diff --git a/test/apis/github_test.dart b/test/apis/github_test.dart
index a0231248..300c68ab 100644
--- a/test/apis/github_test.dart
+++ b/test/apis/github_test.dart
@@ -1,3 +1,5 @@
+// @dart=2.9
+
 import 'dart:convert';
 import 'dart:io';
 
diff --git a/test/apis/gitlab_test.dart b/test/apis/gitlab_test.dart
index 2e726895..c293f59d 100644
--- a/test/apis/gitlab_test.dart
+++ b/test/apis/gitlab_test.dart
@@ -1,3 +1,5 @@
+// @dart=2.9
+
 import 'dart:convert';
 import 'dart:io';