diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index 0437e435c7b..0a444c8176f 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-b305eb63378016cea07f0ebed9c8fe04e2621261
+4c573207acc373fbb88cc98feb15678d0acdabcb
diff --git a/packages/animations/example/android/build.gradle b/packages/animations/example/android/build.gradle
index b4ef1adb402..2092f9d1d7b 100644
--- a/packages/animations/example/android/build.gradle
+++ b/packages/animations/example/android/build.gradle
@@ -2,7 +2,7 @@ buildscript {
     ext.kotlin_version = '1.6.0'
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     dependencies {
@@ -14,7 +14,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/packages/flutter_markdown/example/android/build.gradle b/packages/flutter_markdown/example/android/build.gradle
index f132e37ee36..9e8dea7d36d 100644
--- a/packages/flutter_markdown/example/android/build.gradle
+++ b/packages/flutter_markdown/example/android/build.gradle
@@ -2,7 +2,7 @@ buildscript {
     ext.kotlin_version = '1.6.0'
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     dependencies {
@@ -14,7 +14,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/packages/go_router_builder/test/test_inputs/_go_router_builder_test_input.dart b/packages/go_router_builder/test/test_inputs/_go_router_builder_test_input.dart
index 4ef46f1d2ad..03a7dedd350 100644
--- a/packages/go_router_builder/test/test_inputs/_go_router_builder_test_input.dart
+++ b/packages/go_router_builder/test/test_inputs/_go_router_builder_test_input.dart
@@ -9,7 +9,9 @@ import 'package:source_gen_test/annotations.dart';
 @TypedGoRoute(path: 'bob') // ignore: invalid_annotation_target
 const int theAnswer = 42;
 
+// This test should be removed: dart enforces the `required` keyword.
 @ShouldThrow('Missing `path` value on annotation.')
+// ignore:missing_required_argument
 @TypedGoRoute()
 class MissingPathValue extends GoRouteData {}
 
diff --git a/packages/imitation_game/imitation_tests/smiley/android/build.gradle b/packages/imitation_game/imitation_tests/smiley/android/build.gradle
index 067a3626102..31cb0e75dd0 100644
--- a/packages/imitation_game/imitation_tests/smiley/android/build.gradle
+++ b/packages/imitation_game/imitation_tests/smiley/android/build.gradle
@@ -4,8 +4,7 @@ buildscript {
     ext.kotlin_version = '1.3.61'
     repositories {
         google()
-        jcenter()
-        
+        mavenCentral()
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.6.2'
@@ -19,8 +18,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
-        
+        mavenCentral()
     }
 }
 
diff --git a/packages/imitation_game/imitation_tests/smiley/flutter/smiley/android/build.gradle b/packages/imitation_game/imitation_tests/smiley/flutter/smiley/android/build.gradle
index b4ef1adb402..2092f9d1d7b 100644
--- a/packages/imitation_game/imitation_tests/smiley/flutter/smiley/android/build.gradle
+++ b/packages/imitation_game/imitation_tests/smiley/flutter/smiley/android/build.gradle
@@ -2,7 +2,7 @@ buildscript {
     ext.kotlin_version = '1.6.0'
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     dependencies {
@@ -14,7 +14,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/packages/palette_generator/example/android/build.gradle b/packages/palette_generator/example/android/build.gradle
index e0d7ae2c11a..456d020f6e2 100644
--- a/packages/palette_generator/example/android/build.gradle
+++ b/packages/palette_generator/example/android/build.gradle
@@ -1,7 +1,7 @@
 buildscript {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     dependencies {
@@ -12,7 +12,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/packages/pigeon/e2e_tests/test_objc/android/build.gradle b/packages/pigeon/e2e_tests/test_objc/android/build.gradle
index b4ef1adb402..2092f9d1d7b 100644
--- a/packages/pigeon/e2e_tests/test_objc/android/build.gradle
+++ b/packages/pigeon/e2e_tests/test_objc/android/build.gradle
@@ -2,7 +2,7 @@ buildscript {
     ext.kotlin_version = '1.6.0'
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     dependencies {
@@ -14,7 +14,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/packages/pigeon/platform_tests/android_unit_tests/android/build.gradle b/packages/pigeon/platform_tests/android_unit_tests/android/build.gradle
index 30053837a61..410e2c749c2 100644
--- a/packages/pigeon/platform_tests/android_unit_tests/android/build.gradle
+++ b/packages/pigeon/platform_tests/android_unit_tests/android/build.gradle
@@ -2,7 +2,7 @@ buildscript {
     ext.kotlin_version = '1.6.0'
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     dependencies {
@@ -14,7 +14,7 @@ buildscript {
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
     gradle.projectsEvaluated {
         tasks.withType(JavaCompile) {