diff --git a/setup.py b/setup.py
index 04baa9eb..44cec5bd 100755
--- a/setup.py
+++ b/setup.py
@@ -78,8 +78,8 @@ setup(name='fdroidserver',
           'paramiko',
           'Pillow',
           'apache-libcloud >= 0.14.1',
-          'pyasn1 <0.5.0, >=0.4.1',
-          'pyasn1-modules == 0.2.1',
+          'pyasn1 >=0.4.1, < 0.5.0',
+          'pyasn1-modules >= 0.2.1, < 0.3',
           'python-vagrant',
           'PyYAML',
           'qrcode',