diff --git a/pubspec.yaml b/pubspec.yaml
index 75fbf00..eb894e1 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -18,7 +18,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+68
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: "<4.0.0"
 
 # Dependencies specify other packages that your package needs in order to work.
 # To automatically upgrade your package dependencies to the latest versions