diff --git a/HelloSharedPrefs/app/build.gradle b/HelloSharedPrefs/app/build.gradle
index f943273..a4dbd4c 100644
--- a/HelloSharedPrefs/app/build.gradle
+++ b/HelloSharedPrefs/app/build.gradle
@@ -1,14 +1,14 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 29
     defaultConfig {
         applicationId "com.example.android.hellosharedprefs"
         minSdkVersion 16
-        targetSdkVersion 27
+        targetSdkVersion 29
         versionCode 1
         versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
     }
     buildTypes {
         release {
@@ -20,9 +20,9 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'com.android.support:appcompat-v7:27.1.1'
-    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
-    testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'com.android.support.test:runner:1.0.2'
-    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    testImplementation 'junit:junit:4.13'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
 }
diff --git a/HelloSharedPrefs/app/src/main/java/com/example/android/hellosharedprefs/MainActivity.java b/HelloSharedPrefs/app/src/main/java/com/example/android/hellosharedprefs/MainActivity.java
index b7b08c8..5bc6e27 100644
--- a/HelloSharedPrefs/app/src/main/java/com/example/android/hellosharedprefs/MainActivity.java
+++ b/HelloSharedPrefs/app/src/main/java/com/example/android/hellosharedprefs/MainActivity.java
@@ -16,8 +16,8 @@
 package com.example.android.hellosharedprefs;
 
 import android.graphics.drawable.ColorDrawable;
-import android.support.v4.content.ContextCompat;
-import android.support.v7.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
+import androidx.appcompat.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.TextView;
diff --git a/HelloSharedPrefs/app/src/main/res/layout/activity_main.xml b/HelloSharedPrefs/app/src/main/res/layout/activity_main.xml
index 289c2f2..5315f86 100644
--- a/HelloSharedPrefs/app/src/main/res/layout/activity_main.xml
+++ b/HelloSharedPrefs/app/src/main/res/layout/activity_main.xml
@@ -14,7 +14,7 @@
   See the License for the specific language governing permissions and
   limitations under the License.
   -->
-<android.support.constraint.ConstraintLayout
+<androidx.constraintlayout.widget.ConstraintLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
@@ -38,7 +38,7 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"/>
 
-    <android.support.constraint.Guideline
+    <androidx.constraintlayout.widget.Guideline
         android:id="@+id/guideline_upper"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -98,7 +98,7 @@
         app:layout_constraintStart_toEndOf="@+id/blue_background_button"
         app:layout_constraintTop_toTopOf="@+id/guideline_upper"/>
 
-    <android.support.constraint.Guideline
+    <androidx.constraintlayout.widget.Guideline
         android:id="@+id/guideline_lower"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
@@ -132,4 +132,4 @@
         app:layout_constraintStart_toEndOf="@+id/count_button"
         app:layout_constraintTop_toBottomOf="@+id/guideline_lower"/>
 
-</android.support.constraint.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/HelloSharedPrefs/build.gradle b/HelloSharedPrefs/build.gradle
index 1a3d812..2426268 100644
--- a/HelloSharedPrefs/build.gradle
+++ b/HelloSharedPrefs/build.gradle
@@ -7,7 +7,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.2'
+        classpath 'com.android.tools.build:gradle:4.1.1'
         
 
         // NOTE: Do not place your application dependencies here; they belong
diff --git a/HelloSharedPrefs/gradle.properties b/HelloSharedPrefs/gradle.properties
index 743d692..8de5058 100644
--- a/HelloSharedPrefs/gradle.properties
+++ b/HelloSharedPrefs/gradle.properties
@@ -6,6 +6,8 @@
 # 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.
+android.enableJetifier=true
+android.useAndroidX=true
 org.gradle.jvmargs=-Xmx1536m
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
diff --git a/HelloSharedPrefs/gradle/wrapper/gradle-wrapper.properties b/HelloSharedPrefs/gradle/wrapper/gradle-wrapper.properties
index 9ccce64..dc2ef3d 100644
--- a/HelloSharedPrefs/gradle/wrapper/gradle-wrapper.properties
+++ b/HelloSharedPrefs/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Mon Jul 02 14:40:58 PDT 2018
+#Mon Dec 28 13:39:37 CST 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
diff --git a/MaterialMe-Starter/app/build.gradle b/MaterialMe-Starter/app/build.gradle
index 0c41e29..6c0f893 100755
--- a/MaterialMe-Starter/app/build.gradle
+++ b/MaterialMe-Starter/app/build.gradle
@@ -1,12 +1,12 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 29
 
     defaultConfig {
         applicationId "com.ngamolsky.android.materialme"
         minSdkVersion 15
-        targetSdkVersion 27
+        targetSdkVersion 29
         versionCode 1
         versionName "1.0"
     }
@@ -20,7 +20,7 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    testImplementation 'junit:junit:4.12'
-    implementation 'com.android.support:appcompat-v7:27.1.1'
-    implementation 'com.android.support:recyclerview-v7:27.1.1'
+    testImplementation 'junit:junit:4.13'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.recyclerview:recyclerview:1.1.0'
 }
diff --git a/MaterialMe-Starter/app/src/main/java/com/example/android/materialme/MainActivity.java b/MaterialMe-Starter/app/src/main/java/com/example/android/materialme/MainActivity.java
index 50f6e9a..b3d890e 100755
--- a/MaterialMe-Starter/app/src/main/java/com/example/android/materialme/MainActivity.java
+++ b/MaterialMe-Starter/app/src/main/java/com/example/android/materialme/MainActivity.java
@@ -17,9 +17,9 @@
 package com.example.android.materialme;
 
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
-import android.support.v7.widget.LinearLayoutManager;
-import android.support.v7.widget.RecyclerView;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
 
 import java.util.ArrayList;
 
diff --git a/MaterialMe-Starter/app/src/main/java/com/example/android/materialme/SportsAdapter.java b/MaterialMe-Starter/app/src/main/java/com/example/android/materialme/SportsAdapter.java
index 73ef25d..331c291 100755
--- a/MaterialMe-Starter/app/src/main/java/com/example/android/materialme/SportsAdapter.java
+++ b/MaterialMe-Starter/app/src/main/java/com/example/android/materialme/SportsAdapter.java
@@ -17,7 +17,7 @@
 package com.example.android.materialme;
 
 import android.content.Context;
-import android.support.v7.widget.RecyclerView;
+import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
diff --git a/MaterialMe-Starter/app/src/main/res/layout/activity_main.xml b/MaterialMe-Starter/app/src/main/res/layout/activity_main.xml
index 97aa058..3588262 100755
--- a/MaterialMe-Starter/app/src/main/res/layout/activity_main.xml
+++ b/MaterialMe-Starter/app/src/main/res/layout/activity_main.xml
@@ -24,7 +24,7 @@
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.example.android.materialme.MainActivity">
 
-    <android.support.v7.widget.RecyclerView
+    <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/recyclerView"
         android:scrollbars="vertical"
         android:layout_width="match_parent"
diff --git a/MaterialMe-Starter/build.gradle b/MaterialMe-Starter/build.gradle
index 55db43f..c95742a 100755
--- a/MaterialMe-Starter/build.gradle
+++ b/MaterialMe-Starter/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.4'
+        classpath 'com.android.tools.build:gradle:4.1.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/MaterialMe-Starter/gradle.properties b/MaterialMe-Starter/gradle.properties
index 1d3591c..acf164f 100755
--- a/MaterialMe-Starter/gradle.properties
+++ b/MaterialMe-Starter/gradle.properties
@@ -15,4 +15,6 @@
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
-# org.gradle.parallel=true
\ No newline at end of file
+# org.gradle.parallel=true
+android.enableJetifier=true
+android.useAndroidX=true
diff --git a/MaterialMe-Starter/gradle/wrapper/gradle-wrapper.properties b/MaterialMe-Starter/gradle/wrapper/gradle-wrapper.properties
index ec02d03..e34ed2a 100755
--- a/MaterialMe-Starter/gradle/wrapper/gradle-wrapper.properties
+++ b/MaterialMe-Starter/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Tue Sep 11 11:13:07 PDT 2018
+#Mon Dec 28 13:48:40 CST 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
diff --git a/PhoneNumberSpinner/app/build.gradle b/PhoneNumberSpinner/app/build.gradle
index f7a3faa..fed1f5f 100644
--- a/PhoneNumberSpinner/app/build.gradle
+++ b/PhoneNumberSpinner/app/build.gradle
@@ -1,14 +1,14 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 26
+    compileSdkVersion 29
     defaultConfig {
         applicationId "com.example.android.phonenumberspinner"
         minSdkVersion 15
-        targetSdkVersion 26
+        targetSdkVersion 29
         versionCode 1
         versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
     }
     buildTypes {
         release {
@@ -20,10 +20,10 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'com.android.support:appcompat-v7:26.1.0'
-    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
-    implementation 'com.android.support:design:26.1.0'
-    testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'com.android.support.test:runner:1.0.1'
-    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    implementation 'com.google.android.material:material:1.2.1'
+    testImplementation 'junit:junit:4.13'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
 }
diff --git a/PhoneNumberSpinner/app/src/androidTest/java/com/example/android/phonenumberspinner/ExampleInstrumentedTest.java b/PhoneNumberSpinner/app/src/androidTest/java/com/example/android/phonenumberspinner/ExampleInstrumentedTest.java
index 13f8d2b..82ab9b1 100644
--- a/PhoneNumberSpinner/app/src/androidTest/java/com/example/android/phonenumberspinner/ExampleInstrumentedTest.java
+++ b/PhoneNumberSpinner/app/src/androidTest/java/com/example/android/phonenumberspinner/ExampleInstrumentedTest.java
@@ -17,8 +17,8 @@
 package com.example.android.phonenumberspinner;
 
 import android.content.Context;
-import android.support.test.InstrumentationRegistry;
-import android.support.test.runner.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
diff --git a/PhoneNumberSpinner/app/src/main/java/com/example/android/phonenumberspinner/MainActivity.java b/PhoneNumberSpinner/app/src/main/java/com/example/android/phonenumberspinner/MainActivity.java
index 9e1e3be..252aefc 100644
--- a/PhoneNumberSpinner/app/src/main/java/com/example/android/phonenumberspinner/MainActivity.java
+++ b/PhoneNumberSpinner/app/src/main/java/com/example/android/phonenumberspinner/MainActivity.java
@@ -17,7 +17,7 @@
 package com.example.android.phonenumberspinner;
 
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatActivity;
 import android.util.Log;
 import android.view.View;
 import android.widget.AdapterView;
diff --git a/PhoneNumberSpinner/app/src/main/res/layout/activity_main.xml b/PhoneNumberSpinner/app/src/main/res/layout/activity_main.xml
index e6007f9..8d6728f 100644
--- a/PhoneNumberSpinner/app/src/main/res/layout/activity_main.xml
+++ b/PhoneNumberSpinner/app/src/main/res/layout/activity_main.xml
@@ -15,7 +15,7 @@
   ~ limitations under the License.
   -->
 
-<android.support.constraint.ConstraintLayout
+<androidx.constraintlayout.widget.ConstraintLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
@@ -69,4 +69,4 @@
         app:layout_constraintBaseline_toBaselineOf="@+id/title_phonelabel"
         app:layout_constraintStart_toEndOf="@+id/title_phonelabel" />
 
-</android.support.constraint.ConstraintLayout>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/PhoneNumberSpinner/build.gradle b/PhoneNumberSpinner/build.gradle
index e6b32bc..2426268 100644
--- a/PhoneNumberSpinner/build.gradle
+++ b/PhoneNumberSpinner/build.gradle
@@ -7,7 +7,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.1'
         
 
         // NOTE: Do not place your application dependencies here; they belong
diff --git a/PhoneNumberSpinner/gradle.properties b/PhoneNumberSpinner/gradle.properties
index aac7c9b..9e6fce1 100644
--- a/PhoneNumberSpinner/gradle.properties
+++ b/PhoneNumberSpinner/gradle.properties
@@ -9,6 +9,8 @@
 
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
+android.enableJetifier=true
+android.useAndroidX=true
 org.gradle.jvmargs=-Xmx1536m
 
 # When configured, Gradle will run in incubating parallel mode.
diff --git a/PhoneNumberSpinner/gradle/wrapper/gradle-wrapper.properties b/PhoneNumberSpinner/gradle/wrapper/gradle-wrapper.properties
index 461e904..810187e 100644
--- a/PhoneNumberSpinner/gradle/wrapper/gradle-wrapper.properties
+++ b/PhoneNumberSpinner/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Tue Nov 14 15:42:29 PST 2017
+#Mon Dec 28 13:52:51 CST 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
diff --git a/SimpleCalc/app/build.gradle b/SimpleCalc/app/build.gradle
index f9c1392..a649be1 100644
--- a/SimpleCalc/app/build.gradle
+++ b/SimpleCalc/app/build.gradle
@@ -1,15 +1,15 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 27
+    compileSdkVersion 29
 
     defaultConfig {
         applicationId "com.example.android.SimpleCalc"
         minSdkVersion 15
-        targetSdkVersion 27
+        targetSdkVersion 29
         versionCode 1
         versionName "1.0"
-        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
     }
     buildTypes {
         release {
@@ -21,8 +21,8 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'com.android.support:appcompat-v7:27.1.1'
-    implementation 'com.android.support:support-annotations:27.1.1'
-    testImplementation 'junit:junit:4.12'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+    implementation 'androidx.annotation:annotation:1.1.0'
+    testImplementation 'junit:junit:4.13'
     testImplementation 'org.hamcrest:hamcrest-library:1.3'
 }
diff --git a/SimpleCalc/build.gradle b/SimpleCalc/build.gradle
index 55db43f..c95742a 100644
--- a/SimpleCalc/build.gradle
+++ b/SimpleCalc/build.gradle
@@ -6,7 +6,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.4'
+        classpath 'com.android.tools.build:gradle:4.1.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/SimpleCalc/gradle.properties b/SimpleCalc/gradle.properties
index 1d3591c..acf164f 100644
--- a/SimpleCalc/gradle.properties
+++ b/SimpleCalc/gradle.properties
@@ -15,4 +15,6 @@
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
-# org.gradle.parallel=true
\ No newline at end of file
+# org.gradle.parallel=true
+android.enableJetifier=true
+android.useAndroidX=true
diff --git a/SimpleCalc/gradle/wrapper/gradle-wrapper.properties b/SimpleCalc/gradle/wrapper/gradle-wrapper.properties
index 51176f7..5310389 100644
--- a/SimpleCalc/gradle/wrapper/gradle-wrapper.properties
+++ b/SimpleCalc/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Tue Sep 11 11:19:59 PDT 2018
+#Mon Dec 28 13:55:42 CST 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip