diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 32edb6a..80f279b 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -17,6 +17,7 @@ jobs:
           julia-version:
             - "1.7"
             - "1.9"
+            - "1"
           os:
             - ubuntu-latest
             - macos-latest