diff --git a/poetry.lock b/poetry.lock
index a6d9248..9aea81d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -161,12 +161,15 @@ immutables = ">=0.9"
 
 [[package]]
 name = "coverage"
-version = "5.3"
+version = "5.5"
 description = "Code coverage measurement for Python"
 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"]
 
@@ -438,14 +441,14 @@ testing = ["async-generator (>=1.3)", "coverage", "hypothesis (>=5.7.1)"]
 
 [[package]]
 name = "pytest-cov"
-version = "2.10.1"
+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 = ">=4.4"
+coverage = {version = ">=5.2.1", extras = ["toml"]}
 pytest = ">=4.6"
 
 [package.extras]
@@ -663,7 +666,7 @@ testing = ["pytest (>=3.5,!=3.7.3)", "pytest-checkdocs (>=1.2.3)", "pytest-flake
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.6"
-content-hash = "002aca745c1f5006a522282b181e681a8da6875eaacd3ed4593ac394c3dd36d6"
+content-hash = "8b936b5d2c1b5b87385fa11718bc5304f6811ba8e9aa8aa5797a0f8054657ed9"
 
 [metadata.files]
 aiohttp = [
@@ -779,40 +782,58 @@ contextvars = [
     {file = "contextvars-2.4.tar.gz", hash = "sha256:f38c908aaa59c14335eeea12abea5f443646216c4e29380d7bf34d2018e2c39e"},
 ]
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@@ -975,28 +996,44 @@ pytest-virtualenv = [
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diff --git a/pyproject.toml b/pyproject.toml
index 2fdbd5d..c75aead 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ black = "^20.8b1"
 # tests
 pytest = "^6.1.2"
 pytest-asyncio = "^0.14.0"
-pytest-cov = "^2.8.1"
+pytest-cov = "^2.12.0"
 pytest-mock = "^3.3.1"
 pytest-virtualenv = "^1.7.0"
 requests = "^2.22.0"