diff --git a/pubspec.yaml b/pubspec.yaml
index 740e0fe..0e46be9 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -10,7 +10,7 @@ environment:
 
 dependencies:
   build: ^2.3.0
-  source_gen: ^1.2.2
+  source_gen: ^4.0.0
   analyzer: ^4.1.0
   mustache: ^1.1.1
   glob: ^2.0.0