diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index d0a3b706..2b40114e 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -44,7 +44,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.8'
+          - '1.9'
         os:
           - ubuntu-latest
           - macOS-latest