diff --git a/add_to_app/books/flutter_module_books/pubspec.yaml b/add_to_app/books/flutter_module_books/pubspec.yaml
index 9c971d55d..637cd573b 100644
--- a/add_to_app/books/flutter_module_books/pubspec.yaml
+++ b/add_to_app/books/flutter_module_books/pubspec.yaml
@@ -15,7 +15,7 @@ dependencies:
 dev_dependencies:
   analysis_defaults:
     path: ../../../analysis_defaults
-  pigeon: ">=11.0.0 <19.0.0"
+  pigeon: ">=11.0.0 <20.0.0"
   flutter_test:
     sdk: flutter