diff --git a/setup.py b/setup.py
index 89b53b7..516a62a 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@ from setuptools import Command, find_packages, setup
 
 requirements = [
     # https://github.com/mitsuhiko/click/issues/200
-    'click>=5.0',
+    'click>=5.0,<6.0',
     'click-log>=0.3.0, <0.4.0',
 
     # https://github.com/pimutils/vdirsyncer/issues/478
diff --git a/test-requirements.txt b/test-requirements.txt
index 010a782..d05994c 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
-hypothesis>=3.1
+hypothesis>=3.1,<4.0
 pytest
 pytest-localserver
 pytest-subtesthack