diff --git a/electrumx/server/controller.py b/electrumx/server/controller.py
index acb8a9a..868a1f3 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, 10, 4) <= aiorpcx_version < (0, 11):
-            raise RuntimeError('aiorpcX version 0.10.x, x >= 4, required')
+        if not (0, 11, 0) <= aiorpcx_version < (0, 12):
+            raise RuntimeError('aiorpcX version 0.11.x 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 8b4bf8b..37023d3 100644
--- a/electrumx/server/session.py
+++ b/electrumx/server/session.py
@@ -262,8 +262,9 @@ class SessionManager(object):
                                  for session in stale_sessions)
                 self.logger.info(f'closing stale connections {text}')
                 # Give the sockets some time to close gracefully
-                for session in stale_sessions:
-                    await session.spawn(session.close())
+                async with TaskGroup() as group:
+                    for session in stale_sessions:
+                        await group.spawn(session.close())
 
             # Consolidate small groups
             bw_limit = self.env.bandwidth_limit
@@ -512,10 +513,9 @@ class SessionManager(object):
         finally:
             # Close servers then sessions
             await self._close_servers(list(self.servers.keys()))
-            for session in list(self.sessions):
-                await session.spawn(session.close(force_after=1))
-            for session in list(self.sessions):
-                await session.closed_event.wait()
+            async with TaskGroup() as group:
+                for session in list(self.sessions):
+                    await group.spawn(session.close(force_after=1))
 
     def session_count(self):
         '''The number of connections that we've sent something to.'''
@@ -573,8 +573,9 @@ class SessionManager(object):
             for hashX in set(hc).intersection(touched):
                 del hc[hashX]
 
-        for session in self.sessions:
-            await session.spawn(session.notify, touched, height_changed)
+        async with TaskGroup() as group:
+            for session in self.sessions:
+                await group.spawn(session.notify, touched, height_changed)
 
     def add_session(self, session):
         self.sessions.add(session)
diff --git a/setup.py b/setup.py
index 1a7ae25..cf37db6 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>=0.10.4,<0.11', 'attrs',
+    install_requires=['aiorpcX>=0.11.0,<0.12', 'attrs',
                       'plyvel', 'pylru', 'aiohttp >= 2'],
     packages=setuptools.find_packages(include=('electrumx*',)),
     description='ElectrumX Server',