diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 678e1cd..1d2ac58 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -18,6 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
+          - '1'
           - '1.6'
           - 'nightly'
         os: