diff --git a/Rakefile b/Rakefile
index 0d77149..cccf142 100644
--- a/Rakefile
+++ b/Rakefile
@@ -18,6 +18,7 @@ task default: "test:all"
 namespace :test do
   mappers = %w(
     active_record_edge
+    active_record_51
     active_record_50
     active_record_42
     active_record_41