1 files changed, 2 insertions, 2 deletions
diff --git a/setup.py b/setup.py
index ad957329..31d67139 100644
--- a/setup.py
+++ b/setup.py
@@ -77,7 +77,7 @@ setup(
         'Programming Language :: Python :: 3.5',
     ],
     install_requires=[
-        'pycrypto>=2.1,!=2.4',
-        'ecdsa>=0.11',
+        'pycrypto>=2.1,!=2.4,<3.0',
+        'ecdsa>=0.11,<2.0',
     ],
 )