diff --git a/CHANGELOG.md b/CHANGELOG.md
index efa82a2..115c93b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Adopted more `ruff` rules.
 
+### Testing
+
+- Improved tox config.
+- Now store `hypothesis` and `pytest` cache in `.cache` directory.
+
 ## [6.0] - 2023-11-19
 
 ### Added
diff --git a/pyproject.toml b/pyproject.toml
index e0305f3..67dc17c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -113,14 +113,26 @@ Tracker = "https://github.com/xymy/gethash/issues"
 path = "src/gethash/__init__.py"
 
 [tool.hatch.envs.default]
-type = "virtual"
 path = ".venv"
 system-packages = true
 features = ["all", "docs", "lint", "test"]
 
+[tool.hatch.envs.default.env-vars]
+COVERAGE_FILE = "{root}{/}.coverage"
+HYPOTHESIS_STORAGE_DIRECTORY = "{root}{/}.cache{/}hypothesis"
+
 [tool.hatch.envs.default.scripts]
-test = ["coverage erase", "python -m pytest {args}", "coverage report"]
 docs = "python {root}{/}docs{/}release.py {args}"
+lint = [
+    "black {root}{/}src {root}{/}tests",
+    "ruff {root}{/}src {root}{/}tests",
+    "mypy {root}{/}src {root}{/}tests",
+]
+test = [
+    "coverage erase",
+    "python -m pytest -o cache_dir={root}{/}.cache{/}pytest --cov-report=html:{root}{/}htmlcov {args}",
+    "coverage report",
+]
 
 [tool.black]
 line-length = 120
diff --git a/tox.ini b/tox.ini
index 1ff31f7..6877f29 100644
--- a/tox.ini
+++ b/tox.ini
@@ -13,15 +13,27 @@ package = wheel
 wheel_build_env = .pkg
 
 [testenv:py3{9,10,11,12}]
+pass_env =
+    PYTEST_*
 set_env =
-    COVERAGE_FILE = {env:COVERAGE_FILE:{envdir}{/}.coverage}
+    COVERAGE_FILE = {envdir}{/}.coverage
+    HYPOTHESIS_STORAGE_DIRECTORY = {envdir}{/}.cache{/}hypothesis
 extras =
     test
 commands =
     coverage erase
-    python -m pytest -v --cov-report=html:{envdir}{/}htmlcov {posargs}
+    python -m pytest -v -o cache_dir={envdir}{/}.cache{/}pytest \
+        --cov-report=html:{envdir}{/}htmlcov {posargs}
     coverage report
 
+[testenv:lint]
+extras =
+    lint
+commands =
+    black {toxinidir}{/}src {toxinidir}{/}tests
+    ruff --cache-dir={envdir}{/}.cache{/}ruff {toxinidir}{/}src {toxinidir}{/}tests
+    mypy --cache-dir={envdir}{/}.cache{/}mypy {toxinidir}{/}src {toxinidir}{/}tests
+
 [testenv:docs]
 extras =
     docs
@@ -37,7 +49,7 @@ package = editable
 system_site_packages = true
 
 [pytest]
-addopts = --strict-markers --cov --cov-context=test --cov-report=html
+addopts = --strict-markers --cov --cov-context=test
 filterwarnings =
     error
     ignore::DeprecationWarning