diff --git a/test/objspace/test_ractor.rb b/test/objspace/test_ractor.rb
index 0fe4c32f2f0741..fb6432a8272595 100644
--- a/test/objspace/test_ractor.rb
+++ b/test/objspace/test_ractor.rb
@@ -14,7 +14,7 @@ def test_tracing_does_not_crash
   end
 
   def test_undefine_finalizer
-    assert_ractor(<<~'RUBY', require: 'objspace', signal: :SEGV)
+    assert_ractor(<<~'RUBY', timeout: 20, require: 'objspace', signal: :SEGV)
       def fin
         ->(id) { }
       end
diff --git a/test/ruby/test_ractor.rb b/test/ruby/test_ractor.rb
index 36467a35918981..eaf861946ef8f1 100644
--- a/test/ruby/test_ractor.rb
+++ b/test/ruby/test_ractor.rb
@@ -100,7 +100,7 @@ def initialize(*)
   end
 
   def test_move_nested_hash_during_gc_with_yjit
-    assert_ractor(<<~'RUBY', args: [{ "RUBY_YJIT_ENABLE" => "1" }])
+    assert_ractor(<<~'RUBY', timeout: 20, args: [{ "RUBY_YJIT_ENABLE" => "1" }])
       GC.stress = true
       hash = { foo: { bar: "hello" }, baz: { qux: "there" } }
       result = Ractor.new { Ractor.receive }.send(hash, move: true).value