diff --git a/dropdown_button/android/gradle/wrapper/gradle-wrapper.properties b/dropdown_button/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/dropdown_button/android/gradle/wrapper/gradle-wrapper.properties
+++ b/dropdown_button/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/enabling_splash_screen/android/gradle/wrapper/gradle-wrapper.properties b/enabling_splash_screen/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/enabling_splash_screen/android/gradle/wrapper/gradle-wrapper.properties
+++ b/enabling_splash_screen/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/expense_planner/android/build.gradle b/expense_planner/android/build.gradle
index 3d5a126..852f581 100644
--- a/expense_planner/android/build.gradle
+++ b/expense_planner/android/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.3.71'
+    ext.kotlin_version = '1.3.72'
     repositories {
         google()
         jcenter()
diff --git a/expense_planner/android/gradle/wrapper/gradle-wrapper.properties b/expense_planner/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/expense_planner/android/gradle/wrapper/gradle-wrapper.properties
+++ b/expense_planner/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/google_signin/android/gradle/wrapper/gradle-wrapper.properties b/google_signin/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/google_signin/android/gradle/wrapper/gradle-wrapper.properties
+++ b/google_signin/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/grid_layout/android/gradle/wrapper/gradle-wrapper.properties b/grid_layout/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/grid_layout/android/gradle/wrapper/gradle-wrapper.properties
+++ b/grid_layout/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/handling_routes/android/gradle/wrapper/gradle-wrapper.properties b/handling_routes/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/handling_routes/android/gradle/wrapper/gradle-wrapper.properties
+++ b/handling_routes/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/image_from_network/android/gradle/wrapper/gradle-wrapper.properties b/image_from_network/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/image_from_network/android/gradle/wrapper/gradle-wrapper.properties
+++ b/image_from_network/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/infinite_list/android/gradle/wrapper/gradle-wrapper.properties b/infinite_list/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/infinite_list/android/gradle/wrapper/gradle-wrapper.properties
+++ b/infinite_list/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/load_local_image/android/gradle/wrapper/gradle-wrapper.properties b/load_local_image/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/load_local_image/android/gradle/wrapper/gradle-wrapper.properties
+++ b/load_local_image/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/load_local_json/android/gradle/wrapper/gradle-wrapper.properties b/load_local_json/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/load_local_json/android/gradle/wrapper/gradle-wrapper.properties
+++ b/load_local_json/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/navigation_drawer/android/gradle/wrapper/gradle-wrapper.properties b/navigation_drawer/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/navigation_drawer/android/gradle/wrapper/gradle-wrapper.properties
+++ b/navigation_drawer/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/persist_key_value/android/build.gradle b/persist_key_value/android/build.gradle
index 3d5a126..852f581 100644
--- a/persist_key_value/android/build.gradle
+++ b/persist_key_value/android/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.3.71'
+    ext.kotlin_version = '1.3.72'
     repositories {
         google()
         jcenter()
diff --git a/persist_key_value/android/gradle/wrapper/gradle-wrapper.properties b/persist_key_value/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/persist_key_value/android/gradle/wrapper/gradle-wrapper.properties
+++ b/persist_key_value/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/simple_material_app/android/gradle/wrapper/gradle-wrapper.properties b/simple_material_app/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/simple_material_app/android/gradle/wrapper/gradle-wrapper.properties
+++ b/simple_material_app/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/stateful_widget/android/gradle/wrapper/gradle-wrapper.properties b/stateful_widget/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/stateful_widget/android/gradle/wrapper/gradle-wrapper.properties
+++ b/stateful_widget/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/stateless_widgets/android/gradle/wrapper/gradle-wrapper.properties b/stateless_widgets/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/stateless_widgets/android/gradle/wrapper/gradle-wrapper.properties
+++ b/stateless_widgets/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/tip_calculator/android/gradle/wrapper/gradle-wrapper.properties b/tip_calculator/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/tip_calculator/android/gradle/wrapper/gradle-wrapper.properties
+++ b/tip_calculator/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/using_alert_dialog/android/gradle/wrapper/gradle-wrapper.properties b/using_alert_dialog/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/using_alert_dialog/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_alert_dialog/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/using_bottom_nav_bar/android/gradle/wrapper/gradle-wrapper.properties b/using_bottom_nav_bar/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/using_bottom_nav_bar/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_bottom_nav_bar/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/using_custom_fonts/android/gradle/wrapper/gradle-wrapper.properties b/using_custom_fonts/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/using_custom_fonts/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_custom_fonts/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/using_edittext/android/gradle/wrapper/gradle-wrapper.properties b/using_edittext/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/using_edittext/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_edittext/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/using_firebase_db/android/gradle/wrapper/gradle-wrapper.properties b/using_firebase_db/android/gradle/wrapper/gradle-wrapper.properties
index f0a1f85..90f271d 100644
--- a/using_firebase_db/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_firebase_db/android/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-6.2.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
diff --git a/using_gradient/android/gradle/wrapper/gradle-wrapper.properties b/using_gradient/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/using_gradient/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_gradient/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/using_http_get/android/gradle/wrapper/gradle-wrapper.properties b/using_http_get/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/using_http_get/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_http_get/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/using_listview/android/gradle/wrapper/gradle-wrapper.properties b/using_listview/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/using_listview/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_listview/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/using_snackbar/android/gradle/wrapper/gradle-wrapper.properties b/using_snackbar/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/using_snackbar/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_snackbar/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/using_stepper/android/gradle/wrapper/gradle-wrapper.properties b/using_stepper/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/using_stepper/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_stepper/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/using_tabs/android/gradle/wrapper/gradle-wrapper.properties b/using_tabs/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/using_tabs/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_tabs/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/using_theme/android/gradle/wrapper/gradle-wrapper.properties b/using_theme/android/gradle/wrapper/gradle-wrapper.properties
index 6623300..186b715 100644
--- a/using_theme/android/gradle/wrapper/gradle-wrapper.properties
+++ b/using_theme/android/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists