diff --git a/poetry.lock b/poetry.lock
index f4605b0..b0d7e19 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -26,7 +26,7 @@ python-versions = ">=3.5"
 dev = ["cloudpickle", "coverage[toml] (>=5.0.2)", "furo", "hypothesis", "mypy (>=0.900,!=0.940)", "pre-commit", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "sphinx", "sphinx-notfound-page", "zope.interface"]
 docs = ["furo", "sphinx", "sphinx-notfound-page", "zope.interface"]
 tests = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "zope.interface"]
-tests_no_zope = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins"]
+tests-no-zope = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins"]
 
 [[package]]
 name = "babel"
@@ -97,7 +97,7 @@ optional = false
 python-versions = ">=3.5.0"
 
 [package.extras]
-unicode_backport = ["unicodedata2"]
+unicode-backport = ["unicodedata2"]
 
 [[package]]
 name = "click"
@@ -265,12 +265,12 @@ accept-rom-license = ["autorom[accept-rom-license] (>=0.4.2,<0.5.0)"]
 all = ["ale-py (>=0.7.1,<0.8.0)", "ale-py (>=0.7.1,<0.8.0)", "box2d-py (==2.3.5)", "box2d-py (==2.3.5)", "lz4 (>=3.1.0)", "lz4 (>=3.1.0)", "mujoco_py (>=1.50,<2.0)", "mujoco_py (>=1.50,<2.0)", "pyglet (>=1.4.0)", "pyglet (>=1.4.0)", "pyglet (>=1.4.0)", "pyglet (>=1.4.0)", "scipy (>=1.4.1)", "scipy (>=1.4.1)"]
 atari = ["ale-py (>=0.7.1,<0.8.0)"]
 box2d = ["box2d-py (==2.3.5)", "pyglet (>=1.4.0)"]
-classic_control = ["pyglet (>=1.4.0)"]
+classic-control = ["pyglet (>=1.4.0)"]
 mujoco = ["mujoco_py (>=1.50,<2.0)"]
 nomujoco = ["ale-py (>=0.7.1,<0.8.0)", "box2d-py (==2.3.5)", "lz4 (>=3.1.0)", "pyglet (>=1.4.0)", "pyglet (>=1.4.0)", "scipy (>=1.4.1)"]
 other = ["lz4 (>=3.1.0)"]
 robotics = ["mujoco_py (>=1.50,<2.0)"]
-toy_text = ["scipy (>=1.4.1)"]
+toy-text = ["scipy (>=1.4.1)"]
 
 [[package]]
 name = "idna"
@@ -601,7 +601,7 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.
 
 [[package]]
 name = "pytest-cov"
-version = "3.0.0"
+version = "4.0.0"
 description = "Pytest plugin for measuring coverage."
 category = "dev"
 optional = false
@@ -665,7 +665,7 @@ urllib3 = ">=1.21.1,<1.27"
 
 [package.extras]
 socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
-use_chardet_on_py3 = ["chardet (>=3.0.2,<5)"]
+use-chardet-on-py3 = ["chardet (>=3.0.2,<5)"]
 
 [[package]]
 name = "rospkg"
@@ -772,7 +772,7 @@ Sphinx = ">=3.0"
 
 [package.extras]
 test = ["Sphinx (>=3.2.0)", "dataclasses", "pytest (>=3.1.0)", "sphobjinv (>=2.0)", "typing-extensions (>=3.5)"]
-type_comments = ["typed-ast (>=1.4.0)"]
+type-comments = ["typed-ast (>=1.4.0)"]
 
 [[package]]
 name = "sphinx-rtd-theme"
@@ -931,7 +931,7 @@ testing = ["func-timeout", "jaraco.itertools", "pytest (>=4.6)", "pytest-black (
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6.2"
-content-hash = "bf862ea8ae0c771c8922977e70528fc101d2c97ec6ffed4a6f56d621b3ff5954"
+content-hash = "7b7f74f3ab979f49df6f22d7190bb95197f448e92152b2fe1492ad934d35bde4"
 
 [metadata.files]
 alabaster = [
@@ -1481,8 +1481,8 @@ pytest = [
     {file = "pytest-7.0.1.tar.gz", hash = "sha256:e30905a0c131d3d94b89624a1cc5afec3e0ba2fbdb151867d8e0ebd49850f171"},
 ]
 pytest-cov = [
-    {file = "pytest-cov-3.0.0.tar.gz", hash = "sha256:e7f0f5b1617d2210a2cabc266dfe2f4c75a8d32fb89eafb7ad9d06f6d076d470"},
-    {file = "pytest_cov-3.0.0-py3-none-any.whl", hash = "sha256:578d5d15ac4a25e5f961c938b85a05b09fdaae9deef3bb6de9a6e766622ca7a6"},
+    {file = "pytest-cov-4.0.0.tar.gz", hash = "sha256:996b79efde6433cdbd0088872dbc5fb3ed7fe1578b68cdbba634f14bb8dd0470"},
+    {file = "pytest_cov-4.0.0-py3-none-any.whl", hash = "sha256:2feb1b751d66a8bd934e5edfa2e961d11309dc37b73b0eabe73b5945fee20f6b"},
 ]
 python-dateutil = [
     {file = "python-dateutil-2.8.2.tar.gz", hash = "sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86"},
@@ -1627,7 +1627,6 @@ sphinxcontrib-serializinghtml = [
 ]
 tabulate = [
     {file = "tabulate-0.8.10-py3-none-any.whl", hash = "sha256:0ba055423dbaa164b9e456abe7920c5e8ed33fcc16f6d1b2f2d152c8e1e8b4fc"},
-    {file = "tabulate-0.8.10-py3.8.egg", hash = "sha256:436f1c768b424654fce8597290d2764def1eea6a77cfa5c33be00b1bc0f4f63d"},
     {file = "tabulate-0.8.10.tar.gz", hash = "sha256:6c57f3f3dd7ac2782770155f3adb2db0b1a269637e42f27599925e64b114f519"},
 ]
 termcolor = [
diff --git a/pyproject.toml b/pyproject.toml
index f7f2092..eee3f54 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,7 @@ eagerx = "^0.1.32"
 [tool.poetry.dev-dependencies]
 black = "^22.3.0"
 pytest = "^7.0"
-pytest-cov = "^3.0.0"
+pytest-cov = "^4.0.0"
 flake8= ">=3"
 flake8-bugbear = "^22.3.23"