diff --git a/pubspec.yaml b/pubspec.yaml
index 3175465..dd0c25d 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -6,7 +6,7 @@
 homepage: https://github.com/xxgreg/mustache
 
 environment:
-  sdk: '>=1.0.0 <2.0.0'
+  sdk: '>=1.8.0 <2.0.0'
 
 dependencies:
   reflectable: '^0.5.0'