diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f41326..d2d5e97 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,8 @@
 CHANGELOG.md
+<a name="4.3.0"></a>
+## [4.2.1](https://github.com/lightstep/lightstep-tracer-python/compare/4.2.1...4.3.0)
+* Add support for B3 headers
+
 <a name="4.2.1"></a>
 ## [4.2.0](https://github.com/lightstep/lightstep-tracer-python/compare/4.2.0...4.2.1)
 * Properly format OpenTracing error logs
diff --git a/VERSION b/VERSION
index d87edbf..8089590 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.2.1
\ No newline at end of file
+4.3.0
diff --git a/lightstep/version.py b/lightstep/version.py
index 1eb5582..65eab89 100644
--- a/lightstep/version.py
+++ b/lightstep/version.py
@@ -1 +1 @@
-LIGHTSTEP_PYTHON_TRACER_VERSION="4.2.1"
+LIGHTSTEP_PYTHON_TRACER_VERSION = "4.3.0"
diff --git a/setup.py b/setup.py
index 65eb10b..1b8a26b 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name='lightstep',
-    version='4.2.1',
+    version='4.3.0',
     description='LightStep Python OpenTracing Implementation',
     long_description='',
     author='LightStep',