diff --git a/pubspec.yaml b/pubspec.yaml
index 6600b06..9848e2b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -8,7 +8,7 @@ environment:
 
 dependencies:
   args: ^2.5.0
-  collection: ^1.19.0
+  collection: ^1.18.0
   console: ^4.1.0
   html_unescape: ^2.0.0
   http: ^1.2.2