diff --git a/android/build.gradle b/android/build.gradle
index 4e8106c..6fd0249 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -1,5 +1,5 @@
 group 'io.flutterfastkit.fk_user_agent'
-version '2.0.0'
+version '2.1.1'
 
 buildscript {
     repositories {
@@ -22,6 +22,11 @@ rootProject.allprojects {
 apply plugin: 'com.android.library'
 
 android {
+    // Conditional for compatibility with AGP <4.2.
+    if (project.android.hasProperty("namespace")) {
+        namespace 'io.flutterfastkit.fk_user_agent'
+    }
+    
     compileSdkVersion 30
 
     defaultConfig {
diff --git a/pubspec.yaml b/pubspec.yaml
index f3e54f6..73ab968 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: fk_user_agent
 description: Retrieve Android/iOS device user agents in Flutter.
-version: 2.1.0
+version: 2.1.1
 homepage: https://github.com/flutter-fast-kit/fk_user_agent
 
 environment: