diff --git a/android/build.gradle b/android/build.gradle
index 62a9496..eca1c5f 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -34,7 +34,7 @@ android {
         main.java.srcDirs += 'src/main/kotlin'
     }
     defaultConfig {
-        minSdkVersion 21
+        minSdkVersion 24
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     lintOptions {
@@ -47,5 +47,5 @@ android {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation "com.journeyapps:zxing-android-embedded:3.5.0"
+    implementation "com.journeyapps:zxing-android-embedded:4.0.2"
 }
diff --git a/example/android/app/build.gradle b/example/android/app/build.gradle
index 9625d92..a213fe1 100644
--- a/example/android/app/build.gradle
+++ b/example/android/app/build.gradle
@@ -39,7 +39,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "net.touchcapture.qr.flutterqrexample"
-        minSdkVersion 21
+        minSdkVersion 24
         targetSdkVersion 27
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName