diff --git a/packages/shorebird_cli/test/src/commands/publish_command_test.dart b/packages/shorebird_cli/test/src/commands/publish_command_test.dart
index 24262f2a..c3647d28 100644
--- a/packages/shorebird_cli/test/src/commands/publish_command_test.dart
+++ b/packages/shorebird_cli/test/src/commands/publish_command_test.dart
@@ -39,6 +39,7 @@ void main() {
       arch: 'aarch64',
       platform: 'android',
       hash: '#',
+      size: 42,
       url: 'https://example.com',
     );
     const release = Release(
diff --git a/packages/shorebird_code_push_client/lib/src/code_push_client.dart b/packages/shorebird_code_push_client/lib/src/code_push_client.dart
index d703bb17..7a47bca0 100644
--- a/packages/shorebird_code_push_client/lib/src/code_push_client.dart
+++ b/packages/shorebird_code_push_client/lib/src/code_push_client.dart
@@ -65,6 +65,7 @@ class CodePushClient {
       'arch': arch,
       'platform': platform,
       'hash': hash,
+      'size': '${file.length}',
     });
     request.headers.addAll(_apiKeyHeader);
     final response = await _httpClient.send(request);
diff --git a/packages/shorebird_code_push_client/test/src/code_push_client_test.dart b/packages/shorebird_code_push_client/test/src/code_push_client_test.dart
index 2af766ad..ff8fee81 100644
--- a/packages/shorebird_code_push_client/test/src/code_push_client_test.dart
+++ b/packages/shorebird_code_push_client/test/src/code_push_client_test.dart
@@ -61,6 +61,7 @@ void main() {
       const arch = 'aarch64';
       const platform = 'android';
       const hash = 'test-hash';
+      const size = 42;
 
       test('throws an exception if the http request fails (unknown)', () async {
         when(() => httpClient.send(any())).thenAnswer((_) async {
@@ -137,6 +138,7 @@ void main() {
                     arch: arch,
                     platform: platform,
                     hash: hash,
+                    size: size,
                   ),
                 ),
               ),