diff --git a/electrumx/server/controller.py b/electrumx/server/controller.py
index 01ab6c4..bf7d66e 100644
--- a/electrumx/server/controller.py
+++ b/electrumx/server/controller.py
@@ -82,8 +82,8 @@ class Controller(ServerBase):
         '''Start the RPC server and wait for the mempool to synchronize.  Then
         start serving external clients.
         '''
-        if not (0, 13, 2) <= aiorpcx_version < (0, 14):
-            raise RuntimeError('aiorpcX version 0.13.x, x>=2, is required')
+        if not (0, 13, 5) <= aiorpcx_version < (0, 14):
+            raise RuntimeError('aiorpcX version 0.13.0, x>=5, is required')
 
         env = self.env
         min_str, max_str = env.coin.SESSIONCLS.protocol_min_max_strings()
diff --git a/electrumx/server/session.py b/electrumx/server/session.py
index 901d023..24cc06d 100644
--- a/electrumx/server/session.py
+++ b/electrumx/server/session.py
@@ -735,6 +735,7 @@ class ElectrumX(SessionBase):
         self.mempool_statuses = {}
         self.set_request_handlers(self.PROTOCOL_MIN)
         self.is_peer = False
+        self.recalc_concurrency()
 
     @classmethod
     def protocol_min_max_strings(cls):
diff --git a/setup.py b/setup.py
index 8a3ee01..d7ac00e 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@ setuptools.setup(
     # "xevan_hash" package is required to sync Xuez network.
     # "groestlcoin_hash" package is required to sync Groestlcoin network.
     # "pycryptodomex" package is required to sync SmartCash network.
-    install_requires=['aiorpcX>=0.13.2,<0.14', 'attrs',
+    install_requires=['aiorpcX>=0.13.5,<0.14', 'attrs',
                       'plyvel', 'pylru', 'aiohttp >= 2'],
     packages=setuptools.find_packages(include=('electrumx*',)),
     description='ElectrumX Server',