diff --git a/projects/packages/masterbar/package.json b/projects/packages/masterbar/package.json
index 0403e22e7959b..114ccb5fa3351 100644
--- a/projects/packages/masterbar/package.json
+++ b/projects/packages/masterbar/package.json
@@ -1,7 +1,7 @@
 {
 	"private": true,
 	"name": "@automattic/jetpack-masterbar",
-	"version": "0.5.0",
+	"version": "0.5.1-alpha",
 	"description": "The WordPress.com Toolbar feature replaces the default admin bar and offers quick links to the Reader, all your sites, your WordPress.com profile, and notifications.",
 	"homepage": "https://github.com/Automattic/jetpack/tree/HEAD/projects/packages/masterbar/#readme",
 	"bugs": {
diff --git a/projects/packages/masterbar/src/class-main.php b/projects/packages/masterbar/src/class-main.php
index 0d6adc9f67e23..08b1a32cc9114 100644
--- a/projects/packages/masterbar/src/class-main.php
+++ b/projects/packages/masterbar/src/class-main.php
@@ -14,7 +14,7 @@
  */
 class Main {
 
-	const PACKAGE_VERSION = '0.5.0';
+	const PACKAGE_VERSION = '0.5.1-alpha';
 
 	/**
 	 * Initializer.