diff --git a/.gitignore b/.gitignore
index e79c41e..fd1f9dc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,4 @@ build
 *.iml
 *.local
 *.jks
+*.tmp
diff --git a/README.md b/README.md
index fdec169..5abc3ab 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,8 @@ This repository contains Android application sources of i2pd
 
 ### Install g++, OpenJDK 11+, gradle 5.1+
 
+ * <i>Note:</i> openjdk 17 has also been tested okay.
+
 ```bash
 sudo apt-get install g++ openjdk-11-jdk gradle
 ```
@@ -58,7 +60,7 @@ pushd binary/jni
 ./build.sh -d
 popd
 
-gradle clean assembleDebug
+./gradlew clean assembleDebug
 ```
 
 You will find APKs in `app/build/outputs/apk`
diff --git a/app/build.gradle b/app/build.gradle
index 0178977..53505f3 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -17,16 +17,12 @@ dependencies {
 }
 
 android {
-    lintOptions {
-        // Not so a good way
-        disable 'DuplicatePlatformClasses'
-    }
-
-    compileSdkVersion 33
+    // do not remove, it is deprecated & nevertheless required
+    compileSdkVersion 35
 
     defaultConfig {
         applicationId "org.purplei2p.i2pd"
-        targetSdkVersion 33
+        targetSdkVersion 35
         // TODO: 24?
         minSdkVersion 16
         versionCode 2550000
@@ -89,6 +85,12 @@ android {
         targetCompatibility = JavaVersion.VERSION_1_8
     }
     namespace 'org.purplei2p.i2pd'
+    lint {
+        disable 'DuplicatePlatformClasses'
+    }
+    buildFeatures {
+        buildConfig = true
+    }
 }
 
 ext.abiCodes = ['armeabi-v7a': 1, 'x86': 2, 'arm64-v8a': 3, 'x86_64': 4]
diff --git a/app/src/main/java/org/purplei2p/i2pd/I2PDPermsAskerActivity.java b/app/src/main/java/org/purplei2p/i2pd/I2PDPermsAskerActivity.java
index 2df2780..9ae3b3e 100644
--- a/app/src/main/java/org/purplei2p/i2pd/I2PDPermsAskerActivity.java
+++ b/app/src/main/java/org/purplei2p/i2pd/I2PDPermsAskerActivity.java
@@ -20,8 +20,6 @@
 public class I2PDPermsAskerActivity extends Activity {
 
     private static final int PERMISSION_WRITE_EXTERNAL_STORAGE = 0;
-    private static final int PERMISSION_MANAGE_EXTERNAL_STORAGE = 0;
-
     private Button button_request_write_ext_storage_perms;
     private TextView textview_retry;
 
diff --git a/build.gradle b/build.gradle
index c7da454..4dfbf30 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.3.1'
+        classpath 'com.android.tools.build:gradle:8.7.0'
     }
 }
 
diff --git a/gradle.properties b/gradle.properties
index dfb2fa4..9d65435 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,6 @@
 android.enableJetifier=true
+android.nonFinalResIds=false
+android.nonTransitiveRClass=false
 android.useAndroidX=true
 org.gradle.parallel=true
+org.gradle.jvmargs=-Xmx2048m "-XX:MaxMetaspaceSize=1024m"
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 1debed0..2fa91c5 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionSha256Sum=8cc27038d5dbd815759851ba53e70cf62e481b87494cc97cfd97982ada5ba634
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists