Fix pub dependency versions
diff --git a/pubspec.yaml b/pubspec.yaml
index a52743b..8c4f922 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -15,7 +15,7 @@
   dart_style: ^1.3.6
   matcher: ^0.12.3
   meta: '>=1.0.4 <1.2.0'
-  source_gen: ^0.9.7
+  source_gen: ^0.9.6
   test_api: ^0.2.1
 
 dev_dependencies: