diff --git a/setup.py b/setup.py
index c5c2492..8f5c8c7 100644
--- a/setup.py
+++ b/setup.py
@@ -18,9 +18,9 @@ LONG_DESC = open('README.rst', encoding='utf-8').read()
 
 extras_require = {
     'test': [
-        'pytest ~= 3.5',
-        'hypothesis ~= 3.56',
-        'pretend ~= 1.0',
+        'pytest >= 3.5',
+        'hypothesis >= 3.56',
+        'pretend >= 1.0',
     ],
     'docstest': [
         'doc8',
@@ -49,9 +49,9 @@ setup(
     packages=find_packages('src'),
     package_dir={'': 'src'},
     install_requires=[
-        'arpeggio ~= 1.7',
+        'arpeggio >= 1.7',
         'attrs >= 17.4.0',
-        'six ~= 1.9',
+        'six >= 1.9',
     ],
     extras_require=extras_require,
     python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',