diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 2308472..58d1767 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -23,7 +23,8 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.10'
+          - '1.6'
+          - '1'
         os:
           - ubuntu-latest
           - macOS-latest