diff --git a/poetry.lock b/poetry.lock
index 238c4b1..f8214a6 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -345,15 +345,15 @@ 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"
@@ -715,8 +715,8 @@ pytest = [
     {file = "pytest-5.4.1.tar.gz", hash = "sha256:84dde37075b8805f3d1f392cc47e38a0e59518fb46a431cfdaf7cf1ce805f970"},
 ]
 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"},