diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1edb433..269ac0c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,9 +15,10 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.0'
+          - '1.6'
           - '1.7'
           - '1.8'
+          - '1.9'
           - '1' # automatically expands to the latest stable 1.x release of Julia
           - 'nightly'
         os: