diff --git a/.circleci/config.yml b/.circleci/config.yml
index 812bc16..f8cbe31 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -36,7 +36,7 @@ jobs:
     steps:
       - checkout
       - run: echo 'export PATH=$HOME/.local/bin:$PATH' >> $BASH_ENV
-      - run: pip install --user tox
+      - run: pip install --user tox "virtualenv<20.22.0"
       - run: tox
   test_nooptionals:
     parameters:
diff --git a/README.md b/README.md
index 3242702..0f3cb45 100644
--- a/README.md
+++ b/README.md
@@ -434,7 +434,7 @@ metrics_app = make_asgi_app()
 app.mount("/metrics", metrics_app)
 ```
 
-For Multiprocessing support, use this modified code snippet. Full multiprocessing intstructions are provided [here](https://github.com/prometheus/client_python#multiprocess-mode-eg-gunicorn).
+For Multiprocessing support, use this modified code snippet. Full multiprocessing instructions are provided [here](https://github.com/prometheus/client_python#multiprocess-mode-eg-gunicorn).
 
 ```python
 from fastapi import FastAPI
diff --git a/prometheus_client/bridge/graphite.py b/prometheus_client/bridge/graphite.py
index 3000980..8cadbed 100755
--- a/prometheus_client/bridge/graphite.py
+++ b/prometheus_client/bridge/graphite.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 import logging
 import re
diff --git a/setup.py b/setup.py
index c5eea5e..4b320dc 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 setup(
     name="prometheus_client",
-    version="0.17.0",
+    version="0.17.1",
     author="Brian Brazil",
     author_email="brian.brazil@robustperception.io",
     description="Python client for the Prometheus monitoring system.",
diff --git a/tox.ini b/tox.ini
index f1d4d1c..3a5e23b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,17 +1,15 @@
 [tox]
 envlist = coverage-clean,py3.6,py3.7,py3.8,py3.9,py3.10,py3.11,pypy3.7,py3.9-nooptionals,coverage-report,flake8,isort,mypy
 
-[base]
+[testenv]
 deps =
     coverage
     pytest
     attrs
-
-[testenv]
-deps =
-    {[base]deps}
     {py3.7,pypy3.7}: twisted
-    {py3.7,pypy3.7}: asgiref
+    py3.7: asgiref
+    # See https://github.com/django/asgiref/issues/393 for why we need to pin asgiref for pypy
+    pypy3.7: asgiref==3.6.0
 commands = coverage run --parallel -m pytest {posargs}
 
 [testenv:py3.9-nooptionals]