diff --git a/poetry.lock b/poetry.lock
index cabfc88..35e5400 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -690,15 +690,15 @@ category = "dev"
 description = "Pytest plugin for measuring coverage."
 name = "pytest-cov"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.8.1"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "2.9.0"
 
 [package.dependencies]
 coverage = ">=4.4"
 pytest = ">=3.6"
 
 [package.extras]
-testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "virtualenv"]
+testing = ["fields", "hunter", "process-tests (2.0.2)", "six", "pytest-xdist", "virtualenv"]
 
 [[package]]
 category = "dev"
@@ -1187,7 +1187,7 @@ docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["jaraco.itertools", "func-timeout"]
 
 [metadata]
-content-hash = "4716080dea8098f1de49923766edf6861e2868765aabe295cdae2f4cc4239a9b"
+content-hash = "1e9ecde7bd717ca1e92991e772e88cb1b220fccc85c6c772e6b8854fcc39453f"
 python-versions = "^3.6"
 
 [metadata.files]
@@ -1538,8 +1538,8 @@ pytest = [
     {file = "pytest-5.4.2.tar.gz", hash = "sha256:eb2b5e935f6a019317e455b6da83dd8650ac9ffd2ee73a7b657a30873d67a698"},
 ]
 pytest-cov = [
-    {file = "pytest-cov-2.8.1.tar.gz", hash = "sha256:cc6742d8bac45070217169f5f72ceee1e0e55b0221f54bcf24845972d3a47f2b"},
-    {file = "pytest_cov-2.8.1-py2.py3-none-any.whl", hash = "sha256:cdbdef4f870408ebdbfeb44e63e07eb18bb4619fae852f6e760645fa36172626"},
+    {file = "pytest-cov-2.9.0.tar.gz", hash = "sha256:b6a814b8ed6247bd81ff47f038511b57fe1ce7f4cc25b9106f1a4b106f1d9322"},
+    {file = "pytest_cov-2.9.0-py2.py3-none-any.whl", hash = "sha256:c87dfd8465d865655a8213859f1b4749b43448b5fae465cb981e16d52a811424"},
 ]
 pytest-mock = [
     {file = "pytest-mock-3.1.0.tar.gz", hash = "sha256:ce610831cedeff5331f4e2fc453a5dd65384303f680ab34bee2c6533855b431c"},
diff --git a/pyproject.toml b/pyproject.toml
index 0a83418..55005e9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ rich = "^1.2.2"
 [tool.poetry.dev-dependencies]
 pytest = "^5.4.2"
 coverage = {extras = ["toml"], version = "^5.0.1"}
-pytest-cov = "^2.8.1"
+pytest-cov = "^2.9.0"
 flake8 = "^3.8.2"
 black = "^19.10b0"
 flake8-black = "^0.2.0"