diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 0852c1e..d05efbe 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -24,7 +24,7 @@ jobs:
       matrix:
         version:
           - '1.10'
-          - '1.6'
+          - '1.9'
           - 'nightly'
         os:
           - ubuntu-latest