diff --git a/setup.py b/setup.py
index 0d92127..f76e8d2 100755
--- a/setup.py
+++ b/setup.py
@@ -132,7 +132,7 @@ setup(
         'nose',
         'scripttest',
         'mock',
-        'hypothesis',
+        'hypothesis<=3.28.3',
         'flake8'
     ],
     cmdclass={'test': Tox},
diff --git a/test/test_printer_file.py b/test/test_printer_file.py
index 48b7606..b69617b 100644
--- a/test/test_printer_file.py
+++ b/test/test_printer_file.py
@@ -16,7 +16,7 @@ from __future__ import unicode_literals
 import six
 
 import pytest
-from hypothesis import given
+from hypothesis import given, settings
 from hypothesis.strategies import text
 
 import escpos.printer as printer
@@ -37,6 +37,7 @@ def test_load_file_printer(mocker, path):
     mock_open.assert_called_with(path, "wb")
 
 
+@settings(deadline=None)
 @given(txt=text())
 def test_auto_flush(mocker, txt):
     """test auto_flush in file-printer"""
@@ -57,6 +58,7 @@ def test_auto_flush(mocker, txt):
     assert mock_device.flush.called
 
 
+@settings(deadline=None)
 @given(txt=text())
 def test_flush_on_close(mocker, txt):
     """test flush on close in file-printer"""
diff --git a/tox.ini b/tox.ini
index a61a4a8..174cd85 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ deps = nose
        pytest!=3.2.0
        pytest-cov
        pytest-mock
-       hypothesis
+       hypothesis<=3.28.3
        viivakoodi
 commands = py.test --cov escpos