diff --git a/pyproject.toml b/pyproject.toml
index 8ea4ce8..513a48e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -110,3 +110,28 @@ ignore_errors = true
 module = ["imlib.cells.*"]
 ignore_errors = false
 strict = true
+
+[tool.tox]
+legacy_tox_ini = """
+[tox]
+envlist = py{39,310,311}
+isolated_build = True
+
+[gh-actions]
+python =
+    3.9: py39
+    3.10: py310
+    3.11: py311
+
+[testenv]
+extras =
+    dev
+commands =
+    pytest -v --color=yes --cov=brainglobe_utils --cov-report=xml
+passenv =
+    CI
+    GITHUB_ACTIONS
+    DISPLAY
+    XAUTHORITY
+    PYVISTA_OFF_SCREEN
+"""
diff --git a/tox.ini b/tox.ini
deleted file mode 100644
index 3857869..0000000
--- a/tox.ini
+++ /dev/null
@@ -1,21 +0,0 @@
-[tox]
-envlist = py{39,310,311}
-isolated_build = True
-
-[gh-actions]
-python =
-    3.9: py39
-    3.10: py310
-    3.11: py311
-
-[testenv]
-extras =
-    dev
-commands =
-    pytest -v --color=yes --cov=brainglobe_utils --cov-report=xml
-passenv =
-    CI
-    GITHUB_ACTIONS
-    DISPLAY
-    XAUTHORITY
-    PYVISTA_OFF_SCREEN