diff --git a/poetry.lock b/poetry.lock
index 251995c..0ca78b6 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -785,18 +785,18 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xm
 
 [[package]]
 name = "pytest-cov"
-version = "2.12.0"
+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 = {version = ">=5.2.1", extras = ["toml"]}
 pytest = ">=4.6"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests (==2.0.2)", "six", "pytest-xdist", "virtualenv"]
+testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
 
 [[package]]
 name = "pytest-datafiles"
@@ -1172,7 +1172,7 @@ test = []
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.6.1,<4.0"
-content-hash = "16444a6a218f59929ec2fd996ee369e968abc70c73f3c8773f0c741a7db54482"
+content-hash = "665fb9dd0ae3e575ad101d647d8e8df637b5c031f8b3c42cb55a8bb5fdbadbd3"
 
 [metadata.files]
 appdirs = [
@@ -1369,8 +1369,10 @@ cryptography = [
     {file = "cryptography-3.4.7-cp36-abi3-win_amd64.whl", hash = "sha256:de4e5f7f68220d92b7637fc99847475b59154b7a1b3868fb7385337af54ac9ca"},
     {file = "cryptography-3.4.7-pp36-pypy36_pp73-manylinux2010_x86_64.whl", hash = "sha256:26965837447f9c82f1855e0bc8bc4fb910240b6e0d16a664bb722df3b5b06873"},
     {file = "cryptography-3.4.7-pp36-pypy36_pp73-manylinux2014_x86_64.whl", hash = "sha256:eb8cc2afe8b05acbd84a43905832ec78e7b3873fb124ca190f574dca7389a87d"},
+    {file = "cryptography-3.4.7-pp37-pypy37_pp73-macosx_10_10_x86_64.whl", hash = "sha256:b01fd6f2737816cb1e08ed4807ae194404790eac7ad030b34f2ce72b332f5586"},
     {file = "cryptography-3.4.7-pp37-pypy37_pp73-manylinux2010_x86_64.whl", hash = "sha256:7ec5d3b029f5fa2b179325908b9cd93db28ab7b85bb6c1db56b10e0b54235177"},
     {file = "cryptography-3.4.7-pp37-pypy37_pp73-manylinux2014_x86_64.whl", hash = "sha256:ee77aa129f481be46f8d92a1a7db57269a2f23052d5f2433b4621bb457081cc9"},
+    {file = "cryptography-3.4.7-pp37-pypy37_pp73-win_amd64.whl", hash = "sha256:bf40af59ca2465b24e54f671b2de2c59257ddc4f7e5706dbd6930e26823668d3"},
     {file = "cryptography-3.4.7.tar.gz", hash = "sha256:3d10de8116d25649631977cb37da6cbdd2d6fa0e0281d014a5b7d337255ca713"},
 ]
 dataclasses = [
@@ -1794,8 +1796,8 @@ pytest = [
     {file = "pytest-6.2.4.tar.gz", hash = "sha256:50bcad0a0b9c5a72c8e4e7c9855a3ad496ca6a881a3641b4260605450772c54b"},
 ]
 pytest-cov = [
-    {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"},
+    {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-datafiles = [
     {file = "pytest-datafiles-2.0.tar.gz", hash = "sha256:143329cbb1dbbb07af24f88fa4668e2f59ce233696cf12c49fd1c98d1756dbf9"},
diff --git a/pyproject.toml b/pyproject.toml
index 7d64bef..ace2947 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,7 +42,7 @@ psycopg2 = "^2.8.6"
 [tool.poetry.dev-dependencies]
 bumpversion = "^0.6.0"
 pytest = "^6.2.3"
-pytest-cov = "^2.11.1"
+pytest-cov = "^3.0.0"
 mock = "^4.0.3"
 mypy = "^0.812"
 codecov = "^2.1.11"