diff --git a/poetry.lock b/poetry.lock
index 1f14c88b..bb8d342e 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -151,6 +151,9 @@ 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"]
 
@@ -695,14 +698,14 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xm
 
 [[package]]
 name = "pytest-cov"
-version = "2.11.1"
+version = "2.12.0"
 description = "Pytest plugin for measuring coverage."
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
-coverage = ">=5.2.1"
+coverage = {version = ">=5.2.1", extras = ["toml"]}
 pytest = ">=4.6"
 
 [package.extras]
@@ -891,7 +894,7 @@ jupyter = ["ipywidgets"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6"
-content-hash = "3e70e4d0863ade176fcab5419bdcf39ccd3877a805cfa3a1cabd5e3ce356bc81"
+content-hash = "5e13fd03c241b8d4ba9f459d5e278c25f8bf02934200ac94fc0ab81e56d3202b"
 
 [metadata.files]
 appdirs = [
@@ -1287,8 +1290,8 @@ pytest = [
     {file = "pytest-6.2.4.tar.gz", hash = "sha256:50bcad0a0b9c5a72c8e4e7c9855a3ad496ca6a881a3641b4260605450772c54b"},
 ]
 pytest-cov = [
-    {file = "pytest-cov-2.11.1.tar.gz", hash = "sha256:359952d9d39b9f822d9d29324483e7ba04a3a17dd7d05aa6beb7ea01e359e5f7"},
-    {file = "pytest_cov-2.11.1-py2.py3-none-any.whl", hash = "sha256:bdb9fdb0b85a7cc825269a4c56b48ccaa5c7e365054b6038772c32ddcdc969da"},
+    {file = "pytest-cov-2.12.0.tar.gz", hash = "sha256:8535764137fecce504a49c2b742288e3d34bc09eed298ad65963616cc98fd45e"},
+    {file = "pytest_cov-2.12.0-py2.py3-none-any.whl", hash = "sha256:95d4933dcbbacfa377bb60b29801daa30d90c33981ab2a79e9ab4452c165066e"},
 ]
 python-dateutil = [
     {file = "python-dateutil-2.8.1.tar.gz", hash = "sha256:73ebfe9dbf22e832286dafa60473e4cd239f8592f699aa5adaf10050e6e1823c"},
diff --git a/pyproject.toml b/pyproject.toml
index c6dd9901..acbbed3b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ jupyter = ["ipywidgets"]
 pytest = "^6.2.3"
 black = "^20.8b1"
 mypy = "^0.812"
-pytest-cov = "^2.11.1"
+pytest-cov = "^2.12.0"
 attrs = "^21.2.0"
 
 [build-system]