diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index e192da2..984d8ce 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -33,6 +33,7 @@ jobs:
           - 110.99.3
           - 110.99.4
           - 110.99.5
+          - 110.99.6
         include:
           # SML/NJ 110.87 and 110.97
           - os: ubuntu-20.04