diff --git a/.github/workflows/non_mri.yml b/.github/workflows/non_mri.yml
index 1c991923..c67378e6 100644
--- a/.github/workflows/non_mri.yml
+++ b/.github/workflows/non_mri.yml
@@ -21,11 +21,12 @@ jobs:
           - { os: ubuntu-20.04 , ruby: jruby }
           - { os: ubuntu-20.04 , ruby: jruby, no-ssl: ' no SSL' }
           - { os: ubuntu-20.04 , ruby: jruby-head, allow-failure: true }
-          - { os: ubuntu-20.04 , ruby: truffleruby-head }
+          - { os: ubuntu-20.04 , ruby: truffleruby }
+          - { os: ubuntu-20.04 , ruby: truffleruby-head, allow-failure: true }
           - { os: macos-10.15  , ruby: jruby }
-          - { os: macos-10.15  , ruby: truffleruby-head }
+          - { os: macos-10.15  , ruby: truffleruby }
           - { os: macos-11     , ruby: jruby }
-          - { os: macos-11     , ruby: truffleruby-head }
+          - { os: macos-11     , ruby: truffleruby }
 
     steps:
       - name: repo checkout