diff --git a/poetry.lock b/poetry.lock
index fd8e9aa..07d83b2 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -276,19 +276,18 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xm
 
 [[package]]
 name = "pytest-cov"
-version = "2.12.1"
+version = "4.1.0"
 description = "Pytest plugin for measuring coverage."
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.7"
 files = [
-    {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-4.1.0.tar.gz", hash = "sha256:3904b13dfbfec47f003b8e77fd5b589cd11904a21ddf1ab38a64f204d6a10ef6"},
+    {file = "pytest_cov-4.1.0-py3-none-any.whl", hash = "sha256:6ba70b9e97e69fcc3fb45bfeab2d0a138fb65c4d0d6a41ef33983ad114be8c3a"},
 ]
 
 [package.dependencies]
-coverage = ">=5.2.1"
+coverage = {version = ">=5.2.1", extras = ["toml"]}
 pytest = ">=4.6"
-toml = "*"
 
 [package.extras]
 testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtualenv"]
@@ -357,4 +356,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "1d3e786ea96f512989dbb9aa815ab08c9546bc7c2e4abe07f84d1b2d7ee783b5"
+content-hash = "45c605296f97b72a3fc69e19e251afb2c17fbf5361f182434053b51b4168e1c1"
diff --git a/pyproject.toml b/pyproject.toml
index 8e2ef67..1c81d5e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ classifiers = [
 python = "^3.8"
 numpy = "^1.19.3"
 chardet = "^4.0.0"
-pytest-cov = "^2.10.1"
+pytest-cov = "^4.0.0"
 pandas = "^1.1.3"
 
 [tool.poetry.dev-dependencies]