diff --git a/poetry.lock b/poetry.lock
index 93dc5bf6..d7db7645 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -246,6 +246,9 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
+[package.dependencies]
+toml = {version = "*", optional = true, markers = "extra == \"toml\""}
+
 [package.extras]
 toml = ["toml"]
 
@@ -819,16 +822,15 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xm
 
 [[package]]
 name = "pytest-cov"
-version = "2.12.1"
+version = "3.0.0"
 description = "Pytest plugin for measuring coverage."
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.6"
 
 [package.dependencies]
-coverage = ">=5.2.1"
+coverage = {version = ">=5.2.1", extras = ["toml"]}
 pytest = ">=4.6"
-toml = "*"
 
 [package.extras]
 testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
@@ -1396,7 +1398,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytes
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.8.0,<3.10"
-content-hash = "6fdb04887c3c41ea69f2e635dec451cd1cb934d74626ffa4b82d23316c627ee1"
+content-hash = "a7fead71c592cf3af0de02e58056765a3369d046e0e31db7f0c225ef29873cc9"
 
 [metadata.files]
 alabaster = [
@@ -1957,8 +1959,8 @@ pytest = [
     {file = "pytest-6.2.5.tar.gz", hash = "sha256:131b36680866a76e6781d13f101efb86cf674ebb9762eb70d3082b6f29889e89"},
 ]
 pytest-cov = [
-    {file = "pytest-cov-2.12.1.tar.gz", hash = "sha256:261ceeb8c227b726249b376b8526b600f38667ee314f910353fa318caa01f4d7"},
-    {file = "pytest_cov-2.12.1-py2.py3-none-any.whl", hash = "sha256:261bb9e47e65bd099c89c3edf92972865210c36813f80ede5277dceb77a4a62a"},
+    {file = "pytest-cov-3.0.0.tar.gz", hash = "sha256:e7f0f5b1617d2210a2cabc266dfe2f4c75a8d32fb89eafb7ad9d06f6d076d470"},
+    {file = "pytest_cov-3.0.0-py3-none-any.whl", hash = "sha256:578d5d15ac4a25e5f961c938b85a05b09fdaae9deef3bb6de9a6e766622ca7a6"},
 ]
 pytest-runner = [
     {file = "pytest-runner-5.3.1.tar.gz", hash = "sha256:0fce5b8dc68760f353979d99fdd6b3ad46330b6b1837e2077a89ebcf204aac91"},
diff --git a/pyproject.toml b/pyproject.toml
index 89b1d8f0..f65794c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,7 +48,7 @@ coverage = "5.5"
 twine = "3.4.2"
 pytest = "6.2.5"
 pytest-runner = "5.3.1"
-pytest-cov = "2.12.1"
+pytest-cov = "3.0.0"
 Sphinx = "4.2.0"
 sphinx-click = "3.0.1"
 sphinx-issues = "1.2.0"