diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ee86b6f..3f2d859 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,14 +17,17 @@ jobs:
       fail-fast: false
       matrix:
         # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
-        ruby: [2.7, '3.0', 3.1, 3.2, 3.3, truffleruby]
+        ruby: [2.7, '3.0', 3.1, 3.2, 3.3]
         sinatra:
           - ~> 4.0.0 # current stable
         include:
           - { ruby: 2.6, sinatra: ~> 3.0.0 }
           - { ruby: 3.3, sinatra: head }
           - { ruby: head, sinatra: head }
+          # https://github.com/sinatra/mustermann/issues/72
           - { ruby: jruby, sinatra: ~> 4.0.0, allow-failure: true }
+          # https://github.com/sinatra/mustermann/issues/143
+          - { ruby: truffleruby, sinatra: ~> 4.0.0, allow-failure: true }
     env:
       sinatra: ${{ matrix.sinatra }}
     steps: