diff --git a/poetry.lock b/poetry.lock
index 991e9d0..215c7ef 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,46 +1,43 @@
 [[package]]
-category = "main"
-description = "Bash tab completion for argparse"
 name = "argcomplete"
+version = "1.11.1"
+description = "Bash tab completion for argparse"
+category = "main"
 optional = false
 python-versions = "*"
-version = "1.11.1"
 
 [package.dependencies]
-[package.dependencies.importlib-metadata]
-python = ">=3.6,<3.7"
-version = ">=0.23,<2"
+importlib-metadata = {version = ">=0.23,<2", markers = "python_version == \"3.6\" or python_version == \"3.7\""}
 
 [package.extras]
 test = ["coverage", "flake8", "pexpect", "wheel"]
 
 [[package]]
-category = "dev"
-description = "Extension to the standard mock framework to support support async"
 name = "asyncmock"
+version = "0.4.2"
+description = "Extension to the standard mock framework to support support async"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
-version = "0.4.2"
 
 [package.dependencies]
 mock = "*"
 
 [[package]]
-category = "dev"
-description = "Atomic file writes."
-marker = "sys_platform == \"win32\""
 name = "atomicwrites"
+version = "1.4.0"
+description = "Atomic file writes."
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.4.0"
 
 [[package]]
-category = "dev"
-description = "Classes Without Boilerplate"
 name = "attrs"
+version = "19.3.0"
+description = "Classes Without Boilerplate"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "19.3.0"
 
 [package.extras]
 azure-pipelines = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface", "pytest-azurepipelines"]
@@ -49,40 +46,42 @@ docs = ["sphinx", "zope.interface"]
 tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 
 [[package]]
-category = "main"
-description = "Cross-platform colored terminal text."
 name = "colorama"
+version = "0.4.3"
+description = "Cross-platform colored terminal text."
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "0.4.3"
 
 [[package]]
-category = "dev"
-description = "Code coverage measurement for Python"
 name = "coverage"
+version = "6.0"
+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"
-version = "5.1"
+python-versions = ">=3.6"
+
+[package.dependencies]
+tomli = {version = "*", optional = true, markers = "extra == \"toml\""}
 
 [package.extras]
-toml = ["toml"]
+toml = ["tomli"]
 
 [[package]]
-category = "main"
-description = "Internationalized Domain Names in Applications (IDNA)"
 name = "idna"
+version = "2.9"
+description = "Internationalized Domain Names in Applications (IDNA)"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.9"
 
 [[package]]
-category = "main"
-description = "Read metadata from Python packages"
-marker = "python_version < \"3.8\""
 name = "importlib-metadata"
+version = "1.6.1"
+description = "Read metadata from Python packages"
+category = "main"
 optional = false
 python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
-version = "1.6.1"
 
 [package.dependencies]
 zipp = ">=0.5"
@@ -92,20 +91,20 @@ docs = ["sphinx", "rst.linker"]
 testing = ["packaging", "pep517", "importlib-resources (>=1.3)"]
 
 [[package]]
-category = "dev"
-description = "iniconfig: brain-dead simple config-ini parsing"
 name = "iniconfig"
+version = "1.0.0"
+description = "iniconfig: brain-dead simple config-ini parsing"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "1.0.0"
 
 [[package]]
-category = "dev"
-description = "Rolling backport of unittest.mock for all Pythons"
 name = "mock"
+version = "4.0.2"
+description = "Rolling backport of unittest.mock for all Pythons"
+category = "dev"
 optional = false
 python-versions = ">=3.6"
-version = "4.0.2"
 
 [package.extras]
 build = ["twine", "wheel", "blurb"]
@@ -113,64 +112,62 @@ docs = ["sphinx"]
 test = ["pytest", "pytest-cov"]
 
 [[package]]
-category = "dev"
-description = "More routines for operating on iterables, beyond itertools"
 name = "more-itertools"
+version = "8.4.0"
+description = "More routines for operating on iterables, beyond itertools"
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "8.4.0"
 
 [[package]]
-category = "main"
-description = "multidict implementation"
 name = "multidict"
+version = "4.7.6"
+description = "multidict implementation"
+category = "main"
 optional = false
 python-versions = ">=3.5"
-version = "4.7.6"
 
 [[package]]
-category = "dev"
-description = "Core utilities for Python packages"
 name = "packaging"
+version = "20.4"
+description = "Core utilities for Python packages"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "20.4"
 
 [package.dependencies]
 pyparsing = ">=2.0.2"
 six = "*"
 
 [[package]]
-category = "dev"
-description = "plugin and hook calling mechanisms for python"
 name = "pluggy"
+version = "0.13.1"
+description = "plugin and hook calling mechanisms for python"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "0.13.1"
 
 [package.dependencies]
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 
 [package.extras]
 dev = ["pre-commit", "tox"]
 
 [[package]]
-category = "dev"
-description = "library with cross-python path, ini-parsing, io, code, log facilities"
 name = "py"
+version = "1.8.2"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "1.8.2"
 
 [[package]]
-category = "main"
-description = "A Python application framework - Let us handle the boring stuff!"
 name = "pyapp"
+version = "4.3.0"
+description = "A Python application framework - Let us handle the boring stuff!"
+category = "main"
 optional = false
 python-versions = ">=3.6"
-version = "4.3.0"
 
 [package.dependencies]
 argcomplete = "*"
@@ -178,29 +175,30 @@ colorama = "*"
 yarl = "*"
 
 [package.extras]
-dev = ["nox", "docutils (0.15.2)"]
+dev = ["nox", "docutils (==0.15.2)"]
 yaml = ["pyyaml"]
 
 [[package]]
-category = "dev"
-description = "Python parsing module"
 name = "pyparsing"
+version = "2.4.7"
+description = "Python parsing module"
+category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "2.4.7"
 
 [[package]]
-category = "dev"
-description = "pytest: simple powerful testing with Python"
 name = "pytest"
+version = "6.0.1"
+description = "pytest: simple powerful testing with Python"
+category = "dev"
 optional = false
 python-versions = ">=3.5"
-version = "6.0.1"
 
 [package.dependencies]
-atomicwrites = ">=1.0"
+atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
 attrs = ">=17.4.0"
-colorama = "*"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 iniconfig = "*"
 more-itertools = ">=4.0.0"
 packaging = "*"
@@ -208,21 +206,17 @@ pluggy = ">=0.12,<1.0"
 py = ">=1.8.2"
 toml = "*"
 
-[package.dependencies.importlib-metadata]
-python = "<3.8"
-version = ">=0.12"
-
 [package.extras]
-checkqa_mypy = ["mypy (0.780)"]
+checkqa_mypy = ["mypy (==0.780)"]
 testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xmlschema"]
 
 [[package]]
-category = "dev"
-description = "Pytest support for asyncio."
 name = "pytest-asyncio"
+version = "0.14.0"
+description = "Pytest support for asyncio."
+category = "dev"
 optional = false
 python-versions = ">= 3.5"
-version = "0.14.0"
 
 [package.dependencies]
 pytest = ">=5.4.0"
@@ -231,64 +225,72 @@ pytest = ">=5.4.0"
 testing = ["async-generator (>=1.3)", "coverage", "hypothesis (>=5.7.1)"]
 
 [[package]]
-category = "dev"
-description = "Pytest plugin for measuring coverage."
 name = "pytest-cov"
+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.*"
-version = "2.10.1"
+python-versions = ">=3.6"
 
 [package.dependencies]
-coverage = ">=4.4"
+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]]
-category = "dev"
-description = "Python 2 and 3 compatibility utilities"
 name = "six"
+version = "1.15.0"
+description = "Python 2 and 3 compatibility utilities"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "1.15.0"
 
 [[package]]
-category = "dev"
-description = "Python Library for Tom's Obvious, Minimal Language"
 name = "toml"
+version = "0.10.1"
+description = "Python Library for Tom's Obvious, Minimal Language"
+category = "dev"
 optional = false
 python-versions = "*"
-version = "0.10.1"
 
 [[package]]
-category = "main"
-description = "Yet another URL library"
+name = "tomli"
+version = "1.2.1"
+description = "A lil' TOML parser"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
 name = "yarl"
+version = "1.4.2"
+description = "Yet another URL library"
+category = "main"
 optional = false
 python-versions = ">=3.5"
-version = "1.4.2"
 
 [package.dependencies]
 idna = ">=2.0"
 multidict = ">=4.0"
 
 [[package]]
-category = "main"
-description = "Backport of pathlib-compatible object wrapper for zip files"
-marker = "python_version < \"3.8\""
 name = "zipp"
+version = "3.1.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "main"
 optional = false
 python-versions = ">=3.6"
-version = "3.1.0"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["jaraco.itertools", "func-timeout"]
 
 [metadata]
-content-hash = "ee4a4edf2de1588c7a5d531756af034018a0092b853d198f9218999e935c72e7"
+lock-version = "1.1"
 python-versions = "^3.6"
+content-hash = "f68f6c486901e42b05e3aeeae8885899fdf89a6a07694e0f9f10a84e944b74bf"
 
 [metadata.files]
 argcomplete = [
@@ -312,37 +314,41 @@ colorama = [
     {file = "colorama-0.4.3.tar.gz", hash = "sha256:e96da0d330793e2cb9485e9ddfd918d456036c7149416295932478192f4436a1"},
 ]
 coverage = [
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+    {file = "coverage-6.0-cp38-cp38-win32.whl", hash = "sha256:11ce082eb0f7c2bbfe96f6c8bcc3a339daac57de4dc0f3186069ec5c58da911c"},
+    {file = "coverage-6.0-cp38-cp38-win_amd64.whl", hash = "sha256:7844a8c6a0fee401edbf578713c2473e020759267c40261b294036f9d3eb6a2d"},
+    {file = "coverage-6.0-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:bea681309bdd88dd1283a8ba834632c43da376d9bce05820826090aad80c0126"},
+    {file = "coverage-6.0-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:e735ab8547d8a1fe8e58dd765d6f27ac539b395f52160d767b7189f379f9be7a"},
+    {file = "coverage-6.0-cp39-cp39-manylinux_2_5_i686.manylinux1_i686.manylinux_2_12_i686.manylinux2010_i686.whl", hash = "sha256:7593a49300489d064ebb6c58539f52cbbc4a2e6a4385de5e92cae1563f88a425"},
+    {file = "coverage-6.0-cp39-cp39-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:adb0f4c3c8ba8104378518a1954cbf3d891a22c13fd0e0bf135391835f44f288"},
+    {file = "coverage-6.0-cp39-cp39-win32.whl", hash = "sha256:8da0c4a26a831b392deaba5fdd0cd7838d173b47ce2ec3d0f37be630cb09ef6e"},
+    {file = "coverage-6.0-cp39-cp39-win_amd64.whl", hash = "sha256:7af2f8e7bb54ace984de790e897f858e88068d8fbc46c9490b7c19c59cf51822"},
+    {file = "coverage-6.0-pp36-none-any.whl", hash = "sha256:82b58d37c47d93a171be9b5744bcc96a0012cbf53d5622b29a49e6be2097edd7"},
+    {file = "coverage-6.0-pp37-none-any.whl", hash = "sha256:fff04bfefb879edcf616f1ce5ea6f4a693b5976bdc5e163f8464f349c25b59f0"},
+    {file = "coverage-6.0.tar.gz", hash = "sha256:17983f6ccc47f4864fd16d20ff677782b23d1207bf222d10e4d676e4636b0872"},
 ]
 idna = [
     {file = "idna-2.9-py2.py3-none-any.whl", hash = "sha256:a068a21ceac8a4d63dbfd964670474107f541babbd2250d61922f029858365fa"},
@@ -411,8 +417,8 @@ pytest-asyncio = [
     {file = "pytest_asyncio-0.14.0-py3-none-any.whl", hash = "sha256:2eae1e34f6c68fc0a9dc12d4bea190483843ff4708d24277c41568d6b6044f1d"},
 ]
 pytest-cov = [
-    {file = "pytest-cov-2.10.1.tar.gz", hash = "sha256:47bd0ce14056fdd79f93e1713f88fad7bdcc583dcd7783da86ef2f085a0bb88e"},
-    {file = "pytest_cov-2.10.1-py2.py3-none-any.whl", hash = "sha256:45ec2d5182f89a81fc3eb29e3d1ed3113b9e9a873bcddb2a71faaab066110191"},
+    {file = "pytest-cov-3.0.0.tar.gz", hash = "sha256:e7f0f5b1617d2210a2cabc266dfe2f4c75a8d32fb89eafb7ad9d06f6d076d470"},
+    {file = "pytest_cov-3.0.0-py3-none-any.whl", hash = "sha256:578d5d15ac4a25e5f961c938b85a05b09fdaae9deef3bb6de9a6e766622ca7a6"},
 ]
 six = [
     {file = "six-1.15.0-py2.py3-none-any.whl", hash = "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"},
@@ -422,6 +428,10 @@ toml = [
     {file = "toml-0.10.1-py2.py3-none-any.whl", hash = "sha256:bda89d5935c2eac546d648028b9901107a595863cb36bae0c73ac804a9b4ce88"},
     {file = "toml-0.10.1.tar.gz", hash = "sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f"},
 ]
+tomli = [
+    {file = "tomli-1.2.1-py3-none-any.whl", hash = "sha256:8dd0e9524d6f386271a36b41dbf6c57d8e32fd96fd22b6584679dc569d20899f"},
+    {file = "tomli-1.2.1.tar.gz", hash = "sha256:a5b75cb6f3968abb47af1b40c1819dc519ea82bcc065776a866e8d74c5ca9442"},
+]
 yarl = [
     {file = "yarl-1.4.2-cp35-cp35m-macosx_10_13_x86_64.whl", hash = "sha256:3ce3d4f7c6b69c4e4f0704b32eca8123b9c58ae91af740481aa57d7857b5e41b"},
     {file = "yarl-1.4.2-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:a4844ebb2be14768f7994f2017f70aca39d658a96c786211be5ddbe1c68794c1"},
diff --git a/pyproject.toml b/pyproject.toml
index 4d49588..15e7c45 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ pyapp = "^4.3.0"
 asyncmock = "^0.4"
 pytest = "^6.0.1"
 pytest-asyncio = "^0.14.0"
-pytest-cov = "^2.10.1"
+pytest-cov = "^3.0.0"
 
 [tool.poetry.plugins."pyapp.extensions"]
 "pyapp-messaging.aio" = "pyapp_ext.messaging.aio:Extension"