diff --git a/tutorials/kotlin/Polygons/app/build.gradle b/tutorials/kotlin/Polygons/app/build.gradle
index acaec5bd..051b82a3 100644
--- a/tutorials/kotlin/Polygons/app/build.gradle
+++ b/tutorials/kotlin/Polygons/app/build.gradle
@@ -29,7 +29,7 @@ dependencies {
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
-    implementation "androidx.core:core-ktx:1.8.0"
+    implementation "androidx.core:core-ktx:1.9.0"
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 }