diff --git a/bench/android/full-app/app/build.gradle b/bench/android/full-app/app/build.gradle
index 695c0e5..d704185 100644
--- a/bench/android/full-app/app/build.gradle
+++ b/bench/android/full-app/app/build.gradle
@@ -82,7 +82,7 @@ configurations.all {
 
 dependencies {
     implementation 'androidx.appcompat:appcompat:1.8.0'
-    implementation 'org.jetbrains.kotlin:kotlin-stdlib:2.4.20'
+    implementation 'org.jetbrains.kotlin:kotlin-stdlib:2.4.21'
 
     // issue #136 goal 4 — a real (non-Android-stub) org.json so the matcher-vs-TS agreement
     // check (KotlinMatcherAgreementTest, a local JVM unit test — no device/emulator needed) can
diff --git a/bench/android/full-app/build.gradle b/bench/android/full-app/build.gradle
index 7833ecb..a282ffe 100644
--- a/bench/android/full-app/build.gradle
+++ b/bench/android/full-app/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:8.7.3'
-        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:2.4.20'
+        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:2.4.21'
     }
 }
 
diff --git a/bench/android/sherpa-onnx/app/build.gradle b/bench/android/sherpa-onnx/app/build.gradle
index e302bb1..4cb72b6 100644
--- a/bench/android/sherpa-onnx/app/build.gradle
+++ b/bench/android/sherpa-onnx/app/build.gradle
@@ -33,5 +33,5 @@ android {
 
 dependencies {
     implementation 'androidx.appcompat:appcompat:1.8.0'
-    implementation 'org.jetbrains.kotlin:kotlin-stdlib:2.4.20'
+    implementation 'org.jetbrains.kotlin:kotlin-stdlib:2.4.21'
 }
diff --git a/bench/android/sherpa-onnx/build.gradle b/bench/android/sherpa-onnx/build.gradle
index 7833ecb..a282ffe 100644
--- a/bench/android/sherpa-onnx/build.gradle
+++ b/bench/android/sherpa-onnx/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:8.7.3'
-        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:2.4.20'
+        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:2.4.21'
     }
 }