diff --git a/src/snek/service/channel_message.py b/src/snek/service/channel_message.py
index 7f21282..6fc7bc5 100644
--- a/src/snek/service/channel_message.py
+++ b/src/snek/service/channel_message.py
@@ -16,7 +16,7 @@ class ChannelMessageService(BaseService):
 
     def get_or_create_executor(self, user_uid):
         if not user_uid in self._executor_pools:
-            self._executor_pools[user_uid] = ThreadPoolExecutor(max_workers=5)
+            self._executor_pools[user_uid] = ThreadPoolExecutor(max_workers=1)
         return self._executor_pools[user_uid]
 
     async def maintenance(self):