diff --git a/pkg/vm/testcases/transformations/type_flow/transformer/protobuf_handler/compile_protos.sh b/pkg/vm/testcases/transformations/type_flow/transformer/protobuf_handler/compile_protos.sh
index 8031891c8b7..d4f63559974 100755
--- a/pkg/vm/testcases/transformations/type_flow/transformer/protobuf_handler/compile_protos.sh
+++ b/pkg/vm/testcases/transformations/type_flow/transformer/protobuf_handler/compile_protos.sh
@@ -16,4 +16,4 @@ GENERATED_DIR=$DIR/lib/generated
 protoc --dart_out=$GENERATED_DIR -I$DIR/protos $DIR/protos/*.proto
 rm $GENERATED_DIR/*.pbenum.dart $GENERATED_DIR/*.pbjson.dart $GENERATED_DIR/*.pbserver.dart
 
-dartfmt -w $DIR/lib/generated
+dart format $DIR/lib/generated
diff --git a/pkg/vm_service/tool/generate.dart b/pkg/vm_service/tool/generate.dart
index b9ef51f7534..79d74eb5c2c 100644
--- a/pkg/vm_service/tool/generate.dart
+++ b/pkg/vm_service/tool/generate.dart
@@ -46,9 +46,9 @@ Future _generateDart(String appDirPath, List<Node> nodes) async {
   dart.api.parse(nodes);
   dart.api.generate(generator);
   outputFile.writeAsStringSync(generator.toString());
-  ProcessResult result = Process.runSync('dartfmt', ['-w', outDirPath]);
+  ProcessResult result = Process.runSync('dart', ['format', outDirPath]);
   if (result.exitCode != 0) {
-    print('dartfmt: ${result.stdout}\n${result.stderr}');
+    print('dart format: ${result.stdout}\n${result.stderr}');
     throw result.exitCode;
   }
 
@@ -103,9 +103,9 @@ Future _generateAsserts(String appDirPath, List<Node> nodes) async {
   dart.api.parse(nodes);
   dart.api.generateAsserts(generator);
   outputFile.writeAsStringSync(generator.toString());
-  ProcessResult result = Process.runSync('dartfmt', ['-w', outDirPath]);
+  ProcessResult result = Process.runSync('dart', ['format', outDirPath]);
   if (result.exitCode != 0) {
-    print('dartfmt: ${result.stdout}\n${result.stderr}');
+    print('dart format: ${result.stdout}\n${result.stderr}');
     throw result.exitCode;
   }
 
diff --git a/runtime/observatory/tool/ensure_dartfmt.sh b/runtime/observatory/tool/ensure_dartfmt.sh
index 6aa50e98d57..0579debc1c8 100755
--- a/runtime/observatory/tool/ensure_dartfmt.sh
+++ b/runtime/observatory/tool/ensure_dartfmt.sh
@@ -3,13 +3,13 @@
 dart_files=$(find lib web -name "*.dart")
 [ -z "$dart_files" ] && exit 0
 
-unformatted=$(dartfmt -n $dart_files)
+unformatted=$(dart format -o none $dart_files)
 [ -z "$unformatted" ] && exit 0
 
-# Some files are not dartfmt'd. Print message and fail.
-echo >&2 "dart files must be formatted with dartfmt. Please run:"
+# Some files are not dart formatted. Print message and fail.
+echo >&2 "dart files must be formatted with dart format. Please run:"
 for fn in $unformatted; do
-  echo >&2 "  dartfmt -w $PWD/$fn"
+  echo >&2 "  dart format $PWD/$fn"
 done
 
 exit 1
diff --git a/runtime/observatory_2/tool/ensure_dartfmt.sh b/runtime/observatory_2/tool/ensure_dartfmt.sh
index 6aa50e98d57..0579debc1c8 100755
--- a/runtime/observatory_2/tool/ensure_dartfmt.sh
+++ b/runtime/observatory_2/tool/ensure_dartfmt.sh
@@ -3,13 +3,13 @@
 dart_files=$(find lib web -name "*.dart")
 [ -z "$dart_files" ] && exit 0
 
-unformatted=$(dartfmt -n $dart_files)
+unformatted=$(dart format -o none $dart_files)
 [ -z "$unformatted" ] && exit 0
 
-# Some files are not dartfmt'd. Print message and fail.
-echo >&2 "dart files must be formatted with dartfmt. Please run:"
+# Some files are not dart formatted. Print message and fail.
+echo >&2 "dart files must be formatted with dart format. Please run:"
 for fn in $unformatted; do
-  echo >&2 "  dartfmt -w $PWD/$fn"
+  echo >&2 "  dart format $PWD/$fn"
 done
 
 exit 1
diff --git a/runtime/tests/concurrency/generate_stress_test.dart b/runtime/tests/concurrency/generate_stress_test.dart
index 3870ef2f989..a22bc342953 100644
--- a/runtime/tests/concurrency/generate_stress_test.dart
+++ b/runtime/tests/concurrency/generate_stress_test.dart
@@ -17,7 +17,7 @@ final generatedNnbdTest =
 final Map testMap = json.decode(File(stressTestListJson).readAsStringSync());
 final testFiles = testMap['non-nnbd'].cast<String>();
 final testFilesNnbd = testMap['nnbd'].cast<String>();
-final dartfmt = 'tools/sdks/dart-sdk/bin/dartfmt';
+final dart = 'tools/sdks/dart-sdk/bin/dart';
 
 main(List<String> args) async {
   File(generatedNnbdTest)
@@ -188,7 +188,7 @@ main() async {
 
 Future<String> format(String generatedSource) async {
   try {
-    final result = await Process.start(dartfmt, []);
+    final result = await Process.start(dart, ['format']);
     result.stdin.writeln(generatedSource);
 
     final results = await Future.wait([
@@ -200,13 +200,14 @@ Future<String> format(String generatedSource) async {
 
     final exitCode = results[3] as int;
     if (exitCode != 0) {
-      print('Note: Failed to format source code. Dartfmt exited non-0.');
+      print('Note: Failed to format source code. Dart format exited non-0.');
       return generatedSource;
     }
     final stdout = results[1] as String;
     final stderr = results[2] as String;
     if (stderr.trim().length != 0) {
-      print('Note: Failed to format source code. Dartfmt had stderr: $stderr');
+      print('Note: Failed to format source code. Dart format had stderr: '
+          '$stderr');
       return generatedSource;
     }
     return stdout;
diff --git a/runtime/tools/dartfuzz/gen_type_table.dart b/runtime/tools/dartfuzz/gen_type_table.dart
index 0f2599a4662..6bd642e7dfb 100644
--- a/runtime/tools/dartfuzz/gen_type_table.dart
+++ b/runtime/tools/dartfuzz/gen_type_table.dart
@@ -8,7 +8,7 @@
 //   dart gen_type_table.dart > dartfuzz_type_table.dart
 //
 // Reformat:
-//   tools/sdks/dart-sdk/bin/dartfmt -w \
+//   tools/sdks/dart-sdk/bin/dart format \
 //   runtime/tools/dartfuzz/dartfuzz_type_table.dart
 //
 // Then send out modified dartfuzz_type_table.dart for review together