diff --git a/setup.py b/setup.py
index dad03781..888872cc 100755
--- a/setup.py
+++ b/setup.py
@@ -44,7 +44,7 @@ requires = [
     'certifi>=2017.4.17'
 
 ]
-test_requirements = ['pytest>=2.8.0', 'pytest-httpbin==0.0.7', 'pytest-cov', 'pytest-mock']
+test_requirements = ['pytest>=2.8.0', 'pytest-httpbin==0.0.7', 'pytest-cov', 'pytest-mock', 'PySocks>=1.5.6, !=1.5.7']
 
 about = {}
 with open(os.path.join(here, 'requests', '__version__.py'), 'r', 'utf-8') as f: