diff --git a/examples/DemoRunner/Builds/Android/app/CMakeLists.txt b/examples/DemoRunner/Builds/Android/app/CMakeLists.txt
index 67b3abd007..e52d8c09fd 100644
--- a/examples/DemoRunner/Builds/Android/app/CMakeLists.txt
+++ b/examples/DemoRunner/Builds/Android/app/CMakeLists.txt
@@ -8,7 +8,7 @@ SET(BINARY_NAME "juce_jni")
 add_library("cpufeatures" STATIC "${ANDROID_NDK}/sources/android/cpufeatures/cpu-features.c")
 set_source_files_properties("${ANDROID_NDK}/sources/android/cpufeatures/cpu-features.c" PROPERTIES COMPILE_FLAGS "-Wno-sign-conversion -Wno-gnu-statement-expression")
 
-add_definitions("-DJUCE_ANDROID=1" "-DJUCE_ANDROID_API_VERSION=23" "-DJUCE_PUSH_NOTIFICATIONS=1" "-DJUCE_PUSH_NOTIFICATIONS_ACTIVITY=\"com/roli/juce/JuceActivity\"" "-DJUCE_ANDROID_GL_ES_VERSION_3_0=1" "-DJUCE_DEMO_RUNNER=1" "-DJUCE_UNIT_TESTS=1" "-DJUCER_ANDROIDSTUDIO_7F0E4A25=1" "-DJUCE_APP_VERSION=5.4.5" "-DJUCE_APP_VERSION_HEX=0x50405")
+add_definitions("-DJUCE_ANDROID=1" "-DJUCE_ANDROID_API_VERSION=23" "-DJUCE_PUSH_NOTIFICATIONS=1" "-DJUCE_PUSH_NOTIFICATIONS_ACTIVITY=\"com/roli/juce/JuceActivity\"" "-DJUCE_IN_APP_PURCHASES=1" "-DJUCE_ANDROID_GL_ES_VERSION_3_0=1" "-DJUCE_DEMO_RUNNER=1" "-DJUCE_UNIT_TESTS=1" "-DJUCER_ANDROIDSTUDIO_7F0E4A25=1" "-DJUCE_APP_VERSION=5.4.5" "-DJUCE_APP_VERSION_HEX=0x50405")
 
 include_directories( AFTER
     "../../../JuceLibraryCode"
diff --git a/examples/DemoRunner/Builds/Android/app/build.gradle b/examples/DemoRunner/Builds/Android/app/build.gradle
index 0081e10bcc..cfec92a480 100644
--- a/examples/DemoRunner/Builds/Android/app/build.gradle
+++ b/examples/DemoRunner/Builds/Android/app/build.gradle
@@ -87,6 +87,7 @@ android {
             ["../../../../../modules/juce_core/native/javacore/init",
              "../../../../../modules/juce_core/native/javacore/app",
              "../../../../../modules/juce_gui_basics/native/javacore/app",
+             "../../../../../modules/juce_product_unlocking/native/javacore/app",
              "../../../../../modules/juce_gui_basics/native/javaopt/app"]
 
         main.res.srcDirs +=
@@ -97,6 +98,7 @@ android {
     }
 
     dependencies {
+        implementation 'com.android.billingclient:billing:2.1.0'
     }
 
 
diff --git a/examples/DemoRunner/Builds/Android/app/src/main/AndroidManifest.xml b/examples/DemoRunner/Builds/Android/app/src/main/AndroidManifest.xml
index 80922f549e..6c7ad0e4bf 100644
--- a/examples/DemoRunner/Builds/Android/app/src/main/AndroidManifest.xml
+++ b/examples/DemoRunner/Builds/Android/app/src/main/AndroidManifest.xml
@@ -3,6 +3,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="5.4.5"
           package="com.juce.demorunner">
   <supports-screens android:smallScreens="true" android:normalScreens="true" android:largeScreens="true" android:anyDensity="true"/>
+  <uses-permission android:name="com.android.vending.BILLING"/>
   <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
   <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
   <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
diff --git a/examples/DemoRunner/Builds/Android/build.gradle b/examples/DemoRunner/Builds/Android/build.gradle
index 2df9a8e707..cfd3a2f8b5 100644
--- a/examples/DemoRunner/Builds/Android/build.gradle
+++ b/examples/DemoRunner/Builds/Android/build.gradle
@@ -4,7 +4,7 @@ buildscript {
        jcenter()
    }
    dependencies {
-       classpath 'com.android.tools.build:gradle:3.2.1'
+       classpath 'com.android.tools.build:gradle:3.5.3'
    }
 }
 
diff --git a/examples/DemoRunner/Builds/Android/gradle/wrapper/gradle-wrapper.properties b/examples/DemoRunner/Builds/Android/gradle/wrapper/gradle-wrapper.properties
index b460908d4f..b66802c714 100644
--- a/examples/DemoRunner/Builds/Android/gradle/wrapper/gradle-wrapper.properties
+++ b/examples/DemoRunner/Builds/Android/gradle/wrapper/gradle-wrapper.properties
@@ -1 +1 @@
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10-all.zip
\ No newline at end of file
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
\ No newline at end of file
diff --git a/extras/AudioPerformanceTest/Builds/Android/build.gradle b/extras/AudioPerformanceTest/Builds/Android/build.gradle
index 2df9a8e707..cfd3a2f8b5 100644
--- a/extras/AudioPerformanceTest/Builds/Android/build.gradle
+++ b/extras/AudioPerformanceTest/Builds/Android/build.gradle
@@ -4,7 +4,7 @@ buildscript {
        jcenter()
    }
    dependencies {
-       classpath 'com.android.tools.build:gradle:3.2.1'
+       classpath 'com.android.tools.build:gradle:3.5.3'
    }
 }
 
diff --git a/extras/AudioPerformanceTest/Builds/Android/gradle/wrapper/gradle-wrapper.properties b/extras/AudioPerformanceTest/Builds/Android/gradle/wrapper/gradle-wrapper.properties
index b460908d4f..b66802c714 100644
--- a/extras/AudioPerformanceTest/Builds/Android/gradle/wrapper/gradle-wrapper.properties
+++ b/extras/AudioPerformanceTest/Builds/Android/gradle/wrapper/gradle-wrapper.properties
@@ -1 +1 @@
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10-all.zip
\ No newline at end of file
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
\ No newline at end of file
diff --git a/extras/AudioPluginHost/Builds/Android/build.gradle b/extras/AudioPluginHost/Builds/Android/build.gradle
index 2df9a8e707..cfd3a2f8b5 100644
--- a/extras/AudioPluginHost/Builds/Android/build.gradle
+++ b/extras/AudioPluginHost/Builds/Android/build.gradle
@@ -4,7 +4,7 @@ buildscript {
        jcenter()
    }
    dependencies {
-       classpath 'com.android.tools.build:gradle:3.2.1'
+       classpath 'com.android.tools.build:gradle:3.5.3'
    }
 }
 
diff --git a/extras/AudioPluginHost/Builds/Android/gradle/wrapper/gradle-wrapper.properties b/extras/AudioPluginHost/Builds/Android/gradle/wrapper/gradle-wrapper.properties
index b460908d4f..b66802c714 100644
--- a/extras/AudioPluginHost/Builds/Android/gradle/wrapper/gradle-wrapper.properties
+++ b/extras/AudioPluginHost/Builds/Android/gradle/wrapper/gradle-wrapper.properties
@@ -1 +1 @@
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10-all.zip
\ No newline at end of file
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
\ No newline at end of file
diff --git a/extras/NetworkGraphicsDemo/Builds/Android/build.gradle b/extras/NetworkGraphicsDemo/Builds/Android/build.gradle
index 2df9a8e707..cfd3a2f8b5 100644
--- a/extras/NetworkGraphicsDemo/Builds/Android/build.gradle
+++ b/extras/NetworkGraphicsDemo/Builds/Android/build.gradle
@@ -4,7 +4,7 @@ buildscript {
        jcenter()
    }
    dependencies {
-       classpath 'com.android.tools.build:gradle:3.2.1'
+       classpath 'com.android.tools.build:gradle:3.5.3'
    }
 }
 
diff --git a/extras/NetworkGraphicsDemo/Builds/Android/gradle/wrapper/gradle-wrapper.properties b/extras/NetworkGraphicsDemo/Builds/Android/gradle/wrapper/gradle-wrapper.properties
index b460908d4f..b66802c714 100644
--- a/extras/NetworkGraphicsDemo/Builds/Android/gradle/wrapper/gradle-wrapper.properties
+++ b/extras/NetworkGraphicsDemo/Builds/Android/gradle/wrapper/gradle-wrapper.properties
@@ -1 +1 @@
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10-all.zip
\ No newline at end of file
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
\ No newline at end of file