diff --git a/format_novel/format_novel.py b/format_novel/format_novel.py
index 69ebf41..ab088a5 100755
--- a/format_novel/format_novel.py
+++ b/format_novel/format_novel.py
@@ -7,8 +7,8 @@ import docx
 
 
 def expand_chapter_range(chapter_request):
-    if not '-' in chapter_request:
-       return (int(chapter_request),)
+    if '-' not in chapter_request:
+        return (int(chapter_request),)
 
     chapter_range = chapter_request.split('-')
 
diff --git a/tests/run-ci-tests b/tests/run-ci-tests
index f10a100..375b610 100755
--- a/tests/run-ci-tests
+++ b/tests/run-ci-tests
@@ -8,8 +8,7 @@ set -e
 
 apk add --no-cache python3 py3-pip
 # If certain dependencies of black are available in this version of Alpine, install them.
-apk add --no-cache py3-typed-ast py3-regex || true
-python3 -m pip install --upgrade pip==22.2.2 setuptools==65.3.0
-pip3 install --ignore-installed tox==3.25.1
+apk add --no-cache py3-typed-ast py3-regex py3-pip || true
+pip3 install --ignore-installed tox==4.11.13
 export COVERAGE_FILE=/tmp/.coverage
 tox --workdir /tmp/.tox --sitepackages
diff --git a/tox.ini b/tox.ini
index fdfbb0e..37a6322 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,13 +1,12 @@
 [tox]
-envlist = py37,py38,py39,py310
+envlist = py38,py39,py310,py311
 skip_missing_interpreters = True
-skipsdist = True
-minversion = 3.14.1
+package = editable
+min_version = 4.0
 
 [testenv]
-usedevelop = True
 deps = -rtest_requirements.txt
-passenv = COVERAGE_FILE
+pass_env = COVERAGE_FILE
 commands =
     #pytest {posargs}
     py38,py39: black --check .