diff --git a/flutter_secure_storage/pubspec.yaml b/flutter_secure_storage/pubspec.yaml
index dc3f3d62..04f2dbb0 100644
--- a/flutter_secure_storage/pubspec.yaml
+++ b/flutter_secure_storage/pubspec.yaml
@@ -4,7 +4,7 @@ version: 9.2.1
 repository: https://github.com/mogol/flutter_secure_storage/tree/develop/flutter_secure_storage
 
 environment:
-  sdk: ">=2.12.0 <4.0.0"
+  sdk: ">=2.15.0 <4.0.0"
   flutter: ">=2.0.0"
 
 flutter: