diff --git a/CHANGELOG.md b/CHANGELOG.md
index 144846d1c6..a29751d70d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.27.0](https://www.github.com/googleapis/gapic-generator-python/compare/v0.26.6...v0.27.0) (2020-07-13)
+
+
+### Features
+
+* support for proto3 optional fields ([#519](https://www.github.com/googleapis/gapic-generator-python/issues/519)) ([1aa729c](https://www.github.com/googleapis/gapic-generator-python/commit/1aa729cc8d2f7f0de25c8348fdbf9d6dd96f5847))
+
 ### [0.26.6](https://www.github.com/googleapis/gapic-generator-python/compare/v0.26.5...v0.26.6) (2020-07-10)
 
 
diff --git a/setup.py b/setup.py
index cac6481b70..1764dc1e53 100644
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
 
 PACKAGE_ROOT = os.path.abspath(os.path.dirname(__file__))
 
-version = "0.26.6"
+version = "0.27.0"
 
 with io.open(os.path.join(PACKAGE_ROOT, "README.rst")) as file_obj:
     README = file_obj.read()