diff --git a/pubspec.yaml b/pubspec.yaml
index a50c402..61b73c0 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 0.4.1
 homepage: https://github.com/andrey-ushakov/esc_pos_bluetooth
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.18.4 <3.0.0"
 
 dependencies:
   flutter: