diff --git a/test/plugin/test_in_tail.rb b/test/plugin/test_in_tail.rb
index a5c389aafb..e5e1c15bd9 100644
--- a/test/plugin/test_in_tail.rb
+++ b/test/plugin/test_in_tail.rb
@@ -498,7 +498,7 @@ def test_emit_with_read_lines_limit(data)
       d = create_driver(config)
       msg = 'x' * 65000 # in_tail reads 65536 bytes at once.
 
-      d.run(expect_emits: num_events, timeout: 2) do
+      d.run(expect_emits: num_events, timeout: 10) do
         Fluent::FileWrapper.open("#{@tmp_dir}/tail.txt", "ab") {|f|
           f.puts msg
           f.puts msg
@@ -792,7 +792,7 @@ def test_watch_wildcard_path_without_watch_timer
 
       d = create_driver(config, false)
 
-      d.run(expect_emits: 1, timeout: 1) do
+      d.run(expect_emits: 1, timeout: 10) do
         Fluent::FileWrapper.open("#{@tmp_dir}/tail.txt", "ab") {|f|
           f.puts "test3"
           f.puts "test4"
@@ -834,7 +834,7 @@ def test_emit_with_disable_stat_watcher(data)
     def test_always_read_from_head_on_detecting_a_new_file
       d = create_driver(SINGLE_LINE_CONFIG)
 
-      d.run(expect_emits: 1, timeout: 3) do
+      d.run(expect_emits: 1, timeout: 10) do
         Fluent::FileWrapper.open("#{@tmp_dir}/tail.txt", "wb") {|f|
           f.puts "test1\ntest2\n"
         }