diff --git a/poetry.lock b/poetry.lock
index eb627e4..4a510b5 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -30,7 +30,7 @@ tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>
 
 [[package]]
 name = "black"
-version = "21.5b1"
+version = "21.5b2"
 description = "The uncompromising code formatter."
 category = "main"
 optional = false
@@ -46,8 +46,9 @@ toml = ">=0.10.1"
 
 [package.extras]
 colorama = ["colorama (>=0.4.3)"]
-d = ["aiohttp (>=3.6.0)", "aiohttp-cors"]
+d = ["aiohttp (>=3.6.0)", "aiohttp-cors (>=0.4.0)"]
 python2 = ["typed-ast (>=1.4.2)"]
+uvloop = ["uvloop (>=0.15.2)"]
 
 [[package]]
 name = "click"
@@ -246,7 +247,7 @@ python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.9"
-content-hash = "f36dae83f4f5d75363e1cc01d41f009beb943c2a32c48dadeaa01d62d73270b3"
+content-hash = "d73f79743360a39ff9dabfa62370a84c39f45e7e388daac0ea90f1daca733e6f"
 
 [metadata.files]
 appdirs = [
@@ -262,8 +263,8 @@ attrs = [
     {file = "attrs-20.3.0.tar.gz", hash = "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"},
 ]
 black = [
-    {file = "black-21.5b1-py3-none-any.whl", hash = "sha256:8a60071a0043876a4ae96e6c69bd3a127dad2c1ca7c8083573eb82f92705d008"},
-    {file = "black-21.5b1.tar.gz", hash = "sha256:23695358dbcb3deafe7f0a3ad89feee5999a46be5fec21f4f1d108be0bcdb3b1"},
+    {file = "black-21.5b2-py3-none-any.whl", hash = "sha256:e5cf21ebdffc7a9b29d73912b6a6a9a4df4ce70220d523c21647da2eae0751ef"},
+    {file = "black-21.5b2.tar.gz", hash = "sha256:1fc0e0a2c8ae7d269dfcf0c60a89afa299664f3e811395d40b1922dff8f854b5"},
 ]
 click = [
     {file = "click-7.1.2-py2.py3-none-any.whl", hash = "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"},
diff --git a/pyproject.toml b/pyproject.toml
index cee14c2..69f944d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ python = "^3.9"
 invoke = "1.5.0"
 pytest = "6.2.4"
 
-black = { version = "^21.5b1", allow-prereleases = true }
+black = { version = "^21.5b2", allow-prereleases = true }
 codespell = ">=2.0.0"
 flake8 = "^3.9.2"
 pep8-naming = "^0.11.1"