diff --git a/setup.py b/setup.py
index 0e8f1e00..c778e450 100644
--- a/setup.py
+++ b/setup.py
@@ -65,7 +65,7 @@ setup(
     name="Electrum",
     version=version.ELECTRUM_VERSION,
     install_requires=[
-        'slowaes',
+        'slowaes>=0.1a1',
         'ecdsa>=0.9',
         'pbkdf2',
         'requests',