diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70c7c35fa1..58b780c9cf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 # Unreleased
 
+* Bump: sentry-android to v4.3.0 (#343)
+
 # 4.1.0-nullsafety.0
 
 * Fix: Do not append stack trace to the exception if there are no frames
diff --git a/flutter/android/build.gradle b/flutter/android/build.gradle
index a8e6f98b11..f9fa2f9846 100644
--- a/flutter/android/build.gradle
+++ b/flutter/android/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.4.10'
+    ext.kotlin_version = '1.4.31'
     repositories {
         google()
         jcenter()
@@ -54,6 +54,6 @@ android {
 }
 
 dependencies {
-    api 'io.sentry:sentry-android:4.0.0'
+    api 'io.sentry:sentry-android:4.3.0'
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
 }
diff --git a/flutter/android/proguard-rules.pro b/flutter/android/proguard-rules.pro
index a01311c578..d64759b4c6 100644
--- a/flutter/android/proguard-rules.pro
+++ b/flutter/android/proguard-rules.pro
@@ -1 +1,5 @@
 -keep class io.sentry.flutter.** { *; }
+
+# To ensure that stack traces is unambiguous
+# https://developer.android.com/studio/build/shrink-code#decode-stack-trace
+-keepattributes LineNumberTable,SourceFile
diff --git a/flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt b/flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt
index 2a6aaa3a1f..335638ccb8 100644
--- a/flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt
+++ b/flutter/android/src/main/kotlin/io/sentry/flutter/SentryFlutterPlugin.kt
@@ -87,7 +87,7 @@ class SentryFlutterPlugin : FlutterPlugin, MethodCallHandler {
       args.getIfNotNull<Int>("maxBreadcrumbs") { options.maxBreadcrumbs = it }
       args.getIfNotNull<Int>("cacheDirSize") { options.cacheDirSize = it }
       args.getIfNotNull<String>("diagnosticLevel") {
-        if (options.isDebug == true) {
+        if (options.isDebug) {
           val sentryLevel = SentryLevel.valueOf(it.toUpperCase(Locale.ROOT))
           options.setDiagnosticLevel(sentryLevel)
         }
@@ -97,7 +97,7 @@ class SentryFlutterPlugin : FlutterPlugin, MethodCallHandler {
       val nativeCrashHandling = (args["enableNativeCrashHandling"] as? Boolean) ?: true
       // nativeCrashHandling has priority over anrEnabled
       if (!nativeCrashHandling) {
-        options.setEnableUncaughtExceptionHandler(false)
+        options.enableUncaughtExceptionHandler = false
         options.isAnrEnabled = false
         // if split symbols are enabled, we need Ndk integration so we can't really offer the option
         // to turn it off
@@ -168,12 +168,12 @@ class SentryFlutterPlugin : FlutterPlugin, MethodCallHandler {
   private val nativeSdk = "sentry.native"
 
   private fun setEventOriginTag(event: SentryEvent) {
-    val sdk = event.sdk
-    if (isValidSdk(sdk)) {
-      when (sdk!!.name) {
+    event.sdk?.let {
+      when (it.name) {
         flutterSdk -> setEventEnvironmentTag(event, "flutter", "dart")
         androidSdk -> setEventEnvironmentTag(event, environment = "java")
         nativeSdk -> setEventEnvironmentTag(event, environment = "native")
+        else -> return
       }
     }
   }
@@ -183,30 +183,24 @@ class SentryFlutterPlugin : FlutterPlugin, MethodCallHandler {
     event.setTag("event.environment", environment)
   }
 
-  private fun isValidSdk(sdk: SdkVersion?): Boolean {
-    return (sdk != null && !sdk.name.isNullOrEmpty())
-  }
-
   private fun addPackages(event: SentryEvent, sdk: SdkVersion?) {
-    if (isValidSdk(event.sdk)) {
-      when (event.sdk!!.name) {
-        flutterSdk -> {
-          sdk?.packages?.forEach { sentryPackage ->
-            event.sdk?.addPackage(sentryPackage.name, sentryPackage.version)
-          }
-          sdk?.integrations?.forEach { integration ->
-            event.sdk?.addIntegration(integration)
-          }
+    event.sdk?.let {
+      if (it.name == flutterSdk) {
+        sdk?.packages?.forEach { sentryPackage ->
+          it.addPackage(sentryPackage.name, sentryPackage.version)
+        }
+        sdk?.integrations?.forEach { integration ->
+          it.addIntegration(integration)
         }
       }
     }
   }
 
   private fun removeThreadsIfNotAndroid(event: SentryEvent) {
-    if (isValidSdk(event.sdk)) {
+    event.sdk?.let {
       // we do not want the thread list if not an android event, the thread info is mostly about
       // the file observer anyway
-      if (event.sdk!!.name != androidSdk && event.threads != null) {
+      if (it.name != androidSdk && event.threads != null) {
         event.threads.clear()
       }
     }