diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 9e38237..1cf87bc 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.8'
+          - '1.9'
           - '1.10'
         os:
           - ubuntu-latest