diff --git a/poetry.lock b/poetry.lock
index d25f2ce..31a1687 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -30,25 +30,24 @@ tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>
 
 [[package]]
 name = "black"
-version = "20.8b1"
+version = "21.5b1"
 description = "The uncompromising code formatter."
 category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=3.6.2"
 
 [package.dependencies]
 appdirs = "*"
 click = ">=7.1.2"
 mypy-extensions = ">=0.4.3"
-pathspec = ">=0.6,<1"
+pathspec = ">=0.8.1,<1"
 regex = ">=2020.1.8"
 toml = ">=0.10.1"
-typed-ast = ">=1.4.0"
-typing-extensions = ">=3.7.4"
 
 [package.extras]
 colorama = ["colorama (>=0.4.3)"]
-d = ["aiohttp (>=3.3.2)", "aiohttp-cors"]
+d = ["aiohttp (>=3.6.0)", "aiohttp-cors"]
+python2 = ["typed-ast (>=1.4.2)"]
 
 [[package]]
 name = "cachetools"
@@ -591,7 +590,7 @@ dev = ["pytest (>=4.6.2)", "black (>=19.3b0)"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "ec7997a5afafc42b7b1c2f16acb987f05bb0e926e90c38ef5faf6ac3dcb7570a"
+content-hash = "3b9dd157e59224de8a435e090edc45a64bba8694f66510bd2dcd3cead33e3789"
 
 [metadata.files]
 appdirs = [
@@ -607,7 +606,8 @@ attrs = [
     {file = "attrs-20.3.0.tar.gz", hash = "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"},
 ]
 black = [
-    {file = "black-20.8b1.tar.gz", hash = "sha256:1c02557aa099101b9d21496f8a914e9ed2222ef70336404eeeac8edba836fbea"},
+    {file = "black-21.5b1-py3-none-any.whl", hash = "sha256:8a60071a0043876a4ae96e6c69bd3a127dad2c1ca7c8083573eb82f92705d008"},
+    {file = "black-21.5b1.tar.gz", hash = "sha256:23695358dbcb3deafe7f0a3ad89feee5999a46be5fec21f4f1d108be0bcdb3b1"},
 ]
 cachetools = [
     {file = "cachetools-4.2.1-py3-none-any.whl", hash = "sha256:1d9d5f567be80f7c07d765e21b814326d78c61eb0c3a637dffc0e5d1796cb2e2"},
diff --git a/pyproject.toml b/pyproject.toml
index 37bb561..ce8ae8b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ python-dotenv = "*"
 [tool.poetry.dev-dependencies]
 pytest = "*"
 mypy = "*"
-black = "^20.8b1"
+black = "^21.5b1"
 isort = "^5.6.4"
 flake8 = "^3.8.4"