diff --git a/bottom_sheet/android/build.gradle b/bottom_sheet/android/build.gradle
index 3100ad2..c505a86 100644
--- a/bottom_sheet/android/build.gradle
+++ b/bottom_sheet/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/dropdown_button/android/android/build.gradle b/dropdown_button/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/dropdown_button/android/android/build.gradle
+++ b/dropdown_button/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/dropdown_button/android/build.gradle b/dropdown_button/android/build.gradle
index 205da3d..c9e3db0 100644
--- a/dropdown_button/android/build.gradle
+++ b/dropdown_button/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/enabling_splash_screen/android/android/build.gradle b/enabling_splash_screen/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/enabling_splash_screen/android/android/build.gradle
+++ b/enabling_splash_screen/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/enabling_splash_screen/android/build.gradle b/enabling_splash_screen/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/enabling_splash_screen/android/build.gradle
+++ b/enabling_splash_screen/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/expense_planner/android/android/build.gradle b/expense_planner/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/expense_planner/android/android/build.gradle
+++ b/expense_planner/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/expense_planner/android/build.gradle b/expense_planner/android/build.gradle
index fcfcd55..01f39e3 100644
--- a/expense_planner/android/build.gradle
+++ b/expense_planner/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/google_signin/android/android/build.gradle b/google_signin/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/google_signin/android/android/build.gradle
+++ b/google_signin/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/google_signin/android/build.gradle b/google_signin/android/build.gradle
index 0decefa..85e602f 100644
--- a/google_signin/android/build.gradle
+++ b/google_signin/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath 'com.google.gms:google-services:4.0.1'
     }
 }
diff --git a/grid_layout/android/android/build.gradle b/grid_layout/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/grid_layout/android/android/build.gradle
+++ b/grid_layout/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/grid_layout/android/build.gradle b/grid_layout/android/build.gradle
index 205da3d..c9e3db0 100644
--- a/grid_layout/android/build.gradle
+++ b/grid_layout/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/handling_routes/android/android/build.gradle b/handling_routes/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/handling_routes/android/android/build.gradle
+++ b/handling_routes/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/handling_routes/android/build.gradle b/handling_routes/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/handling_routes/android/build.gradle
+++ b/handling_routes/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/image_from_network/android/android/build.gradle b/image_from_network/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/image_from_network/android/android/build.gradle
+++ b/image_from_network/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/image_from_network/android/build.gradle b/image_from_network/android/build.gradle
index 205da3d..c9e3db0 100644
--- a/image_from_network/android/build.gradle
+++ b/image_from_network/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/infinite_list/android/android/build.gradle b/infinite_list/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/infinite_list/android/android/build.gradle
+++ b/infinite_list/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/infinite_list/android/build.gradle b/infinite_list/android/build.gradle
index 205da3d..c9e3db0 100644
--- a/infinite_list/android/build.gradle
+++ b/infinite_list/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/load_local_image/android/android/build.gradle b/load_local_image/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/load_local_image/android/android/build.gradle
+++ b/load_local_image/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/load_local_image/android/build.gradle b/load_local_image/android/build.gradle
index 31d0751..f69085a 100644
--- a/load_local_image/android/build.gradle
+++ b/load_local_image/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/load_local_json/android/android/build.gradle b/load_local_json/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/load_local_json/android/android/build.gradle
+++ b/load_local_json/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/load_local_json/android/build.gradle b/load_local_json/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/load_local_json/android/build.gradle
+++ b/load_local_json/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/navigation_drawer/android/android/build.gradle b/navigation_drawer/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/navigation_drawer/android/android/build.gradle
+++ b/navigation_drawer/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/navigation_drawer/android/build.gradle b/navigation_drawer/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/navigation_drawer/android/build.gradle
+++ b/navigation_drawer/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/persist_key_value/android/android/build.gradle b/persist_key_value/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/persist_key_value/android/android/build.gradle
+++ b/persist_key_value/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/persist_key_value/android/build.gradle b/persist_key_value/android/build.gradle
index fcfcd55..01f39e3 100644
--- a/persist_key_value/android/build.gradle
+++ b/persist_key_value/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/simple_material_app/android/android/build.gradle b/simple_material_app/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/simple_material_app/android/android/build.gradle
+++ b/simple_material_app/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/simple_material_app/android/build.gradle b/simple_material_app/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/simple_material_app/android/build.gradle
+++ b/simple_material_app/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/stateful_widget/android/android/build.gradle b/stateful_widget/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/stateful_widget/android/android/build.gradle
+++ b/stateful_widget/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/stateful_widget/android/build.gradle b/stateful_widget/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/stateful_widget/android/build.gradle
+++ b/stateful_widget/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/stateless_widgets/android/android/build.gradle b/stateless_widgets/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/stateless_widgets/android/android/build.gradle
+++ b/stateless_widgets/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/stateless_widgets/android/build.gradle b/stateless_widgets/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/stateless_widgets/android/build.gradle
+++ b/stateless_widgets/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/tip_calculator/android/android/build.gradle b/tip_calculator/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/tip_calculator/android/android/build.gradle
+++ b/tip_calculator/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/tip_calculator/android/build.gradle b/tip_calculator/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/tip_calculator/android/build.gradle
+++ b/tip_calculator/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/unit_testing/android/build.gradle b/unit_testing/android/build.gradle
index 3100ad2..c505a86 100644
--- a/unit_testing/android/build.gradle
+++ b/unit_testing/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_alert_dialog/android/android/build.gradle b/using_alert_dialog/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/using_alert_dialog/android/android/build.gradle
+++ b/using_alert_dialog/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_alert_dialog/android/build.gradle b/using_alert_dialog/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/using_alert_dialog/android/build.gradle
+++ b/using_alert_dialog/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/using_bottom_nav_bar/android/android/build.gradle b/using_bottom_nav_bar/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/using_bottom_nav_bar/android/android/build.gradle
+++ b/using_bottom_nav_bar/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_bottom_nav_bar/android/build.gradle b/using_bottom_nav_bar/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/using_bottom_nav_bar/android/build.gradle
+++ b/using_bottom_nav_bar/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/using_custom_fonts/android/android/build.gradle b/using_custom_fonts/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/using_custom_fonts/android/android/build.gradle
+++ b/using_custom_fonts/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_custom_fonts/android/build.gradle b/using_custom_fonts/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/using_custom_fonts/android/build.gradle
+++ b/using_custom_fonts/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/using_edittext/android/android/build.gradle b/using_edittext/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/using_edittext/android/android/build.gradle
+++ b/using_edittext/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_edittext/android/build.gradle b/using_edittext/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/using_edittext/android/build.gradle
+++ b/using_edittext/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/using_firebase_db/android/build.gradle b/using_firebase_db/android/build.gradle
index a027889..447c8f7 100644
--- a/using_firebase_db/android/build.gradle
+++ b/using_firebase_db/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath 'com.google.gms:google-services:4.3.2'
     }
 }
diff --git a/using_gradient/android/android/build.gradle b/using_gradient/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/using_gradient/android/android/build.gradle
+++ b/using_gradient/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_gradient/android/build.gradle b/using_gradient/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/using_gradient/android/build.gradle
+++ b/using_gradient/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/using_http_get/android/android/build.gradle b/using_http_get/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/using_http_get/android/android/build.gradle
+++ b/using_http_get/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_http_get/android/build.gradle b/using_http_get/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/using_http_get/android/build.gradle
+++ b/using_http_get/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/using_interactiveviewer/android/build.gradle b/using_interactiveviewer/android/build.gradle
index e0d7ae2..c9e3db0 100644
--- a/using_interactiveviewer/android/build.gradle
+++ b/using_interactiveviewer/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/using_listview/android/android/build.gradle b/using_listview/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/using_listview/android/android/build.gradle
+++ b/using_listview/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_listview/android/build.gradle b/using_listview/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/using_listview/android/build.gradle
+++ b/using_listview/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/using_snackbar/android/android/build.gradle b/using_snackbar/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/using_snackbar/android/android/build.gradle
+++ b/using_snackbar/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_snackbar/android/build.gradle b/using_snackbar/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/using_snackbar/android/build.gradle
+++ b/using_snackbar/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/using_stepper/android/android/build.gradle b/using_stepper/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/using_stepper/android/android/build.gradle
+++ b/using_stepper/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_stepper/android/build.gradle b/using_stepper/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/using_stepper/android/build.gradle
+++ b/using_stepper/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/using_tabs/android/android/build.gradle b/using_tabs/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/using_tabs/android/android/build.gradle
+++ b/using_tabs/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_tabs/android/build.gradle b/using_tabs/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/using_tabs/android/build.gradle
+++ b/using_tabs/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/using_theme/android/android/build.gradle b/using_theme/android/android/build.gradle
index 3100ad2..c505a86 100644
--- a/using_theme/android/android/build.gradle
+++ b/using_theme/android/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
diff --git a/using_theme/android/build.gradle b/using_theme/android/build.gradle
index 4b6f504..7fe1f18 100644
--- a/using_theme/android/build.gradle
+++ b/using_theme/android/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
     }
 }
 
diff --git a/view_pdf_file/android/build.gradle b/view_pdf_file/android/build.gradle
index 3100ad2..c505a86 100644
--- a/view_pdf_file/android/build.gradle
+++ b/view_pdf_file/android/build.gradle
@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }