diff --git a/pubspec.yaml b/pubspec.yaml
index 35b6517..90f96f5 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -9,7 +9,6 @@
   sdk: '>=1.9.0 <2.0.0'
 dependencies:
   async: '^1.10.0'
-  collection: '^1.0.0'
   path: '>=0.9.0 <2.0.0'
 dev_dependencies:
   benchmark_harness: '^1.0.4'