diff --git a/packages/cloud_functions/cloud_functions/android/build.gradle b/packages/cloud_functions/cloud_functions/android/build.gradle
index 9d1295a9567c..0e60c55e34f4 100644
--- a/packages/cloud_functions/cloud_functions/android/build.gradle
+++ b/packages/cloud_functions/cloud_functions/android/build.gradle
@@ -4,14 +4,18 @@ version '1.0-SNAPSHOT'
 apply plugin: 'com.android.library'
 apply from: file("local-config.gradle")
 
-// AGP 9+ has built-in Kotlin support; older versions need the plugin explicitly.
+// AGP 9+ has built-in Kotlin support unless Flutter opts out via android.builtInKotlin=false.
 def agpMajor = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION.tokenize('.')[0] as int
-if (agpMajor < 9) {
+def builtInKotlin = providers.gradleProperty("android.builtInKotlin")
+        .map { it.toBoolean() }
+        .orElse(agpMajor >= 9)
+        .get()
+if (agpMajor < 9 || !builtInKotlin) {
   apply plugin: 'kotlin-android'
 }
 
 buildscript {
-  ext.kotlin_version = "1.8.22"
+  ext.kotlin_version = "2.0.0"
   repositories {
     google()
     mavenCentral()
@@ -61,12 +65,6 @@ android {
       targetCompatibility project.ext.javaVersion
   }
 
-  if (agpMajor < 9) {
-    kotlinOptions {
-      jvmTarget = project.ext.javaVersion
-    }
-  }
-
   sourceSets {
     main.java.srcDirs += "src/main/kotlin"
     test.java.srcDirs += "src/test/kotlin"
@@ -90,4 +88,12 @@ android {
 
 }
 
+plugins.withId("org.jetbrains.kotlin.android") {
+  kotlin {
+    compilerOptions {
+      jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.fromTarget(project.ext.javaVersion.toString())
+    }
+  }
+}
+
 apply from: file("./user-agent.gradle")
\ No newline at end of file
diff --git a/packages/firebase_ai/firebase_ai/android/build.gradle b/packages/firebase_ai/firebase_ai/android/build.gradle
index 13affc9f6740..278104b4b9c2 100644
--- a/packages/firebase_ai/firebase_ai/android/build.gradle
+++ b/packages/firebase_ai/firebase_ai/android/build.gradle
@@ -4,9 +4,13 @@ version '1.0-SNAPSHOT'
 apply plugin: 'com.android.library'
 apply from: file("local-config.gradle")
 
-// AGP 9+ has built-in Kotlin support; older versions need the plugin explicitly.
+// AGP 9+ has built-in Kotlin support unless Flutter opts out via android.builtInKotlin=false.
 def agpMajor = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION.tokenize('.')[0] as int
-if (agpMajor < 9) {
+def builtInKotlin = providers.gradleProperty("android.builtInKotlin")
+        .map { it.toBoolean() }
+        .orElse(agpMajor >= 9)
+        .get()
+if (agpMajor < 9 || !builtInKotlin) {
   apply plugin: 'kotlin-android'
 }
 
@@ -33,12 +37,6 @@ android {
         targetCompatibility project.ext.javaVersion
     }
 
-    if (agpMajor < 9) {
-      kotlinOptions {
-          jvmTarget = project.ext.javaVersion
-      }
-    }
-
     sourceSets {
         main.java.srcDirs += "src/main/kotlin"
     }
@@ -47,3 +45,11 @@ android {
         disable 'InvalidPackage'
     }
 }
+
+plugins.withId("org.jetbrains.kotlin.android") {
+  kotlin {
+    compilerOptions {
+      jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.fromTarget(project.ext.javaVersion.toString())
+    }
+  }
+}
diff --git a/packages/firebase_analytics/firebase_analytics/android/build.gradle b/packages/firebase_analytics/firebase_analytics/android/build.gradle
index 183ea4605c04..189e57e43906 100755
--- a/packages/firebase_analytics/firebase_analytics/android/build.gradle
+++ b/packages/firebase_analytics/firebase_analytics/android/build.gradle
@@ -5,7 +5,7 @@ apply plugin: 'com.android.library'
 apply from: file("local-config.gradle")
 
 buildscript {
-    ext.kotlin_version = "1.8.22"
+    ext.kotlin_version = "2.0.0"
     repositories {
         google()
         mavenCentral()
@@ -26,9 +26,13 @@ rootProject.allprojects {
 
 apply plugin: 'com.android.library'
 
-// AGP 9+ has built-in Kotlin support; older versions need the plugin explicitly.
+// AGP 9+ has built-in Kotlin support unless Flutter opts out via android.builtInKotlin=false.
 def agpMajor = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION.tokenize('.')[0] as int
-if (agpMajor < 9) {
+def builtInKotlin = providers.gradleProperty("android.builtInKotlin")
+        .map { it.toBoolean() }
+        .orElse(agpMajor >= 9)
+        .get()
+if (agpMajor < 9 || !builtInKotlin) {
     apply plugin: 'kotlin-android'
 }
 
@@ -58,12 +62,6 @@ android {
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
-    if (agpMajor < 9) {
-        kotlinOptions {
-            jvmTarget = project.ext.javaVersion
-        }
-    }
-
     compileOptions {
         sourceCompatibility project.ext.javaVersion
         targetCompatibility project.ext.javaVersion
@@ -90,4 +88,12 @@ android {
     }
 }
 
+plugins.withId("org.jetbrains.kotlin.android") {
+    kotlin {
+        compilerOptions {
+            jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.fromTarget(project.ext.javaVersion.toString())
+        }
+    }
+}
+
 apply from: file("./user-agent.gradle")
\ No newline at end of file
diff --git a/packages/firebase_app_check/firebase_app_check/android/build.gradle b/packages/firebase_app_check/firebase_app_check/android/build.gradle
index 45c2fa4d6345..d4fdbc15fca9 100644
--- a/packages/firebase_app_check/firebase_app_check/android/build.gradle
+++ b/packages/firebase_app_check/firebase_app_check/android/build.gradle
@@ -5,7 +5,7 @@ apply plugin: 'com.android.library'
 apply from: file("local-config.gradle")
 
 buildscript {
-  ext.kotlin_version = "1.8.22"
+  ext.kotlin_version = "2.0.0"
   repositories {
     google()
     mavenCentral()
@@ -19,9 +19,13 @@ rootProject.allprojects {
   }
 }
 
-// AGP 9+ has built-in Kotlin support; older versions need the plugin explicitly.
+// AGP 9+ has built-in Kotlin support unless Flutter opts out via android.builtInKotlin=false.
 def agpMajor = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION.tokenize('.')[0] as int
-if (agpMajor < 9) {
+def builtInKotlin = providers.gradleProperty("android.builtInKotlin")
+        .map { it.toBoolean() }
+        .orElse(agpMajor >= 9)
+        .get()
+if (agpMajor < 9 || !builtInKotlin) {
     apply plugin: 'kotlin-android'
 }
 
@@ -51,12 +55,6 @@ android {
     testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
   }
 
-  if (agpMajor < 9) {
-    kotlinOptions {
-      jvmTarget = project.ext.javaVersion
-    }
-  }
-
   compileOptions {
     sourceCompatibility project.ext.javaVersion
     targetCompatibility project.ext.javaVersion
@@ -84,4 +82,12 @@ android {
   }
 }
 
+plugins.withId("org.jetbrains.kotlin.android") {
+  kotlin {
+    compilerOptions {
+      jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.fromTarget(project.ext.javaVersion.toString())
+    }
+  }
+}
+
 apply from: file("./user-agent.gradle")
diff --git a/packages/firebase_database/firebase_database/android/build.gradle b/packages/firebase_database/firebase_database/android/build.gradle
index 4826a7d16f7a..a0db4c898a25 100755
--- a/packages/firebase_database/firebase_database/android/build.gradle
+++ b/packages/firebase_database/firebase_database/android/build.gradle
@@ -4,9 +4,13 @@ version '1.0-SNAPSHOT'
 apply plugin: 'com.android.library'
 apply from: file("local-config.gradle")
 
-// AGP 9+ has built-in Kotlin support; older versions need the plugin explicitly.
+// AGP 9+ has built-in Kotlin support unless Flutter opts out via android.builtInKotlin=false.
 def agpMajor = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION.tokenize('.')[0] as int
-if (agpMajor < 9) {
+def builtInKotlin = providers.gradleProperty("android.builtInKotlin")
+        .map { it.toBoolean() }
+        .orElse(agpMajor >= 9)
+        .get()
+if (agpMajor < 9 || !builtInKotlin) {
     apply plugin: 'kotlin-android'
 }
 
@@ -55,12 +59,6 @@ android {
         targetCompatibility project.ext.javaVersion
     }
 
-    if (agpMajor < 9) {
-        kotlinOptions {
-            jvmTarget = project.ext.javaVersion
-        }
-    }
-
     sourceSets {
         main {
             java {
@@ -85,5 +83,13 @@ android {
     }
 }
 
+plugins.withId("org.jetbrains.kotlin.android") {
+    kotlin {
+        compilerOptions {
+            jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.fromTarget(project.ext.javaVersion.toString())
+        }
+    }
+}
+
 apply from: file("./user-agent.gradle")
 
diff --git a/packages/firebase_performance/firebase_performance/android/build.gradle b/packages/firebase_performance/firebase_performance/android/build.gradle
index 6d38c5620117..5f74989e1448 100644
--- a/packages/firebase_performance/firebase_performance/android/build.gradle
+++ b/packages/firebase_performance/firebase_performance/android/build.gradle
@@ -4,14 +4,18 @@ version '1.0-SNAPSHOT'
 apply plugin: 'com.android.library'
 apply from: file("local-config.gradle")
 
-// AGP 9+ has built-in Kotlin support; older versions need the plugin explicitly.
+// AGP 9+ has built-in Kotlin support unless Flutter opts out via android.builtInKotlin=false.
 def agpMajor = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION.tokenize('.')[0] as int
-if (agpMajor < 9) {
+def builtInKotlin = providers.gradleProperty("android.builtInKotlin")
+        .map { it.toBoolean() }
+        .orElse(agpMajor >= 9)
+        .get()
+if (agpMajor < 9 || !builtInKotlin) {
     apply plugin: 'kotlin-android'
 }
 
 buildscript {
-    ext.kotlin_version = "1.8.22"
+    ext.kotlin_version = "2.0.0"
 
     repositories {
         google()
@@ -60,12 +64,6 @@ android {
         targetCompatibility project.ext.javaVersion
     }
 
-    if (agpMajor < 9) {
-        kotlinOptions {
-            jvmTarget = project.ext.javaVersion
-        }
-    }
-
     sourceSets {
         main.java.srcDirs += "src/main/kotlin"
         test.java.srcDirs += "src/test/kotlin"
@@ -87,4 +85,12 @@ android {
     }
 }
 
+plugins.withId("org.jetbrains.kotlin.android") {
+    kotlin {
+        compilerOptions {
+            jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.fromTarget(project.ext.javaVersion.toString())
+        }
+    }
+}
+
 apply from: file("./user-agent.gradle")
diff --git a/packages/firebase_remote_config/firebase_remote_config/android/build.gradle b/packages/firebase_remote_config/firebase_remote_config/android/build.gradle
index a03f8e444446..d2a0aa74e23c 100644
--- a/packages/firebase_remote_config/firebase_remote_config/android/build.gradle
+++ b/packages/firebase_remote_config/firebase_remote_config/android/build.gradle
@@ -5,7 +5,7 @@ apply plugin: 'com.android.library'
 apply from: file("local-config.gradle")
 
 buildscript {
-    ext.kotlin_version = "1.8.22"
+    ext.kotlin_version = "2.0.0"
     repositories {
         google()
         mavenCentral()
@@ -19,9 +19,13 @@ rootProject.allprojects {
     }
 }
 
-// AGP 9+ has built-in Kotlin support; older versions need the plugin explicitly.
+// AGP 9+ has built-in Kotlin support unless Flutter opts out via android.builtInKotlin=false.
 def agpMajor = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION.tokenize('.')[0] as int
-if (agpMajor < 9) {
+def builtInKotlin = providers.gradleProperty("android.builtInKotlin")
+        .map { it.toBoolean() }
+        .orElse(agpMajor >= 9)
+        .get()
+if (agpMajor < 9 || !builtInKotlin) {
     apply plugin: 'kotlin-android'
 }
 
@@ -51,12 +55,6 @@ android {
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
-    if (agpMajor < 9) {
-        kotlinOptions {
-            jvmTarget = project.ext.javaVersion
-        }
-    }
-
     compileOptions {
         sourceCompatibility project.ext.javaVersion
         targetCompatibility project.ext.javaVersion
@@ -83,4 +81,12 @@ android {
     }
 }
 
+plugins.withId("org.jetbrains.kotlin.android") {
+    kotlin {
+        compilerOptions {
+            jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.fromTarget(project.ext.javaVersion.toString())
+        }
+    }
+}
+
 apply from: file("./user-agent.gradle")
diff --git a/packages/firebase_storage/firebase_storage/android/build.gradle b/packages/firebase_storage/firebase_storage/android/build.gradle
index c9e5b5e5940d..f041bc40275b 100755
--- a/packages/firebase_storage/firebase_storage/android/build.gradle
+++ b/packages/firebase_storage/firebase_storage/android/build.gradle
@@ -5,7 +5,7 @@ apply plugin: 'com.android.library'
 apply from: file("local-config.gradle")
 
 buildscript {
-    ext.kotlin_version = "1.8.22"
+    ext.kotlin_version = "2.0.0"
     repositories {
         google()
         mavenCentral()
@@ -44,9 +44,13 @@ def getRootProjectExtOrCoreProperty(name, firebaseCoreProject) {
     return rootProject.ext.get('FlutterFire').get(name)
 }
 
-// AGP 9+ has built-in Kotlin support; older versions need the plugin explicitly.
+// AGP 9+ has built-in Kotlin support unless Flutter opts out via android.builtInKotlin=false.
 def agpMajor = com.android.Version.ANDROID_GRADLE_PLUGIN_VERSION.tokenize('.')[0] as int
-if (agpMajor < 9) {
+def builtInKotlin = providers.gradleProperty("android.builtInKotlin")
+        .map { it.toBoolean() }
+        .orElse(agpMajor >= 9)
+        .get()
+if (agpMajor < 9 || !builtInKotlin) {
     apply plugin: 'kotlin-android'
 }
 
@@ -63,12 +67,6 @@ android {
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
-    if (agpMajor < 9) {
-        kotlinOptions {
-            jvmTarget = project.ext.javaVersion
-        }
-    }
-
     compileOptions {
         sourceCompatibility project.ext.javaVersion
         targetCompatibility project.ext.javaVersion
@@ -95,4 +93,12 @@ android {
     }
 }
 
+plugins.withId("org.jetbrains.kotlin.android") {
+    kotlin {
+        compilerOptions {
+            jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.fromTarget(project.ext.javaVersion.toString())
+        }
+    }
+}
+
 apply from: file("./user-agent.gradle")