diff --git a/build.gradle b/build.gradle
index 974b807..68ec4fc 100644
--- a/build.gradle
+++ b/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.9.1'
+        classpath 'com.android.tools.build:gradle:9.2.1'
     }
 }
 
diff --git a/gradle.properties b/gradle.properties
index 340f070..5bac8ac 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1 @@
-android.enableJetifier=true
 android.useAndroidX=true
-android.defaults.buildfeatures.buildconfig=true
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index c642711..068ffe2 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.4.1-all.zip
diff --git a/usbSerialExamples/build.gradle b/usbSerialExamples/build.gradle
index e7957f6..6f4ad75 100644
--- a/usbSerialExamples/build.gradle
+++ b/usbSerialExamples/build.gradle
@@ -24,6 +24,9 @@ android {
         }
     }
     namespace 'com.hoho.android.usbserial.examples'
+    buildFeatures {
+        buildConfig true
+    }
 }
 
 dependencies {
diff --git a/usbSerialForAndroid/build.gradle b/usbSerialForAndroid/build.gradle
index 76b85fa..3e3e26a 100644
--- a/usbSerialForAndroid/build.gradle
+++ b/usbSerialForAndroid/build.gradle
@@ -28,17 +28,20 @@ android {
             withSourcesJar()
         }
     }
+    buildFeatures {
+        buildConfig true
+    }
 }
 
 dependencies {
-    implementation "androidx.annotation:annotation:1.9.1"
+    implementation "androidx.annotation:annotation:1.10.0"
     testImplementation 'junit:junit:4.13.2'
-    testImplementation 'org.mockito:mockito-core:5.15.2'
+    testImplementation 'org.mockito:mockito-core:5.17.0' // later versions require new Java version: Unsupported class file major version 68
     androidTestImplementation 'androidx.appcompat:appcompat:1.6.1' // later versions have minsdk 21
     androidTestImplementation 'androidx.test:core:1.5.0' // later versions have minsdk 19
     androidTestImplementation 'androidx.test:runner:1.5.2' // later versions have minsdk 19
     androidTestImplementation 'commons-net:commons-net:3.9.0' // later versions fail on old Android devices with missing java.time.Duration class
-    androidTestImplementation 'org.apache.commons:commons-lang3:3.14.0'
+    androidTestImplementation 'org.apache.commons:commons-lang3:3.20.0'
 }
 
 // gradle task: publishToMavenLocal