemetry/opentelemetry-cpp/pull/4081)
+
 ## [1.27.0] 2026-05-13
 
 * [RELEASE] Bump main branch to 1.27.0-dev

CMakeLists.txt

@@ -9,8 +9,8 @@ if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.20.0")
   cmake_policy(SET CMP0117 NEW)
 endif()
 
-set(OPENTELEMETRY_VERSION_NUMBER "1.27.0")
-set(OPENTELEMETRY_VERSION_SUFFIX "")
+set(OPENTELEMETRY_VERSION_NUMBER "1.28.0")
+set(OPENTELEMETRY_VERSION_SUFFIX "-dev")
 set(OPENTELEMETRY_VERSION
     "${OPENTELEMETRY_VERSION_NUMBER}${OPENTELEMETRY_VERSION_SUFFIX}")
 

MODULE.bazel

@@ -3,7 +3,7 @@
 
 module(
     name = "opentelemetry-cpp",
-    version = "1.27.0",
+    version = "1.28.0-dev",
     compatibility_level = 0,
     repo_name = "io_opentelemetry_cpp",
 )

api/include/opentelemetry/version.h

@@ -12,9 +12,9 @@
 #endif
 
 // NOLINTBEGIN(cppcoreguidelines-macro-to-enum)
-#define OPENTELEMETRY_VERSION "1.27.0"
+#define OPENTELEMETRY_VERSION "1.28.0-dev"
 #define OPENTELEMETRY_VERSION_MAJOR 1
-#define OPENTELEMETRY_VERSION_MINOR 27
+#define OPENTELEMETRY_VERSION_MINOR 28
 #define OPENTELEMETRY_VERSION_PATCH 0
 // NOLINTEND(cppcoreguidelines-macro-to-enum)
 

sdk/include/opentelemetry/sdk/version/version.h

@@ -3,7 +3,7 @@
 
 #pragma once
 
-#define OPENTELEMETRY_SDK_VERSION "1.27.0"
+#define OPENTELEMETRY_SDK_VERSION "1.28.0-dev"
 
 #include "opentelemetry/version.h"
 

sdk/src/version/version.cc

@@ -12,18 +12,18 @@ namespace sdk
 namespace version
 {
 const int major_version    = 1;
-const int minor_version    = 27;
+const int minor_version    = 28;
 const int patch_version    = 0;
-const char *pre_release    = "";
+const char *pre_release    = "dev";
 const char *build_metadata = "none";
-const char *short_version  = "1.27.0";
-const char *full_version   = "1.27.0";
+const char *short_version  = "1.28.0";
+const char *full_version   = "1.28.0-dev";
 /**
  * Release date.
  * For published releases: YYYY-MM-DD
  * For -dev releases: empty string
  */
-const char *build_date = "2026-05-13";
+const char *build_date = "";
 }  // namespace version
 }  // namespace sdk
 OPENTELEMETRY_END_NAMESPACE

tbump.toml

@@ -21,7 +21,7 @@
 github_url = "https://github.com/open-telemetry/opentelemetry-cpp"
 
 [version]
-current = "1.27.0"
+current = "1.28.0-dev"
 
 # Example of a semver regexp.
 # Make sure this matches current_version before