diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4f35d67b46..bca0f77122 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,8 @@
 # Changelog
+
+## 4.2.1 (2018-01-09)
+- Misc Session Tracking fixes and enhancements
+
 ## 4.2.0 (2018-01-05)
 - Adds support for tracking sessions and overall crash rate by setting `config.setAutoCaptureSessions` to `true`.
 In addition, sessions can be indicated manually using `Bugsnag.startSession` [#217](https://github.com/bugsnag/bugsnag-android/pull/217)
diff --git a/gradle.properties b/gradle.properties
index c391408985..5285e7f4af 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -11,7 +11,7 @@ org.gradle.jvmargs=-Xmx1536m
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 # org.gradle.parallel=true
-VERSION_NAME=4.2.0
+VERSION_NAME=4.2.1
 GROUP=com.bugsnag
 POM_SCM_URL=https://github.com/bugsnag/bugsnag-android
 POM_SCM_CONNECTION=scm:git@github.com:bugsnag/bugsnag-android.git
diff --git a/sdk/src/main/java/com/bugsnag/android/Notifier.java b/sdk/src/main/java/com/bugsnag/android/Notifier.java
index 2b2d4e4c06..ee8f944893 100644
--- a/sdk/src/main/java/com/bugsnag/android/Notifier.java
+++ b/sdk/src/main/java/com/bugsnag/android/Notifier.java
@@ -9,7 +9,7 @@
  */
 public class Notifier implements JsonStream.Streamable {
     static final String NOTIFIER_NAME = "Android Bugsnag Notifier";
-    static final String NOTIFIER_VERSION = "4.2.0";
+    static final String NOTIFIER_VERSION = "4.2.1";
     static final String NOTIFIER_URL = "https://bugsnag.com";
     private String name;
     private String version;