diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 47397ebe..4b8b1181 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -10,6 +10,7 @@ jobs:
       matrix:
         version:
           - '1'
+          - '1.3' # minimum supported version
         os:
           - ubuntu-latest
           - macOS-latest