diff --git a/gpxsee.pro b/gpxsee.pro
index 4a08909f..c3cb9e71 100644
--- a/gpxsee.pro
+++ b/gpxsee.pro
@@ -579,7 +579,6 @@ android {
     DISTFILES += \
         pkg/android/AndroidManifest.xml \
         pkg/android/build.gradle \
-        pkg/android/gradle.properties \
         pkg/android/res/values/libs.xml
 
     maps.files = $$files(pkg/maps/*)
diff --git a/pkg/android/build.gradle b/pkg/android/build.gradle
index 0a8601c4..62e78e4a 100644
--- a/pkg/android/build.gradle
+++ b/pkg/android/build.gradle
@@ -35,7 +35,8 @@ android {
      *******************************************************/
 
     compileSdkVersion androidCompileSdkVersion.toInteger()
-    buildToolsVersion androidBuildToolsVersion
+    //buildToolsVersion androidBuildToolsVersion
+    buildToolsVersion '31.0.0'
     ndkVersion androidNdkVersion
 
     sourceSets {
diff --git a/pkg/android/gradle.properties b/pkg/android/gradle.properties
deleted file mode 100644
index 76132575..00000000
--- a/pkg/android/gradle.properties
+++ /dev/null
@@ -1,17 +0,0 @@
-# Project-wide Gradle settings.
-# For more details on how to configure your build environment visit
-# http://www.gradle.org/docs/current/userguide/build_environment.html
-# Specifies the JVM arguments used for the daemon process.
-# The setting is particularly useful for tweaking memory settings.
-org.gradle.jvmargs=-Xmx2500m -XX:MaxMetaspaceSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
-
-# Enable building projects in parallel
-org.gradle.parallel=true
-
-# Gradle caching allows reusing the build artifacts from a previous
-# build with the same inputs. However, over time, the cache size will
-# grow. Uncomment the following line to enable it.
-#org.gradle.caching=true
-
-# Android compile SDK version
-android.compileSdkVersion=31