diff --git a/bin/internal/flutter.version b/bin/internal/flutter.version
new file mode 100644
index 00000000..fd82bdfe
--- /dev/null
+++ b/bin/internal/flutter.version
@@ -0,0 +1 @@
+45fc514f1a9c347a3af76b02baf980a4d88b7879
\ No newline at end of file
diff --git a/bin/shorebird b/bin/shorebird
index cfb4d3ac..b40bbd3c 100755
--- a/bin/shorebird
+++ b/bin/shorebird
@@ -9,6 +9,7 @@ BIN_DIR=$(cd "$(dirname "$BASH_SOURCE")"; cd -P "$(dirname "$(readlink "$BASH_SO
 PROG_NAME="$BIN_DIR/$(basename "$BASH_SOURCE")"
 OS="$(uname -s)"
 
+FLUTTER_VERSION=`cat "$BIN_DIR/internal/flutter.version"`
 source "$BIN_DIR/../third_party/flutter/bin/internal/shared.sh"
 
 # We currently depend on a forked (3.7.8 stable) Flutter shared.sh script
diff --git a/packages/shorebird_cli/lib/src/cache.dart b/packages/shorebird_cli/lib/src/cache.dart
index e5b24673..4a8d0bd6 100644
--- a/packages/shorebird_cli/lib/src/cache.dart
+++ b/packages/shorebird_cli/lib/src/cache.dart
@@ -5,7 +5,6 @@ import 'package:archive/archive_io.dart';
 import 'package:http/http.dart' as http;
 import 'package:path/path.dart' as p;
 import 'package:platform/platform.dart';
-import 'package:shorebird_cli/src/engine_revision.dart';
 import 'package:shorebird_cli/src/shorebird_environment.dart';
 
 typedef ArchiveExtracter = Future<void> Function(
@@ -137,6 +136,6 @@ class PatchArtifact extends CachedArtifact {
       artifactName += 'windows-x64.zip';
     }
 
-    return 'shorebird/$shorebirdEngineRevision/$artifactName';
+    return 'shorebird/${ShorebirdEnvironment.shorebirdEngineRevision}/$artifactName';
   }
 }
diff --git a/packages/shorebird_cli/lib/src/command_runner.dart b/packages/shorebird_cli/lib/src/command_runner.dart
index 5fb72aed..2fd8ddd3 100644
--- a/packages/shorebird_cli/lib/src/command_runner.dart
+++ b/packages/shorebird_cli/lib/src/command_runner.dart
@@ -3,7 +3,7 @@ import 'package:args/command_runner.dart';
 import 'package:cli_completion/cli_completion.dart';
 import 'package:mason_logger/mason_logger.dart';
 import 'package:shorebird_cli/src/commands/commands.dart';
-import 'package:shorebird_cli/src/engine_revision.dart';
+import 'package:shorebird_cli/src/shorebird_environment.dart';
 import 'package:shorebird_cli/src/version.dart';
 
 const executableName = 'shorebird';
@@ -99,7 +99,7 @@ class ShorebirdCliCommandRunner extends CompletionCommandRunner<int> {
       _logger.info(
         '''
 Shorebird $packageVersion
-Shorebird Engine • revision $shorebirdEngineRevision''',
+Shorebird Engine • revision ${ShorebirdEnvironment.shorebirdEngineRevision}''',
       );
       exitCode = ExitCode.success.code;
     } else {
diff --git a/packages/shorebird_cli/lib/src/commands/doctor_command.dart b/packages/shorebird_cli/lib/src/commands/doctor_command.dart
index 6a7b997f..35485f78 100644
--- a/packages/shorebird_cli/lib/src/commands/doctor_command.dart
+++ b/packages/shorebird_cli/lib/src/commands/doctor_command.dart
@@ -1,6 +1,7 @@
 import 'package:collection/collection.dart';
 import 'package:mason_logger/mason_logger.dart';
 import 'package:shorebird_cli/src/command.dart';
+import 'package:shorebird_cli/src/shorebird_environment.dart';
 import 'package:shorebird_cli/src/shorebird_version_mixin.dart';
 import 'package:shorebird_cli/src/validators/validators.dart';
 import 'package:shorebird_cli/src/version.dart';
@@ -40,7 +41,7 @@ class DoctorCommand extends ShorebirdCommand with ShorebirdVersionMixin {
     logger.info('''
 
 Shorebird v$packageVersion
-''');
+Shorebird Engine • revision ${ShorebirdEnvironment.shorebirdEngineRevision}''');
 
     var numIssues = 0;
     for (final validator in validators) {
diff --git a/packages/shorebird_cli/lib/src/engine_revision.dart b/packages/shorebird_cli/lib/src/engine_revision.dart
deleted file mode 100644
index 11172173..00000000
--- a/packages/shorebird_cli/lib/src/engine_revision.dart
+++ /dev/null
@@ -1,2 +0,0 @@
-/// The hash of the Shorebird engine used by this version of Shorebird CLI.
-const shorebirdEngineRevision = '8b89f8bd9fc6982aa9c4557fd0e5e89db1ff9986';
diff --git a/packages/shorebird_cli/lib/src/shorebird_environment.dart b/packages/shorebird_cli/lib/src/shorebird_environment.dart
index f335b7a4..e5ef4803 100644
--- a/packages/shorebird_cli/lib/src/shorebird_environment.dart
+++ b/packages/shorebird_cli/lib/src/shorebird_environment.dart
@@ -17,6 +17,34 @@ abstract class ShorebirdEnvironment {
   static Directory get shorebirdRoot =>
       File(platform.script.toFilePath()).parent.parent.parent;
 
+  static String get shorebirdEngineRevision {
+    return _shorebirdEngineRevision ??
+        File(
+          p.join(flutterDirectory.path, 'bin', 'internal', 'engine.version'),
+        ).readAsStringSync();
+  }
+
+  static String? _shorebirdEngineRevision;
+
+  @visibleForTesting
+  static set shorebirdEngineRevision(String revision) {
+    _shorebirdEngineRevision = revision;
+  }
+
+  static String? _flutterRevision;
+
+  @visibleForTesting
+  static set flutterRevision(String revision) {
+    _flutterRevision = revision;
+  }
+
+  static String get flutterRevision {
+    return _flutterRevision ??
+        File(
+          p.join(shorebirdRoot.path, 'bin', 'internal', 'flutter.version'),
+        ).readAsStringSync();
+  }
+
   /// The root of the Shorebird-vended Flutter git checkout.
   static Directory get flutterDirectory => Directory(
         p.join(
diff --git a/packages/shorebird_cli/lib/src/shorebird_process.dart b/packages/shorebird_cli/lib/src/shorebird_process.dart
index 096fff1e..e231e09c 100644
--- a/packages/shorebird_cli/lib/src/shorebird_process.dart
+++ b/packages/shorebird_cli/lib/src/shorebird_process.dart
@@ -86,6 +86,8 @@ abstract class ShorebirdProcess {
     required String executable,
   }) {
     if (executable == 'flutter') {
+      // If this ever changes we also need to update the `shorebird` shell
+      // wrapper which downloads runs Flutter to fetch artifacts the first time.
       return {'FLUTTER_STORAGE_BASE_URL': 'https://download.shorebird.dev/'};
     }
 
diff --git a/packages/shorebird_cli/lib/src/validators/shorebird_flutter_validator.dart b/packages/shorebird_cli/lib/src/validators/shorebird_flutter_validator.dart
index 2c0e331d..ba8743c6 100644
--- a/packages/shorebird_cli/lib/src/validators/shorebird_flutter_validator.dart
+++ b/packages/shorebird_cli/lib/src/validators/shorebird_flutter_validator.dart
@@ -45,10 +45,9 @@ class ShorebirdFlutterValidator extends Validator {
       );
     }
 
-    if (!await _flutterDirectoryTracksStable()) {
+    if (!await _flutterDirectoryTracksCorrectRevision()) {
       final message =
-          '${ShorebirdEnvironment.flutterDirectory} is not on the "stable" '
-          'branch';
+          '''${ShorebirdEnvironment.flutterDirectory} is not on the correct revision''';
       issues.add(
         ValidationIssue(
           severity: ValidationIssueSeverity.warning,
@@ -102,13 +101,15 @@ This can cause unexpected behavior if you are switching between the tools and th
         .contains('nothing to commit, working tree clean');
   }
 
-  Future<bool> _flutterDirectoryTracksStable() async {
+  Future<bool> _flutterDirectoryTracksCorrectRevision() async {
     final result = await runProcess(
       'git',
-      ['--no-pager', 'branch'],
+      ['rev-parse', 'HEAD'],
       workingDirectory: ShorebirdEnvironment.flutterDirectory.path,
     );
-    return result.stdout.toString().contains('* stable');
+    return result.stdout
+        .toString()
+        .contains(ShorebirdEnvironment.flutterRevision);
   }
 
   Future<String> _shorebirdFlutterVersion() => _getFlutterVersion(
diff --git a/packages/shorebird_cli/test/src/cache_test.dart b/packages/shorebird_cli/test/src/cache_test.dart
index 3ad38215..6e672baf 100644
--- a/packages/shorebird_cli/test/src/cache_test.dart
+++ b/packages/shorebird_cli/test/src/cache_test.dart
@@ -6,7 +6,6 @@ import 'package:mocktail/mocktail.dart';
 import 'package:path/path.dart' as p;
 import 'package:platform/platform.dart';
 import 'package:shorebird_cli/src/cache.dart';
-import 'package:shorebird_cli/src/engine_revision.dart';
 import 'package:shorebird_cli/src/shorebird_environment.dart';
 import 'package:test/test.dart';
 
@@ -43,6 +42,7 @@ void main() {
 
       shorebirdRoot = Directory.systemTemp.createTempSync();
       ShorebirdEnvironment.platform = platform;
+      ShorebirdEnvironment.shorebirdEngineRevision = 'test-revision';
 
       when(() => platform.isMacOS).thenReturn(true);
       when(() => platform.isWindows).thenReturn(false);
@@ -121,7 +121,7 @@ void main() {
             request.url,
             equals(
               Uri.parse(
-                '${cache.storageBaseUrl}/${cache.storageBucket}/shorebird/$shorebirdEngineRevision/patch-darwin-x64.zip',
+                '${cache.storageBaseUrl}/${cache.storageBucket}/shorebird/${ShorebirdEnvironment.shorebirdEngineRevision}/patch-darwin-x64.zip',
               ),
             ),
           );
@@ -141,7 +141,7 @@ void main() {
             request.url,
             equals(
               Uri.parse(
-                '${cache.storageBaseUrl}/${cache.storageBucket}/shorebird/$shorebirdEngineRevision/patch-windows-x64.zip',
+                '${cache.storageBaseUrl}/${cache.storageBucket}/shorebird/${ShorebirdEnvironment.shorebirdEngineRevision}/patch-windows-x64.zip',
               ),
             ),
           );
@@ -161,7 +161,7 @@ void main() {
             request.url,
             equals(
               Uri.parse(
-                '${cache.storageBaseUrl}/${cache.storageBucket}/shorebird/$shorebirdEngineRevision/patch-linux-x64.zip',
+                '${cache.storageBaseUrl}/${cache.storageBucket}/shorebird/${ShorebirdEnvironment.shorebirdEngineRevision}/patch-linux-x64.zip',
               ),
             ),
           );
diff --git a/packages/shorebird_cli/test/src/command_runner_test.dart b/packages/shorebird_cli/test/src/command_runner_test.dart
index bff640cc..0e0c2b15 100644
--- a/packages/shorebird_cli/test/src/command_runner_test.dart
+++ b/packages/shorebird_cli/test/src/command_runner_test.dart
@@ -5,7 +5,7 @@ import 'package:cli_completion/cli_completion.dart';
 import 'package:mason_logger/mason_logger.dart';
 import 'package:mocktail/mocktail.dart';
 import 'package:shorebird_cli/src/command_runner.dart';
-import 'package:shorebird_cli/src/engine_revision.dart';
+import 'package:shorebird_cli/src/shorebird_environment.dart';
 import 'package:shorebird_cli/src/version.dart';
 import 'package:test/test.dart';
 
@@ -22,6 +22,7 @@ void main() {
     setUp(() {
       logger = _MockLogger();
 
+      ShorebirdEnvironment.shorebirdEngineRevision = 'test-revision';
       processResult = _MockProcessResult();
       when(() => processResult.exitCode).thenReturn(ExitCode.success.code);
       commandRunner = ShorebirdCliCommandRunner(logger: logger);
@@ -72,7 +73,7 @@ void main() {
           () => logger.info(
             '''
 Shorebird $packageVersion
-Shorebird Engine • revision $shorebirdEngineRevision''',
+Shorebird Engine • revision ${ShorebirdEnvironment.shorebirdEngineRevision}''',
           ),
         ).called(1);
       });
diff --git a/packages/shorebird_cli/test/src/commands/doctor_command_test.dart b/packages/shorebird_cli/test/src/commands/doctor_command_test.dart
index a736687f..f30fe419 100644
--- a/packages/shorebird_cli/test/src/commands/doctor_command_test.dart
+++ b/packages/shorebird_cli/test/src/commands/doctor_command_test.dart
@@ -1,6 +1,7 @@
 import 'package:mason_logger/mason_logger.dart';
 import 'package:mocktail/mocktail.dart';
 import 'package:shorebird_cli/src/commands/commands.dart';
+import 'package:shorebird_cli/src/shorebird_environment.dart';
 import 'package:shorebird_cli/src/validators/validators.dart';
 import 'package:test/test.dart';
 
@@ -30,6 +31,8 @@ void main() {
       logger = _MockLogger();
       progress = _MockProgress();
 
+      ShorebirdEnvironment.shorebirdEngineRevision = 'test-revision';
+
       when(() => logger.progress(any())).thenReturn(progress);
       when(() => logger.info(any())).thenReturn(null);
 
diff --git a/packages/shorebird_cli/test/src/shorebird_environment_test.dart b/packages/shorebird_cli/test/src/shorebird_environment_test.dart
new file mode 100644
index 00000000..4b84b06b
--- /dev/null
+++ b/packages/shorebird_cli/test/src/shorebird_environment_test.dart
@@ -0,0 +1,58 @@
+import 'dart:io';
+
+import 'package:mocktail/mocktail.dart';
+import 'package:path/path.dart' as p;
+import 'package:platform/platform.dart';
+import 'package:shorebird_cli/src/shorebird_environment.dart';
+import 'package:test/test.dart';
+
+class _MockPlatform extends Mock implements Platform {}
+
+void main() {
+  group('ShorebirdEnvironment', () {
+    late Platform platform;
+    late Directory shorebirdRoot;
+    late Uri platformScript;
+
+    setUp(() {
+      shorebirdRoot = Directory.systemTemp.createTempSync();
+      platformScript = Uri.file(
+        p.join(shorebirdRoot.path, 'bin', 'cache', 'shorebird.snapshot'),
+      );
+      platform = _MockPlatform();
+      ShorebirdEnvironment.platform = platform;
+
+      when(() => platform.script).thenReturn(platformScript);
+    });
+
+    group('flutterRevision', () {
+      test('returns correct revision', () {
+        const revision = 'test-revision';
+        File(p.join(shorebirdRoot.path, 'bin', 'internal', 'flutter.version'))
+          ..createSync(recursive: true)
+          ..writeAsStringSync(revision, flush: true);
+        expect(ShorebirdEnvironment.flutterRevision, equals(revision));
+      });
+    });
+
+    group('shorebirdEngineRevision', () {
+      test('returns correct revision', () {
+        const revision = 'test-revision';
+        File(
+          p.join(
+            shorebirdRoot.path,
+            'bin',
+            'cache',
+            'flutter',
+            'bin',
+            'internal',
+            'engine.version',
+          ),
+        )
+          ..createSync(recursive: true)
+          ..writeAsStringSync(revision, flush: true);
+        expect(ShorebirdEnvironment.shorebirdEngineRevision, equals(revision));
+      });
+    });
+  });
+}
diff --git a/packages/shorebird_cli/test/src/validators/shorebird_flutter_validator_test.dart b/packages/shorebird_cli/test/src/validators/shorebird_flutter_validator_test.dart
index bb66e660..07023796 100644
--- a/packages/shorebird_cli/test/src/validators/shorebird_flutter_validator_test.dart
+++ b/packages/shorebird_cli/test/src/validators/shorebird_flutter_validator_test.dart
@@ -14,16 +14,14 @@ class _MockPlatform extends Mock implements Platform {}
 
 void main() {
   group('ShorebirdFlutterValidator', () {
-    const gitStatusMessage = """
-On branch stable
-Your branch is up to date with 'origin/stable'.
-
+    const flutterRevision = '45fc514f1a9c347a3af76b02baf980a4d88b7879';
+    const gitStatusMessage = '''
+HEAD detached at 45fc514f
 nothing to commit, working tree clean
-""";
+''';
 
-    const gitBranchMessage = '''
-  main
-* stable
+    const gitRevParseHeadMessage = '''
+$flutterRevision
 ''';
 
     const pathFlutterVersionMessage = '''
@@ -44,7 +42,7 @@ Tools • Dart 2.19.6 • DevTools 2.20.1
     late Directory tempDir;
     late ProcessResult pathFlutterVersionProcessResult;
     late ProcessResult shorebirdFlutterVersionProcessResult;
-    late ProcessResult gitBranchProcessResult;
+    late ProcessResult gitRevParseHeadProcessResult;
     late ProcessResult gitStatusProcessResult;
 
     Directory flutterDirectory(Directory root) =>
@@ -64,13 +62,14 @@ Tools • Dart 2.19.6 • DevTools 2.20.1
       tempDir = setupTempDirectory();
 
       ShorebirdEnvironment.platform = _MockPlatform();
+      ShorebirdEnvironment.flutterRevision = flutterRevision;
       when(() => ShorebirdEnvironment.platform.script)
           .thenReturn(shorebirdScriptFile(tempDir).uri);
       when(() => ShorebirdEnvironment.platform.environment).thenReturn({});
 
       pathFlutterVersionProcessResult = _MockProcessResult();
       shorebirdFlutterVersionProcessResult = _MockProcessResult();
-      gitBranchProcessResult = _MockProcessResult();
+      gitRevParseHeadProcessResult = _MockProcessResult();
       gitStatusProcessResult = _MockProcessResult();
 
       validator = ShorebirdFlutterValidator(
@@ -85,8 +84,8 @@ Tools • Dart 2.19.6 • DevTools 2.20.1
           if (executable == 'git') {
             if (arguments.equals(['status'])) {
               return gitStatusProcessResult;
-            } else if (arguments.equals(['--no-pager', 'branch'])) {
-              return gitBranchProcessResult;
+            } else if (arguments.equals(['rev-parse', 'HEAD'])) {
+              return gitRevParseHeadProcessResult;
             }
           } else if (executable == 'flutter') {
             if (arguments.equals(['--version'])) {
@@ -109,7 +108,8 @@ Tools • Dart 2.19.6 • DevTools 2.20.1
           .thenReturn(shorebirdFlutterVersionMessage);
       when(() => shorebirdFlutterVersionProcessResult.stderr).thenReturn('');
       when(() => shorebirdFlutterVersionProcessResult.exitCode).thenReturn(0);
-      when(() => gitBranchProcessResult.stdout).thenReturn(gitBranchMessage);
+      when(() => gitRevParseHeadProcessResult.stdout)
+          .thenReturn(gitRevParseHeadMessage);
       when(() => gitStatusProcessResult.stdout).thenReturn(gitStatusMessage);
     });
 
@@ -141,16 +141,15 @@ Tools • Dart 2.19.6 • DevTools 2.20.1
     });
 
     test('warns when Flutter does not track stable', () async {
-      when(() => gitBranchProcessResult.stdout).thenReturn('''
-* main
-  stable
+      when(() => gitRevParseHeadProcessResult.stdout).thenReturn('''
+62bd79521d
 ''');
 
       final results = await validator.validate();
 
       expect(results, hasLength(1));
       expect(results.first.severity, ValidationIssueSeverity.warning);
-      expect(results.first.message, contains('is not on the "stable" branch'));
+      expect(results.first.message, contains('is not on the correct revision'));
     });
 
     test(
diff --git a/third_party/flutter/bin/internal/shared.sh b/third_party/flutter/bin/internal/shared.sh
index dfa11fb4..a9408229 100755
--- a/third_party/flutter/bin/internal/shared.sh
+++ b/third_party/flutter/bin/internal/shared.sh
@@ -11,10 +11,14 @@ unset CDPATH
 # Either clones or pulls the Shorebird Flutter repository, depending on whether FLUTTER_PATH exists.
 function update_flutter {
   if [[ -d "$FLUTTER_PATH" ]]; then
-    git --git-dir="$FLUTTER_PATH/.git" --work-tree="$FLUTTER_PATH" pull
+    git -C "$FLUTTER_PATH" fetch
   else
-    git clone --filter=tree:0 https://github.com/shorebirdtech/flutter.git -b stable "$FLUTTER_PATH"
+    git clone --filter=tree:0 https://github.com/shorebirdtech/flutter.git --no-checkout "$FLUTTER_PATH"
   fi
+  # -c to avoid printing a warning about being in a detached head state.
+  git -C "$FLUTTER_PATH" -c advice.detachedHead=false checkout "$FLUTTER_VERSION"
+  SHOREBIRD_ENGINE_VERSION=`cat "$FLUTTER_PATH/bin/internal/engine.version"`
+  echo "Shorebird Engine • revision $SHOREBIRD_ENGINE_VERSION"
   # Install Shorebird Flutter Artifacts
   FLUTTER_STORAGE_BASE_URL=https://download.shorebird.dev/ $FLUTTER_PATH/bin/flutter --version  
 }
@@ -23,7 +27,7 @@ function pub_upgrade_with_retry {
   local total_tries="10"
   local remaining_tries=$((total_tries - 1))
   while [[ "$remaining_tries" -gt 0 ]]; do
-    (cd "$SHOREBIRD_CLI_DIR" && dart pub upgrade) && break
+    (cd "$SHOREBIRD_CLI_DIR" && $DART_PATH pub upgrade) && break
     >&2 echo "Error: Unable to 'pub upgrade' shorebird. Retrying in five seconds... ($remaining_tries tries left)"
     remaining_tries=$((remaining_tries - 1))
     sleep 5
@@ -161,7 +165,7 @@ function upgrade_shorebird () (
     fi
 
     # Compile...
-    dart --verbosity=error --disable-dart-dev --snapshot="$SNAPSHOT_PATH" --snapshot-kind="app-jit" --packages="$SHOREBIRD_CLI_DIR/.dart_tool/package_config.json" --no-enable-mirrors "$SCRIPT_PATH" > /dev/null
+    $DART_PATH --verbosity=error --disable-dart-dev --snapshot="$SNAPSHOT_PATH" --snapshot-kind="app-jit" --packages="$SHOREBIRD_CLI_DIR/.dart_tool/package_config.json" --no-enable-mirrors "$SCRIPT_PATH" > /dev/null
     echo "$compilekey" > "$STAMP_PATH"
 
     # Delete any temporary snapshot path.
@@ -185,6 +189,7 @@ function shared::execute() {
   STAMP_PATH="$SHOREBIRD_ROOT/bin/cache/shorebird.stamp"
   SCRIPT_PATH="$SHOREBIRD_CLI_DIR/bin/shorebird.dart"
   FLUTTER_PATH="$SHOREBIRD_ROOT/bin/cache/flutter"
+  export DART_PATH="$FLUTTER_PATH/bin/cache/dart-sdk/bin/dart"
 
   # Test if running as superuser – but don't warn if running within Docker or CI.
   if [[ "$EUID" == "0" && ! -f /.dockerenv && "$CI" != "true" && "$BOT" != "true" && "$CONTINUOUS_INTEGRATION" != "true" ]]; then
@@ -200,18 +205,6 @@ function shared::execute() {
     exit 1
   fi
 
-  # Test if Dart is available on the Host
-  if ! hash dart 2>/dev/null; then
-    >&2 echo "Error: Unable to find dart in your PATH."
-    exit 1
-  fi
-
-  # Test if Flutter is available on the Host
-  if ! hash flutter 2>/dev/null; then
-    >&2 echo "Error: Unable to find flutter in your PATH."
-    exit 1
-  fi
-
   # Test if the shorebird directory is a git clone (otherwise git rev-parse HEAD
   # would fail)
   if [[ ! -e "$SHOREBIRD_ROOT/.git" ]]; then
@@ -227,7 +220,7 @@ function shared::execute() {
   BIN_NAME="$(basename "$PROG_NAME")"
   case "$BIN_NAME" in    
     shorebird*)
-      exec "dart" "$SNAPSHOT_PATH" "$@"
+      exec "$DART_PATH" "$SNAPSHOT_PATH" "$@"
       ;;
     *)
       >&2 echo "Error! Executable name $BIN_NAME not recognized!"