diff --git a/test/irb/helper.rb b/test/irb/helper.rb
index 17e463e2a..6a0183104 100644
--- a/test/irb/helper.rb
+++ b/test/irb/helper.rb
@@ -114,7 +114,7 @@ def execute_lines(*lines, conf: {}, main: self, irb_path: nil)
 
   class IntegrationTestCase < TestCase
     LIB = File.expand_path("../../lib", __dir__)
-    TIMEOUT_SEC = 3
+    TIMEOUT_SEC = ENV["CI"] ? 30 : 3
 
     def setup
       @envs = {}