diff --git a/pkgs/watcher/pubspec.yaml b/pkgs/watcher/pubspec.yaml
index a0e0ce4..adf8ddb 100644
--- a/pkgs/watcher/pubspec.yaml
+++ b/pkgs/watcher/pubspec.yaml
@@ -12,4 +12,4 @@
   scheduled_test: ">=0.9.3-dev <0.11.0"
   unittest: ">=0.9.2 <0.10.0"
 environment:
-  sdk: ">=1.3.0 <2.0.0"
+  sdk: ">=1.6.0 <2.0.0"