diff --git a/setup.py b/setup.py
index 6b21450..1f69b4f 100755
--- a/setup.py
+++ b/setup.py
@@ -102,7 +102,7 @@ setup(
         'nose',
         'scripttest',
         'mock',
-        'hypothesis!=3.56.9',
+        'hypothesis!=3.56.9,<4',
         'flake8'
     ],
     entry_points={
diff --git a/tox.ini b/tox.ini
index 142ca43..0654f3a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ deps = nose
        pytest!=3.2.0,!=3.3.0
        pytest-cov
        pytest-mock
-       hypothesis!=3.56.9
+       hypothesis!=3.56.9,<4
        viivakoodi
 commands = py.test --cov escpos
 passenv = ESCPOS_CAPABILITIES_PICKLE_DIR ESCPOS_CAPABILITIES_FILE CI TRAVIS TRAVIS_* APPVEYOR APPVEYOR_* CODECOV_*