diff --git a/README.rst b/README.rst
index c7665604e..42df1790f 100644
--- a/README.rst
+++ b/README.rst
@@ -5,7 +5,7 @@ Electrum - Lightweight Bitcoin client
 
   Licence: MIT Licence
   Author: Thomas Voegtlin
-  Language: Python
+  Language: Python (>= 3.6)
   Homepage: https://electrum.org/
 
 
diff --git a/contrib/requirements/requirements.txt b/contrib/requirements/requirements.txt
index 85dd81bee..6585a4b70 100644
--- a/contrib/requirements/requirements.txt
+++ b/contrib/requirements/requirements.txt
@@ -7,6 +7,6 @@ dnspython
 jsonrpclib-pelix
 qdarkstyle<3.0
 typing>=3.0.0
-aiorpcx>=0.7.1
+aiorpcx>=0.7.1,<0.8
 aiohttp
 aiohttp_socks
diff --git a/setup.py b/setup.py
index fefd32c56..9da14c01c 100755
--- a/setup.py
+++ b/setup.py
@@ -20,8 +20,8 @@ with open('contrib/requirements/requirements-hw.txt') as f:
 
 version = imp.load_source('version', 'electrum/version.py')
 
-if sys.version_info[:3] < (3, 4, 0):
-    sys.exit("Error: Electrum requires Python version >= 3.4.0...")
+if sys.version_info[:3] < (3, 6, 0):
+    sys.exit("Error: Electrum requires Python version >= 3.6.0...")
 
 data_files = []
 
@@ -71,6 +71,7 @@ class CustomInstallCommand(install):
 setup(
     name="Electrum",
     version=version.ELECTRUM_VERSION,
+    python_requires='>=3.6',
     install_requires=requirements,
     extras_require=extras_require,
     packages=[