diff --git a/i3toolwait b/i3toolwait
index 6d55b04..ee90a29 100755
--- a/i3toolwait
+++ b/i3toolwait
@@ -2,13 +2,14 @@
 # -*- coding: utf-8 -*-
 
 
+import asyncio
 import functools
 import json
-import time
 
 import yaml
 import click
 import i3ipc
+import i3ipc.aio
 
 try:
     from yaml import CSafeLoader as SafeLoader
@@ -153,7 +154,7 @@ expression_mapping = {
     '<': LtExpression,
 }
 
-def group_tokens(tokens: list[str]):
+def group_tokens(tokens: list[str]) -> list[list[str]]:
     groups = []
     current_group = []
     
@@ -268,9 +269,8 @@ def parse(s: str) -> Expression:
     tokens = tokenize(s)
     return build_expression(tokens)
 
-
-def window_new(configs, debug):
-    def callback(ipc, e):
+def window_new(configs: list[dict], debug: bool):
+    async def callback(ipc: i3ipc.aio.Connection, e: i3ipc.WorkspaceEvent):
         assert e.change == 'new'
         if debug:
             print(json.dumps(e.ipc_data))
@@ -279,13 +279,31 @@ def window_new(configs, debug):
             workspace = cfg['workspace']
             if filter.reduce(e.ipc_data):
                 container_id = e.ipc_data['container']['id']
-                ipc.command(f'for_window [con_id="{container_id}"] focus')
-                ipc.command(f'for_window [con_id="{container_id}"] move container to workspace {workspace}')
+                await ipc.command(f'for_window [con_id="{container_id}"] focus')
+                await ipc.command(f'for_window [con_id="{container_id}"] move container to workspace {workspace}')
                 configs.pop(i)
             if not configs:
                 ipc.main_quit()
     return callback
 
+async def run(configs: list[dict], *, timeout: int, debug: bool):
+    ipc = await i3ipc.aio.Connection().connect()
+    ipc.on('window::new', window_new(configs, debug=debug))
+
+    coroutines = []
+    for cfg in configs:
+        cfg['filter'] = parse(cfg['filter'])
+        p = cfg['program']
+        if isinstance(p, list):
+            p = ' '.join(p)
+        coroutines += [ipc.command(f'exec {p}')]
+    await asyncio.gather(*coroutines)
+    try:
+        await asyncio.wait_for(ipc.main(), timeout=timeout/1000)
+    except asyncio.TimeoutError:
+        return 1
+    return 0
+
 @click.group()
 @click.pass_context
 @click.option('--debug', '-d', default=False, is_flag=True, help="Enable debug mode, will log ipc dictionary.")
@@ -309,22 +327,8 @@ def simple(ctx, filter, timeout, workspace, program):
         1    when no window has been found.
     """
     debug = ctx.obj['DEBUG']
-    filter = parse(filter)
-    program = ' '.join(program)
-
-    configs=[
-        {
-            "filter": filter,
-            "workspace": workspace,
-        },
-    ]
-    ipc = i3ipc.Connection()
-    ipc.on('window::new', window_new(configs, debug=debug))
-    ipc.command(f'exec {program}')
-    started_at = time.monotonic_ns() // (1000*1000)
-    ipc.main(timeout=timeout / 1000)
-    total_time = time.monotonic_ns() // (1000*1000) - started_at 
-    ctx.exit(int(total_time >= timeout))
+    configs=[{"filter": filter, "workspace": workspace, "program": program}]
+    ctx.exit(asyncio.run(run(configs, timeout=timeout, debug=debug)))
 
 @main.command()
 @click.pass_context
@@ -341,20 +345,7 @@ def config(ctx, timeout, configs):
     """
     debug = ctx.obj['DEBUG']
     configs = yaml.load(configs, Loader=SafeLoader)
-
-    ipc = i3ipc.Connection()
-    ipc.on('window::new', window_new(configs, debug=debug))
-
-    for cfg in configs:
-        cfg['filter'] = parse(cfg['filter'])
-        p = cfg['program']
-        if isinstance(p, list):
-            p = ' '.join(p)
-        ipc.command(f'exec {p}')
-    started_at = time.monotonic_ns() // (1000*1000)
-    ipc.main(timeout=timeout / 1000)
-    total_time = time.monotonic_ns() // (1000*1000) - started_at 
-    ctx.exit(int(total_time >= timeout))
+    ctx.exit(asyncio.run(run(configs, timeout=timeout, debug=debug)))
 
 if __name__ == '__main__':
     main()