diff --git a/packages/gradle-plugin/gradle/libs.versions.toml b/packages/gradle-plugin/gradle/libs.versions.toml
index c5621244b1f8..d1c7721fa70f 100644
--- a/packages/gradle-plugin/gradle/libs.versions.toml
+++ b/packages/gradle-plugin/gradle/libs.versions.toml
@@ -4,7 +4,7 @@ gson = "2.8.9"
 guava = "31.0.1-jre"
 javapoet = "1.13.0"
 junit = "4.13.2"
-kotlin = "2.3.21"
+kotlin = "2.4.21"
 assertj = "3.25.1"
 
 [libraries]
diff --git a/packages/gradle-plugin/react-native-gradle-plugin/build.gradle.kts b/packages/gradle-plugin/react-native-gradle-plugin/build.gradle.kts
index 78a8e7508f33..c4e52f9367a6 100644
--- a/packages/gradle-plugin/react-native-gradle-plugin/build.gradle.kts
+++ b/packages/gradle-plugin/react-native-gradle-plugin/build.gradle.kts
@@ -64,6 +64,8 @@ kotlin { jvmToolchain(17) }
 tasks.withType<KotlinCompile>().configureEach {
   compilerOptions {
     apiVersion.set(KotlinVersion.KOTLIN_2_1)
+    // Remove this suppression in RN 0.90 when the Kotlin API version can be raised.
+    freeCompilerArgs.add("-Xwarning-level=DEPRECATED_LANGUAGE_VERSION:disabled")
     // See comment above on JDK 11 support
     jvmTarget.set(JvmTarget.JVM_11)
     allWarningsAsErrors.set(
diff --git a/packages/gradle-plugin/settings-plugin/build.gradle.kts b/packages/gradle-plugin/settings-plugin/build.gradle.kts
index c1c86c34f05d..3bf6beb7cc10 100644
--- a/packages/gradle-plugin/settings-plugin/build.gradle.kts
+++ b/packages/gradle-plugin/settings-plugin/build.gradle.kts
@@ -54,6 +54,8 @@ kotlin { jvmToolchain(17) }
 tasks.withType<KotlinCompile>().configureEach {
   compilerOptions {
     apiVersion.set(KotlinVersion.KOTLIN_2_1)
+    // Remove this suppression in RN 0.90 when the Kotlin API version can be raised.
+    freeCompilerArgs.add("-Xwarning-level=DEPRECATED_LANGUAGE_VERSION:disabled")
     // See comment above on JDK 11 support
     jvmTarget.set(JvmTarget.JVM_11)
     allWarningsAsErrors.set(
diff --git a/packages/gradle-plugin/shared-testutil/build.gradle.kts b/packages/gradle-plugin/shared-testutil/build.gradle.kts
index 8f1b90907823..71b4885a67d8 100644
--- a/packages/gradle-plugin/shared-testutil/build.gradle.kts
+++ b/packages/gradle-plugin/shared-testutil/build.gradle.kts
@@ -25,6 +25,8 @@ kotlin { jvmToolchain(17) }
 tasks.withType<KotlinCompile>().configureEach {
   compilerOptions {
     apiVersion.set(KotlinVersion.KOTLIN_2_1)
+    // Remove this suppression in RN 0.90 when the Kotlin API version can be raised.
+    freeCompilerArgs.add("-Xwarning-level=DEPRECATED_LANGUAGE_VERSION:disabled")
     // See comment above on JDK 11 support
     jvmTarget.set(JvmTarget.JVM_11)
     allWarningsAsErrors.set(
diff --git a/packages/gradle-plugin/shared/build.gradle.kts b/packages/gradle-plugin/shared/build.gradle.kts
index 7b4d96ff6677..790bf0e11fc0 100644
--- a/packages/gradle-plugin/shared/build.gradle.kts
+++ b/packages/gradle-plugin/shared/build.gradle.kts
@@ -31,6 +31,8 @@ kotlin { jvmToolchain(17) }
 tasks.withType<KotlinCompile>().configureEach {
   compilerOptions {
     apiVersion.set(KotlinVersion.KOTLIN_2_1)
+    // Remove this suppression in RN 0.90 when the Kotlin API version can be raised.
+    freeCompilerArgs.add("-Xwarning-level=DEPRECATED_LANGUAGE_VERSION:disabled")
     // See comment above on JDK 11 support
     jvmTarget.set(JvmTarget.JVM_11)
     allWarningsAsErrors.set(
diff --git a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextDecorationStyleTest.kt b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextDecorationStyleTest.kt
index ebf45d24eb62..9e28610a0159 100644
--- a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextDecorationStyleTest.kt
+++ b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextDecorationStyleTest.kt
@@ -28,13 +28,11 @@ import org.mockito.kotlin.verify
 import org.robolectric.RobolectricTestRunner
 import org.robolectric.annotation.Config
 import org.robolectric.annotation.GraphicsMode
-import org.robolectric.annotation.TextLayoutMode
 
 @RequiresApi(Build.VERSION_CODES.Q)
 @RunWith(RobolectricTestRunner::class)
 @Config(sdk = [Build.VERSION_CODES.UPSIDE_DOWN_CAKE, Build.VERSION_CODES.VANILLA_ICE_CREAM])
 @GraphicsMode(GraphicsMode.Mode.NATIVE)
-@TextLayoutMode(TextLayoutMode.Mode.REALISTIC)
 class TextDecorationStyleTest {
   @Test
   fun fromStringSolid() {
diff --git a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextLayoutManagerFontSizeToFitPixelHeightTest.kt b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextLayoutManagerFontSizeToFitPixelHeightTest.kt
index ce2669d8b388..f7fc2ab1d646 100644
--- a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextLayoutManagerFontSizeToFitPixelHeightTest.kt
+++ b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextLayoutManagerFontSizeToFitPixelHeightTest.kt
@@ -26,11 +26,9 @@ import org.junit.runner.RunWith
 import org.robolectric.RobolectricTestRunner
 import org.robolectric.RuntimeEnvironment
 import org.robolectric.annotation.GraphicsMode
-import org.robolectric.annotation.TextLayoutMode
 
 @RunWith(RobolectricTestRunner::class)
 @GraphicsMode(GraphicsMode.Mode.NATIVE)
-@TextLayoutMode(TextLayoutMode.Mode.REALISTIC)
 @SuppressLint("InlinedApi")
 class TextLayoutManagerFontSizeToFitPixelHeightTest {
 
diff --git a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextLayoutManagerPixelWidthTest.kt b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextLayoutManagerPixelWidthTest.kt
index a42a4ee2e401..dbcdacaaa74d 100644
--- a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextLayoutManagerPixelWidthTest.kt
+++ b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/text/TextLayoutManagerPixelWidthTest.kt
@@ -20,11 +20,9 @@ import org.junit.Test
 import org.junit.runner.RunWith
 import org.robolectric.RobolectricTestRunner
 import org.robolectric.annotation.GraphicsMode
-import org.robolectric.annotation.TextLayoutMode
 
 @RunWith(RobolectricTestRunner::class)
 @GraphicsMode(GraphicsMode.Mode.NATIVE)
-@TextLayoutMode(TextLayoutMode.Mode.REALISTIC)
 class TextLayoutManagerPixelWidthTest {
   private val text = SpannableString("Add payment method")
   private val paint = TextPaint(TextPaint.ANTI_ALIAS_FLAG).apply { textSize = 16f }
diff --git a/packages/react-native/gradle/libs.versions.toml b/packages/react-native/gradle/libs.versions.toml
index 35407c86b177..d3bf8e02259d 100644
--- a/packages/react-native/gradle/libs.versions.toml
+++ b/packages/react-native/gradle/libs.versions.toml
@@ -31,7 +31,7 @@ javax-inject = "1"
 jsc-android = "2026004.0.1"
 jsr305 = "3.0.2"
 junit = "4.13.2"
-kotlin = "2.3.21"
+kotlin = "2.4.21"
 mockito = "3.12.4"
 mockito-kotlin = "3.2.0"
 nexus-publish = "2.0.0"
diff --git a/private/helloworld/android/build.gradle b/private/helloworld/android/build.gradle
index 419eda091165..934993a031a9 100644
--- a/private/helloworld/android/build.gradle
+++ b/private/helloworld/android/build.gradle
@@ -12,7 +12,7 @@ buildscript {
         compileSdkVersion = 37
         targetSdkVersion = 35
         ndkVersion = "28.2.13676358"
-        kotlinVersion = "2.3.21"
+        kotlinVersion = "2.4.21"
     }
     repositories {
         google()