diff --git a/poetry.lock b/poetry.lock
index 4cf24e0..dc0fd6c 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -648,19 +648,22 @@ description = "pytest: simple powerful testing with Python"
 name = "pytest"
 optional = false
 python-versions = ">=3.5"
-version = "5.0.1"
+version = "5.1.0"
 
 [package.dependencies]
 atomicwrites = ">=1.0"
 attrs = ">=17.4.0"
 colorama = "*"
-importlib-metadata = ">=0.12"
 more-itertools = ">=4.0.0"
 packaging = "*"
 pluggy = ">=0.12,<1.0"
 py = ">=1.5.0"
 wcwidth = "*"
 
+[package.dependencies.importlib-metadata]
+python = "<3.8"
+version = ">=0.12"
+
 [[package]]
 category = "dev"
 description = "Pytest plugin for measuring coverage."
@@ -987,7 +990,7 @@ python-versions = ">=2.7"
 version = "0.5.1"
 
 [metadata]
-content-hash = "4bd10a199590b6d36b787d0ab5a5aec19ed9219954e71d24bc0adff73ae64784"
+content-hash = "94b2c22a0f810b09ec69bfe0d5e3439cdbacdb4039a81c8b8f7bc466236de1e0"
 python-versions = "^3.6 || ^3.7"
 
 [metadata.hashes]
@@ -1054,7 +1057,7 @@ pydocstyle = ["2258f9b0df68b97bf3a6c29003edc5238ff8879f1efb6f1999988d934e432bd8"
 pyflakes = ["9a7662ec724d0120012f6e29d6248ae3727d821bba522a0e6b356eff19126a49", "f661252913bc1dbe7fcfcbf0af0db3f42ab65aabd1a6ca68fe5d466bace94dae"]
 pygments = ["31cba6ffb739f099a85e243eff8cb717089fdd3c7300767d9fc34cb8e1b065f5", "5ad302949b3c98dd73f8d9fcdc7e9cb592f120e32a18e23efd7f3dc51194472b"]
 pyparsing = ["1873c03321fc118f4e9746baf201ff990ceb915f433f23b395f5580d1840cb2a", "9b6323ef4ab914af344ba97510e966d64ba91055d6b9afa6b30799340e89cc03"]
-pytest = ["6ef6d06de77ce2961156013e9dff62f1b2688aa04d0dc244299fe7d67e09370d", "a736fed91c12681a7b34617c8fcefe39ea04599ca72c608751c31d89579a3f77"]
+pytest = ["3805d095f1ea279b9870c3eeae5dddf8a81b10952c8835cd628cf1875b0ef031", "abc562321c2d190dd63c2faadf70b86b7af21a553b61f0df5f5e1270717dc5a3"]
 pytest-cov = ["2b097cde81a302e1047331b48cadacf23577e431b61e9c6f49a1170bbe3d3da6", "e00ea4fdde970725482f1f35630d12f074e121a23801aabf2ae154ec6bdd343a"]
 pytest-flake8 = ["4d225c13e787471502ff94409dcf6f7927049b2ec251c63b764a4b17447b60c0", "d7e2b6b274a255b7ae35e9224c85294b471a83b76ecb6bd53c337ae977a499af"]
 pytest-randomly = ["07b642e177c5921386fa36ee3995a4bda918a1d20b3806a4f397a02788f88331", "f5ac7c6e30a32c1aa5ae911e00b5ffd6a0df38eb818f6b539e1e7b89995724ed"]
diff --git a/pyproject.toml b/pyproject.toml
index 8e26dbc..e96359a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ dataclasses = { version = "^0.6", python = "<3.7" }
 typing_extensions = "^3.6"
 
 [tool.poetry.dev-dependencies]
-pytest = "^5.0"
+pytest = "^5.1"
 pytest-cov = "^2.7"
 pytest-randomly = "^3.0"
 pytest-flake8 = "^1.0"