diff --git a/pyproject.toml b/pyproject.toml
index 6641f16f..74a1cfcf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -32,7 +32,7 @@ dependencies = [
 dev = [
     "black[jupyter] >= 22,<23",
     "isort>=5.0,<5.11",
-    "tox>=3.20,<3.28",
+    "tox>=3.20,<4.1",
     "twine>=3.3,<4.1",  # Used to make releases to PyPI
 ]
 doc = [
@@ -63,7 +63,7 @@ tests = [
     "pytest-console-scripts>=1.1,<1.4",
     "pytest-cov>=2.10,<4.1",
     "rstcheck[sphinx,toml]>=5.0,<6.2",
-    "tox>=3.20,<3.28",
+    "tox>=3.20,<4.1",
 ]
 viz = [
     "plotly>5.10,<=5.11",