diff --git a/.github/workflows/cron.yml b/.github/workflows/cron.yml
index da6f575..61e9768 100644
--- a/.github/workflows/cron.yml
+++ b/.github/workflows/cron.yml
@@ -16,8 +16,8 @@ jobs:
       matrix:
         channel:
           - unstable
+          - 21.05
           - 20.09
-          - 20.03
 
     env:
       AWS_DEFAULT_REGION: us-east-1