diff --git a/AnimationsInterpolatorPlayground/build.gradle b/AnimationsInterpolatorPlayground/build.gradle
index d7253487..05b5265d 100644
--- a/AnimationsInterpolatorPlayground/build.gradle
+++ b/AnimationsInterpolatorPlayground/build.gradle
@@ -3,10 +3,10 @@
 buildscript {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.2.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -16,7 +16,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/AnimationsInterpolatorPlayground/gradle/wrapper/gradle-wrapper.properties b/AnimationsInterpolatorPlayground/gradle/wrapper/gradle-wrapper.properties
index b47c75ba..d037e648 100644
--- a/AnimationsInterpolatorPlayground/gradle/wrapper/gradle-wrapper.properties
+++ b/AnimationsInterpolatorPlayground/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-5.6-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip
diff --git a/CardView/Application/build.gradle b/CardView/Application/build.gradle
index 36284f56..ff2f5e33 100644
--- a/CardView/Application/build.gradle
+++ b/CardView/Application/build.gradle
@@ -2,11 +2,11 @@
 buildscript {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.4.2'
+        classpath 'com.android.tools.build:gradle:4.2.1'
     }
 }
 
@@ -14,19 +14,11 @@ apply plugin: 'com.android.application'
 
 repositories {
     google()
-    jcenter()
+    mavenCentral()
 }
 
 dependencies {
-
-
-
-
     implementation 'com.android.support:cardview-v7:24.0.0'
-
-
-
-
 }
 
 // The sample build uses multiple directories to
diff --git a/CardView/gradle/wrapper/gradle-wrapper.properties b/CardView/gradle/wrapper/gradle-wrapper.properties
index c4486d47..1f3fdbc5 100644
--- a/CardView/gradle/wrapper/gradle-wrapper.properties
+++ b/CardView/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/CardViewKotlin/build.gradle b/CardViewKotlin/build.gradle
index 9870e4b4..77d53ba5 100644
--- a/CardViewKotlin/build.gradle
+++ b/CardViewKotlin/build.gradle
@@ -6,16 +6,16 @@ buildscript {
 
         espressoVersion = '3.0.1'
         junitVersion = '4.12'
-        kotlinVersion = '1.3.11'
+        kotlinVersion = '1.3.20'
         supportLibVersion = '27.0.2'
         supportTestVersion = '1.0.1'
     }
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath 'com.android.tools.build:gradle:4.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
     }
 }
@@ -23,7 +23,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/CardViewKotlin/gradle/wrapper/gradle-wrapper.properties b/CardViewKotlin/gradle/wrapper/gradle-wrapper.properties
index 8e7447f0..1f3fdbc5 100644
--- a/CardViewKotlin/gradle/wrapper/gradle-wrapper.properties
+++ b/CardViewKotlin/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https://services.gradle.org/distributions/gradle-5.1.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/ConstraintLayoutExamples/build.gradle b/ConstraintLayoutExamples/build.gradle
index 94cb4a49..6e30fe99 100644
--- a/ConstraintLayoutExamples/build.gradle
+++ b/ConstraintLayoutExamples/build.gradle
@@ -19,7 +19,7 @@
 buildscript {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     ext {
@@ -37,7 +37,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
 
         // NOTE: Do not place your application dependencies here; they belong
@@ -48,7 +48,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/ConstraintLayoutExamples/gradle/wrapper/gradle-wrapper.properties b/ConstraintLayoutExamples/gradle/wrapper/gradle-wrapper.properties
index 1e44cd67..01559123 100644
--- a/ConstraintLayoutExamples/gradle/wrapper/gradle-wrapper.properties
+++ b/ConstraintLayoutExamples/gradle/wrapper/gradle-wrapper.properties
@@ -19,4 +19,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip
diff --git a/DataBindingDataBoundList/app/build.gradle b/DataBindingDataBoundList/app/build.gradle
index 8286a3ef..ccd07eb2 100644
--- a/DataBindingDataBoundList/app/build.gradle
+++ b/DataBindingDataBoundList/app/build.gradle
@@ -17,13 +17,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion '25.0.0'
-    dataBinding.enabled = true
+    compileSdkVersion 30
+    buildToolsVersion '30.0.2'
+    buildFeatures.dataBinding = true
     defaultConfig {
         applicationId "com.example.android.databoundlist"
         minSdkVersion 14
-        targetSdkVersion 25
+        targetSdkVersion 28
         versionCode 1
         versionName "1.0"
     }
@@ -36,7 +36,6 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
-    testCompile 'junit:junit:4.12'
-    compile 'com.android.support:appcompat-v7:25.1.1'
+    testImplementation 'junit:junit:4.12'
+    implementation 'com.android.support:appcompat-v7:28.0.0'
 }
diff --git a/DataBindingDataBoundList/build.gradle b/DataBindingDataBoundList/build.gradle
index 2ce56aa4..11fd500c 100644
--- a/DataBindingDataBoundList/build.gradle
+++ b/DataBindingDataBoundList/build.gradle
@@ -18,10 +18,11 @@
 
 buildscript {
     repositories {
-        jcenter()
+        google()
+        mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:4.2.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -30,7 +31,8 @@ buildscript {
 
 allprojects {
     repositories {
-        jcenter()
+        google()
+        mavenCentral()
     }
 }
 
diff --git a/DataBindingDataBoundList/gradle.properties b/DataBindingDataBoundList/gradle.properties
index 9e1313bc..246a1ed5 100644
--- a/DataBindingDataBoundList/gradle.properties
+++ b/DataBindingDataBoundList/gradle.properties
@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-
 # Project-wide Gradle settings.
 
 # IDE (e.g. Android Studio) users:
diff --git a/DataBindingDataBoundList/gradle/wrapper/gradle-wrapper.properties b/DataBindingDataBoundList/gradle/wrapper/gradle-wrapper.properties
index 315e2c5a..e074e3e2 100644
--- a/DataBindingDataBoundList/gradle/wrapper/gradle-wrapper.properties
+++ b/DataBindingDataBoundList/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-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip
diff --git a/DataBindingDataBoundRecyclerView/build.gradle b/DataBindingDataBoundRecyclerView/build.gradle
index 14f08171..a393d459 100644
--- a/DataBindingDataBoundRecyclerView/build.gradle
+++ b/DataBindingDataBoundRecyclerView/build.gradle
@@ -19,10 +19,10 @@
 buildscript {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.2.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -32,6 +32,6 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
diff --git a/DataBindingDataBoundRecyclerView/gradle/wrapper/gradle-wrapper.properties b/DataBindingDataBoundRecyclerView/gradle/wrapper/gradle-wrapper.properties
index 243ff268..837eec98 100644
--- a/DataBindingDataBoundRecyclerView/gradle/wrapper/gradle-wrapper.properties
+++ b/DataBindingDataBoundRecyclerView/gradle/wrapper/gradle-wrapper.properties
@@ -13,10 +13,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+#
+#Mon Jun 07 09:36:42 PDT 2021
 
-#Mon Dec 28 10:00:20 PST 2015
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-bin.zip