Require pyasn1 0.1.3
diff --git a/setup.py b/setup.py
index 4eae2e0..995f0bd 100755
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@
         'Topic :: Security :: Cryptography',
     ],
     install_requires=[
-        'pyasn1 >= 0.0.13',
+        'pyasn1 >= 0.1.3',
     ],
     entry_points={ 'console_scripts': [
         'pyrsa-priv2pub = rsa.util:private_to_public',