diff --git a/tests/test_asgi.py b/tests/test_asgi.py
index 78e24193..aa2cf1cf 100644
--- a/tests/test_asgi.py
+++ b/tests/test_asgi.py
@@ -48,9 +48,14 @@ def tearDown(self):
             asyncio.get_event_loop().run_until_complete(
                 self.communicator.wait()
             )
-            
+
+    async def create_communicator(self, app):
+        return ApplicationCommunicator(app, self.scope)
+
     def seed_app(self, app):
-        self.communicator = ApplicationCommunicator(app, self.scope)
+        self.communicator = asyncio.get_event_loop().run_until_complete(
+            self.create_communicator(app)
+        )
 
     def send_input(self, payload):
         asyncio.get_event_loop().run_until_complete(
@@ -148,9 +153,9 @@ def test_gzip(self):
         increments = 2
         self.increment_metrics(metric_name, help_text, increments)
         app = make_asgi_app(self.registry)
-        self.seed_app(app)
         # Send input with gzip header.
         self.scope["headers"] = [(b"accept-encoding", b"gzip")]
+        self.seed_app(app)
         self.send_input({"type": "http.request", "body": b""})
         # Assert outputs are compressed.
         outputs = self.get_all_output()
@@ -164,9 +169,9 @@ def test_gzip_disabled(self):
         self.increment_metrics(metric_name, help_text, increments)
         # Disable compression explicitly.
         app = make_asgi_app(self.registry, disable_compression=True)
-        self.seed_app(app)
         # Send input with gzip header.
         self.scope["headers"] = [(b"accept-encoding", b"gzip")]
+        self.seed_app(app)
         self.send_input({"type": "http.request", "body": b""})
         # Assert outputs are not compressed.
         outputs = self.get_all_output()
@@ -175,8 +180,8 @@ def test_gzip_disabled(self):
     def test_openmetrics_encoding(self):
         """Response content type is application/openmetrics-text when appropriate Accept header is in request"""
         app = make_asgi_app(self.registry)
-        self.seed_app(app)
         self.scope["headers"] = [(b"Accept", b"application/openmetrics-text")]
+        self.seed_app(app)
         self.send_input({"type": "http.request", "body": b""})
 
         content_type = self.get_response_header_value('Content-Type').split(";")[0]
diff --git a/tox.ini b/tox.ini
index deb74e14..f6c4f9ac 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,15 +1,14 @@
 [tox]
-envlist = coverage-clean,py{3.9,3.10,3.11,3.12,3.13,py3.9,3.9-nooptionals},coverage-report,flake8,isort,mypy
+envlist = coverage-clean,py{3.9.18,3.10,3.11,3.12,3.13,py3.9,3.9-nooptionals},coverage-report,flake8,isort,mypy
 
 [testenv]
 deps =
     coverage
     pytest
     attrs
-    {py3.9,pypy3.9}: twisted
-    # NOTE: Pinned due to https://github.com/prometheus/client_python/issues/1020
-    py3.9: asgiref==3.7
-    pypy3.9: asgiref==3.7
+    {py3.9.18,pypy3.9}: twisted
+    py3.9.18: asgiref
+    pypy3.9: asgiref
 commands = coverage run --parallel -m pytest {posargs}
 
 [testenv:py3.9-nooptionals]