diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index fd15653..beb315c 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [2.6, 2.7]
+        ruby: [2.6, 2.7, truffleruby-head]
         rails: [5.2.4.4, 6.0.3.4]
     env:
       RAILS_VERSION: ${{ matrix.rails }}