diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index dea25b7..c57a8c4 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -20,8 +20,7 @@ jobs:
       matrix:
         version:
           - '1.6'
-          - '1.9'
-          - 'nightly'
+          - '1'
         os:
           - ubuntu-latest
         arch: