diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0930434..7ced65a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,6 +25,8 @@ jobs:
           - "3.1"
           - "3.2"
           - "3.3"
+          - "3.4"
+          - "4.0"
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
diff --git a/test/scientist/experiment_test.rb b/test/scientist/experiment_test.rb
index 434e673..9dbb330 100644
--- a/test/scientist/experiment_test.rb
+++ b/test/scientist/experiment_test.rb
@@ -604,7 +604,7 @@ def @ex.raised(op, exception)
         assert_equal "  \"value\"", lines[2]
         assert_equal "candidate:", lines[3]
         assert_equal "  #<RuntimeError: error>", lines[4]
-        assert_match %r(test/scientist/experiment_test.rb:\d+:in `block), lines[5]
+        assert_match %r(test/scientist/experiment_test.rb:\d+:in [`']block), lines[5]
       end
     end
   end