diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..408069a
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+ruby-3.4.1
diff --git a/tests/tc_curl_multi.rb b/tests/tc_curl_multi.rb
index 2c68b55..74ddf62 100644
--- a/tests/tc_curl_multi.rb
+++ b/tests/tc_curl_multi.rb
@@ -186,7 +186,7 @@ def test_multi_easy_get_with_error
     rescue Curl::Err::AbortedByCallbackError => e
       did_raise = true
       in_file = e.backtrace.detect {|err| err.match?(File.basename(__FILE__)) }
-      in_file_stack = e.backtrace.select {|err| err.match?(File.basename(__FILE__)) }
+      #in_file_stack = e.backtrace.select {|err| err.match?(File.basename(__FILE__)) }
       assert_match(__FILE__, in_file)
       in_file.gsub!(__FILE__)
       parts = in_file.split(':')