diff --git a/pyproject.toml b/pyproject.toml
index 6a3b23d..223b8c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,8 +24,8 @@ classifiers = [
 ]
 requires-python = ">= 3.7"
 dependencies = [
-    "matplotlib>=3.1,<4",
-    "sympy>=1.2,<2",
+    "matplotlib >= 3.1, <4",
+    "sympy >= 1.2, <2",
 ]
 dynamic = ["version"]
 
diff --git a/tox.ini b/tox.ini
index 1fc2c2d..57cbe17 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,7 +24,7 @@ exclude_lines =
     if __name__ == .__main__.:
 
 [tox]
-envlist = py3{7,8,9,10,11}-{low,high}, flake8, mypy, black, pylint, pydocstyle, coverage, isort, ruff
+envlist = py3{7,8,9,10,11}, flake8, mypy, black, pylint, pydocstyle, coverage, isort, ruff
 isolated_build = True
 skip_missing_interpreters = True
 
@@ -33,17 +33,13 @@ deps =
   pytest
   coverage
   hypothesis
-  low: matplotlib==3.1
-  low: sympy==1.2
-  high: matplotlib<4
-  high: sympy<2
 commands = coverage run -m pytest -m "not slow"
 setenv =
   COVERAGE_FILE={toxworkdir}/.coverage.{envname}
 
 [testenv:coverage]
 deps = coverage
-depends = py37-low, py38-low, py39-low
+depends = py37, py38, py39, py310, py311
 parallel_show_output = True
 skip_install = True
 setenv = COVERAGE_FILE={toxworkdir}/.coverage