diff --git a/poetry.lock b/poetry.lock
index cc6d079c..edce1a1b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -474,7 +474,7 @@ python-versions = ">=3.6"
 
 [[package]]
 name = "mypy"
-version = "0.812"
+version = "0.901"
 description = "Optional static typing for Python"
 category = "dev"
 optional = false
@@ -482,11 +482,12 @@ python-versions = ">=3.5"
 
 [package.dependencies]
 mypy-extensions = ">=0.4.3,<0.5.0"
-typed-ast = ">=1.4.0,<1.5.0"
+toml = "*"
 typing-extensions = ">=3.7.4"
 
 [package.extras]
 dmypy = ["psutil (>=4.0)"]
+python2 = ["typed-ast (>=1.4.0,<1.5.0)"]
 
 [[package]]
 name = "mypy-extensions"
@@ -815,14 +816,6 @@ category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
-[[package]]
-name = "typed-ast"
-version = "1.4.3"
-description = "a fork of Python 2 and 3 ast modules with type comment support"
-category = "dev"
-optional = false
-python-versions = "*"
-
 [[package]]
 name = "typing-extensions"
 version = "3.10.0.0"
@@ -908,7 +901,7 @@ multidict = ">=4.0"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "cce23a042fed3a7e9267895a0755df5a65f88f3ba6141c166bf032aed8814770"
+content-hash = "034528149b0dd6b727d09744d1c8f991a3222c93ab3a4a46b9cfe709e716cd96"
 
 [metadata.files]
 aiohttp = [
@@ -1222,28 +1215,29 @@ multidict = [
     {file = "multidict-5.1.0.tar.gz", hash = "sha256:25b4e5f22d3a37ddf3effc0710ba692cfc792c2b9edfb9c05aefe823256e84d5"},
 ]
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-    {file = "mypy-0.812-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:28fb5479c494b1bab244620685e2eb3c3f988d71fd5d64cc753195e8ed53df7c"},
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+    {file = "mypy-0.901-cp36-cp36m-manylinux2010_x86_64.whl", hash = "sha256:a85c6759dcc6a9884131fa06a037bd34352aa3947e7f5d9d5a35652cc3a44bcd"},
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+    {file = "mypy-0.901-cp38-cp38-manylinux2010_x86_64.whl", hash = "sha256:053b92ebae901fc7954677949049f70133f2f63e3e83dc100225c26d6a46fe95"},
+    {file = "mypy-0.901-cp38-cp38-win_amd64.whl", hash = "sha256:f208cc967e566698c4e30a1f65843fc88d8da05a8693bac8b975417e0aee9ced"},
+    {file = "mypy-0.901-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:c86e3f015bfe7958646825d41c0691c6e5a5cd4015e3409b5c29c18a3c712534"},
+    {file = "mypy-0.901-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:e8577d30daf1b7b6582020f539f76e78ee1ed64a0323b28c8e0333c45db9369f"},
+    {file = "mypy-0.901-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:5ddd8f4096d5fc2e7d7bb3924ac22758862163ad2c1cdc902c4b85568160e90a"},
+    {file = "mypy-0.901-cp39-cp39-manylinux2010_x86_64.whl", hash = "sha256:4b54518e399c3f4dc53380d4252c83276b2e60623cfc5274076eb8aae57572ac"},
+    {file = "mypy-0.901-cp39-cp39-win_amd64.whl", hash = "sha256:7845ad3a31407bfbd64c76d032c16ab546d282930f747023bf07c17b054bebc5"},
+    {file = "mypy-0.901-py3-none-any.whl", hash = "sha256:61b10ba18a01d05fc46adbf4f18b0e92178f6b5fd0f45926ffc2a408b5419728"},
+    {file = "mypy-0.901.tar.gz", hash = "sha256:18753a8bb9bcf031ff10009852bd48d781798ecbccf45be5449892e6af4e3f9f"},
 ]
 mypy-extensions = [
     {file = "mypy_extensions-0.4.3-py2.py3-none-any.whl", hash = "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d"},
@@ -1460,38 +1454,6 @@ toml = [
     {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
     {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
 ]
-typed-ast = [
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-    {file = "typed_ast-1.4.3-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:c907f561b1e83e93fad565bac5ba9c22d96a54e7ea0267c708bffe863cbe4075"},
-    {file = "typed_ast-1.4.3-cp35-cp35m-manylinux2014_aarch64.whl", hash = "sha256:1b3ead4a96c9101bef08f9f7d1217c096f31667617b58de957f690c92378b528"},
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-    {file = "typed_ast-1.4.3.tar.gz", hash = "sha256:fb1bbeac803adea29cedd70781399c99138358c26d05fcbd23c13016b7f5ec65"},
-]
 typing-extensions = [
     {file = "typing_extensions-3.10.0.0-py2-none-any.whl", hash = "sha256:0ac0f89795dd19de6b97debb0c6af1c70987fd80a2d62d1958f7e56fcc31b497"},
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diff --git a/pyproject.toml b/pyproject.toml
index 98017d05..9b051a62 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,7 +38,7 @@ coverage = {version = "^5.5", extras = ["toml"]}
 flake8 = "^3.8.4"
 flake8-docstrings = "^1.5.0"
 isort = "^5.7.0"
-mypy = "^0.812"
+mypy = "^0.901"
 pre-commit = "^2.11.1"
 pre-commit-hooks = "^4.0.1"
 pylint = "^2.7.2"