diff --git a/add_to_app/fullscreen/android_fullscreen/app/build.gradle b/add_to_app/fullscreen/android_fullscreen/app/build.gradle
index cb26dce65..f1d4e6303 100644
--- a/add_to_app/fullscreen/android_fullscreen/app/build.gradle
+++ b/add_to_app/fullscreen/android_fullscreen/app/build.gradle
@@ -18,6 +18,7 @@ android {
     buildTypes {
         release {
             minifyEnabled false
+            signingConfig debug.signingConfig
         }
     }
     compileOptions {
diff --git a/add_to_app/fullscreen/android_fullscreen/build.gradle b/add_to_app/fullscreen/android_fullscreen/build.gradle
index d35e43dc9..8a9608782 100644
--- a/add_to_app/fullscreen/android_fullscreen/build.gradle
+++ b/add_to_app/fullscreen/android_fullscreen/build.gradle
@@ -7,7 +7,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.6.1'
+        classpath 'com.android.tools.build:gradle:4.1.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/add_to_app/fullscreen/android_fullscreen/gradle/wrapper/gradle-wrapper.properties b/add_to_app/fullscreen/android_fullscreen/gradle/wrapper/gradle-wrapper.properties
index 9833519b2..915e3c705 100644
--- a/add_to_app/fullscreen/android_fullscreen/gradle/wrapper/gradle-wrapper.properties
+++ b/add_to_app/fullscreen/android_fullscreen/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Wed Mar 11 09:25:37 PDT 2020
+#Mon May 17 23:38:12 PDT 2021
 distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
 distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip
+zipStoreBase=GRADLE_USER_HOME
diff --git a/add_to_app/plugin/android_using_plugin/build.gradle b/add_to_app/plugin/android_using_plugin/build.gradle
index e796b11e6..8a9608782 100644
--- a/add_to_app/plugin/android_using_plugin/build.gradle
+++ b/add_to_app/plugin/android_using_plugin/build.gradle
@@ -7,7 +7,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.1'
+        classpath 'com.android.tools.build:gradle:4.1.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/add_to_app/plugin/android_using_plugin/gradle/wrapper/gradle-wrapper.properties b/add_to_app/plugin/android_using_plugin/gradle/wrapper/gradle-wrapper.properties
index 83e0f19b1..641b07710 100644
--- a/add_to_app/plugin/android_using_plugin/gradle/wrapper/gradle-wrapper.properties
+++ b/add_to_app/plugin/android_using_plugin/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,5 @@
 #Sun Oct 13 15:03:51 PDT 2019
 distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
 distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip
diff --git a/add_to_app/prebuilt_module/android_using_prebuilt_module/build.gradle b/add_to_app/prebuilt_module/android_using_prebuilt_module/build.gradle
index 4fdf2c0c7..8a9608782 100644
--- a/add_to_app/prebuilt_module/android_using_prebuilt_module/build.gradle
+++ b/add_to_app/prebuilt_module/android_using_prebuilt_module/build.gradle
@@ -5,10 +5,9 @@ buildscript {
     repositories {
         google()
         jcenter()
-        
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.1'
+        classpath 'com.android.tools.build:gradle:4.1.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/add_to_app/prebuilt_module/android_using_prebuilt_module/gradle/wrapper/gradle-wrapper.properties b/add_to_app/prebuilt_module/android_using_prebuilt_module/gradle/wrapper/gradle-wrapper.properties
index 85a5ca2b9..4cca04ace 100644
--- a/add_to_app/prebuilt_module/android_using_prebuilt_module/gradle/wrapper/gradle-wrapper.properties
+++ b/add_to_app/prebuilt_module/android_using_prebuilt_module/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,5 @@
 #Wed Oct 23 10:17:48 PDT 2019
 distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
 distributionPath=wrapper/dists
-zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.4.1-all.zip