diff --git a/CHANGELOG.md b/CHANGELOG.md
index d038a97..8a5240b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 2.1.1
+* Fix calling `setUserId` with null crashes on iOS.
+
 ## 2.1.0
 * Fix the crash when calling `setUserProperties`
 * Add API `uploadEvents` to force uploading unsent events. 
diff --git a/example/pubspec.lock b/example/pubspec.lock
index e38c3c4..19e5d8d 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -7,7 +7,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "2.0.0"
+    version: "2.1.1"
   async:
     dependency: transitive
     description:
diff --git a/lib/constants.dart b/lib/constants.dart
index ddd789b..529fc6f 100644
--- a/lib/constants.dart
+++ b/lib/constants.dart
@@ -1,4 +1,4 @@
 class Constants {
   static const packageName = 'amplitude-flutter';
-  static const packageVersion = '2.1.0';
+  static const packageVersion = '2.1.1';
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index f4bec10..c0f274a 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: amplitude_flutter
 description: Amplitude Flutter plugin
-version: 2.1.0
+version: 2.1.1
 homepage: https://www.amplitude.com
 
 environment: