diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index f74b5a0..62e58f8 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -17,4 +17,4 @@ jobs:
         bundler-cache: true
 
     - name: Outdated readme check
-      run: bundle exec readme:outdated
+      run: bundle exec rake readme:outdated
diff --git a/test/test_atlasq.rb b/test/test_atlasq.rb
index d5755ae..5dc0603 100644
--- a/test/test_atlasq.rb
+++ b/test/test_atlasq.rb
@@ -16,7 +16,7 @@ def executable_path
   # @param expected_stderr [String]
   # @param expected_status [Integer]
   def assert_command(args:, expected_stdout: "", expected_stderr: "", expected_status: 0)
-    stdout, stderr, status = Open3.capture3(executable_path, *args)
+    stdout, stderr, status = Open3.capture3({ "RUBYOPT" => "-W0" }, executable_path, *args)
 
     assert_equal expected_stdout, stdout
     assert_equal expected_stderr, stderr
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 8211a0d..a5033c6 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+# Avoid accidental debug output causing test failures.
 ENV.delete("ATLASQ_DEBUG")
 
 $LOAD_PATH.unshift File.expand_path("../lib", __dir__)