diff --git a/setup.py b/setup.py
index 89f37dc..34d11b5 100755
--- a/setup.py
+++ b/setup.py
@@ -41,6 +41,7 @@ deps = [
     'urlcanon>=0.1.dev16',
     'doublethink>=0.2.0.dev81',
     'PySocks',
+    'cryptography!=2.1.1', # 2.1.1 installation is failing on ubuntu
 ]
 try:
     import concurrent.futures
@@ -49,7 +50,7 @@ except:
 
 setuptools.setup(
         name='warcprox',
-        version='2.2b1.dev105',
+        version='2.2b1.dev106',
         description='WARC writing MITM HTTP/S proxy',
         url='https://github.com/internetarchive/warcprox',
         author='Noah Levitt',