diff --git a/pubspec.yaml b/pubspec.yaml
index 3a931fbd..dc12e555 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -11,3 +11,4 @@ dependencies:
   args: ^1.0.0
   io: ^0.3.2
   logging: ^0.11.3
+  pub_sub: ^2.0.0