diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 83f9fe4..739c712 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -11,7 +11,7 @@ jobs:
       matrix:
         version:
           # - '1.6'
-          - '1.8'
+          - '1.9'
         os:
           - ubuntu-latest
         arch: