diff --git a/poetry.lock b/poetry.lock
index f2ccc3e..3e4b6ed 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -38,11 +38,11 @@ python-versions = "*"
 
 [[package]]
 name = "black"
-version = "22.8.0"
+version = "22.10.0"
 description = "The uncompromising code formatter."
 category = "dev"
 optional = false
-python-versions = ">=3.6.2"
+python-versions = ">=3.7"
 
 [package.dependencies]
 click = ">=8.0.0"
@@ -73,11 +73,11 @@ importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "colorama"
-version = "0.4.5"
+version = "0.4.6"
 description = "Cross-platform colored terminal text."
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
 
 [[package]]
 name = "decorator"
@@ -473,13 +473,14 @@ python-versions = ">=3.7"
 
 [[package]]
 name = "traitlets"
-version = "5.4.0"
+version = "5.5.0"
 description = ""
 category = "dev"
 optional = false
 python-versions = ">=3.7"
 
 [package.extras]
+docs = ["myst-parser", "pydata-sphinx-theme", "sphinx"]
 test = ["pre-commit", "pytest"]
 
 [[package]]
@@ -500,7 +501,7 @@ python-versions = "*"
 
 [[package]]
 name = "typing-extensions"
-version = "4.3.0"
+version = "4.4.0"
 description = "Backported and Experimental Type Hints for Python 3.7+"
 category = "dev"
 optional = false
@@ -516,15 +517,15 @@ python-versions = "*"
 
 [[package]]
 name = "zipp"
-version = "3.8.1"
+version = "3.10.0"
 description = "Backport of pathlib-compatible object wrapper for zip files"
 category = "dev"
 optional = false
 python-versions = ">=3.7"
 
 [package.extras]
-docs = ["sphinx", "jaraco.packaging (>=9)", "rst.linker (>=1.9)", "jaraco.tidelift (>=1.4)"]
-testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.3)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)"]
+docs = ["sphinx (>=3.5)", "jaraco.packaging (>=9)", "rst.linker (>=1.9)", "furo", "jaraco.tidelift (>=1.4)"]
+testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "flake8 (<5)", "pytest-cov", "pytest-enabler (>=1.3)", "jaraco.itertools", "func-timeout", "jaraco.functools", "more-itertools", "pytest-black (>=0.3.7)", "pytest-mypy (>=0.9.1)"]
 
 [extras]
 cjk = ["mecab-python3", "ipadic", "mecab-ko-dic", "jieba"]
diff --git a/tox.ini b/tox.ini
index 1d5cff9..9567bbb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,9 @@
 [tox]
-envlist = py37, py38, py39, py310
+envlist = py37, py38, py39, py310, py311
+isolated_build = true
 
 [testenv]
-deps = pytest
-commands = pytest
+skip_install = true
+whitelist_externals = poetry
+commands_pre = poetry install
+commands = poetry run pytest --import-mode importlib
diff --git a/wordfreq/__init__.py b/wordfreq/__init__.py
index e46aefc..54d45b2 100644
--- a/wordfreq/__init__.py
+++ b/wordfreq/__init__.py
@@ -11,9 +11,9 @@ import logging
 import math
 import warnings
 
-from .tokens import tokenize, simple_tokenize, lossy_tokenize
-from .language_info import get_language_info
-from .numbers import digit_freq, has_digit_sequence, smash_numbers
+from wordfreq.tokens import tokenize, simple_tokenize, lossy_tokenize
+from wordfreq.language_info import get_language_info
+from wordfreq.numbers import digit_freq, has_digit_sequence, smash_numbers
 
 logger = logging.getLogger(__name__)