diff --git a/poetry.lock b/poetry.lock
index 86e238e..5c63aa0 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -77,19 +77,20 @@ python-versions = "*"
 
 [[package]]
 name = "mypy"
-version = "0.812"
+version = "0.920"
 description = "Optional static typing for Python"
 category = "dev"
 optional = false
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 
 [package.dependencies]
 mypy-extensions = ">=0.4.3,<0.5.0"
-typed-ast = ">=1.4.0,<1.5.0"
+tomli = ">=1.1.0,<3.0.0"
 typing-extensions = ">=3.7.4"
 
 [package.extras]
 dmypy = ["psutil (>=4.0)"]
+python2 = ["typed-ast (>=1.4.0,<2)"]
 
 [[package]]
 name = "mypy-extensions"
@@ -182,6 +183,14 @@ category = "dev"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
+[[package]]
+name = "tomli"
+version = "2.0.0"
+description = "A lil' TOML parser"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+
 [[package]]
 name = "typed-ast"
 version = "1.4.2"
@@ -201,7 +210,7 @@ python-versions = "*"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "3b2a549a1ff16d897031c06bd56b15524d4e8515bf0a3dc49222b92bf4be5ed7"
+content-hash = "a9a330a60ce138134eb41b0f79029e80a2df0ef58a37563850c5cdb53383c36b"
 
 [metadata.files]
 appdirs = [
@@ -232,28 +241,26 @@ iniconfig = [
     {file = "iniconfig-1.1.1.tar.gz", hash = "sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32"},
 ]
 mypy = [
-    {file = "mypy-0.812-cp35-cp35m-macosx_10_9_x86_64.whl", hash = "sha256:a26f8ec704e5a7423c8824d425086705e381b4f1dfdef6e3a1edab7ba174ec49"},
-    {file = "mypy-0.812-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:28fb5479c494b1bab244620685e2eb3c3f988d71fd5d64cc753195e8ed53df7c"},
-    {file = "mypy-0.812-cp35-cp35m-manylinux2010_x86_64.whl", hash = "sha256:9743c91088d396c1a5a3c9978354b61b0382b4e3c440ce83cf77994a43e8c521"},
-    {file = "mypy-0.812-cp35-cp35m-win_amd64.whl", hash = "sha256:d7da2e1d5f558c37d6e8c1246f1aec1e7349e4913d8fb3cb289a35de573fe2eb"},
-    {file = "mypy-0.812-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:4eec37370483331d13514c3f55f446fc5248d6373e7029a29ecb7b7494851e7a"},
-    {file = "mypy-0.812-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:d65cc1df038ef55a99e617431f0553cd77763869eebdf9042403e16089fe746c"},
-    {file = "mypy-0.812-cp36-cp36m-manylinux2010_x86_64.whl", hash = "sha256:61a3d5b97955422964be6b3baf05ff2ce7f26f52c85dd88db11d5e03e146a3a6"},
-    {file = "mypy-0.812-cp36-cp36m-win_amd64.whl", hash = "sha256:25adde9b862f8f9aac9d2d11971f226bd4c8fbaa89fb76bdadb267ef22d10064"},
-    {file = "mypy-0.812-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:552a815579aa1e995f39fd05dde6cd378e191b063f031f2acfe73ce9fb7f9e56"},
-    {file = "mypy-0.812-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:499c798053cdebcaa916eef8cd733e5584b5909f789de856b482cd7d069bdad8"},
-    {file = "mypy-0.812-cp37-cp37m-manylinux2010_x86_64.whl", hash = "sha256:5873888fff1c7cf5b71efbe80e0e73153fe9212fafdf8e44adfe4c20ec9f82d7"},
-    {file = "mypy-0.812-cp37-cp37m-win_amd64.whl", hash = "sha256:9f94aac67a2045ec719ffe6111df543bac7874cee01f41928f6969756e030564"},
-    {file = "mypy-0.812-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:d23e0ea196702d918b60c8288561e722bf437d82cb7ef2edcd98cfa38905d506"},
-    {file = "mypy-0.812-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:674e822aa665b9fd75130c6c5f5ed9564a38c6cea6a6432ce47eafb68ee578c5"},
-    {file = "mypy-0.812-cp38-cp38-manylinux2010_x86_64.whl", hash = "sha256:abf7e0c3cf117c44d9285cc6128856106183938c68fd4944763003decdcfeb66"},
-    {file = "mypy-0.812-cp38-cp38-win_amd64.whl", hash = "sha256:0d0a87c0e7e3a9becdfbe936c981d32e5ee0ccda3e0f07e1ef2c3d1a817cf73e"},
-    {file = "mypy-0.812-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:7ce3175801d0ae5fdfa79b4f0cfed08807af4d075b402b7e294e6aa72af9aa2a"},
-    {file = "mypy-0.812-cp39-cp39-manylinux1_x86_64.whl", hash = "sha256:b09669bcda124e83708f34a94606e01b614fa71931d356c1f1a5297ba11f110a"},
-    {file = "mypy-0.812-cp39-cp39-manylinux2010_x86_64.whl", hash = "sha256:33f159443db0829d16f0a8d83d94df3109bb6dd801975fe86bacb9bf71628e97"},
-    {file = "mypy-0.812-cp39-cp39-win_amd64.whl", hash = "sha256:3f2aca7f68580dc2508289c729bd49ee929a436208d2b2b6aab15745a70a57df"},
-    {file = "mypy-0.812-py3-none-any.whl", hash = "sha256:2f9b3407c58347a452fc0736861593e105139b905cca7d097e413453a1d650b4"},
-    {file = "mypy-0.812.tar.gz", hash = "sha256:cd07039aa5df222037005b08fbbfd69b3ab0b0bd7a07d7906de75ae52c4e3119"},
+    {file = "mypy-0.920-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:41f3575b20714171c832d8f6c7aaaa0d499c9a2d1b8adaaf837b4c9065c38540"},
+    {file = "mypy-0.920-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:431be889ffc8d9681813a45575c42e341c19467cbfa6dd09bf41467631feb530"},
+    {file = "mypy-0.920-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:f8b2059f73878e92eff7ed11a03515d6572f4338a882dd7547b5f7dd242118e6"},
+    {file = "mypy-0.920-cp310-cp310-win_amd64.whl", hash = "sha256:9cd316e9705555ca6a50670ba5fb0084d756d1d8cb1697c83820b1456b0bc5f3"},
+    {file = "mypy-0.920-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:e091fe58b4475b3504dc7c3022ff7f4af2f9e9ddf7182047111759ed0973bbde"},
+    {file = "mypy-0.920-cp36-cp36m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:98b4f91a75fed2e4c6339e9047aba95968d3a7c4b91e92ab9dc62c0c583564f4"},
+    {file = "mypy-0.920-cp36-cp36m-win_amd64.whl", hash = "sha256:562a0e335222d5bbf5162b554c3afe3745b495d67c7fe6f8b0d1b5bace0c1eeb"},
+    {file = "mypy-0.920-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:618e677aabd21f30670bffb39a885a967337f5b112c6fb7c79375e6dced605d6"},
+    {file = "mypy-0.920-cp37-cp37m-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:40cb062f1b7ff4cd6e897a89d8ddc48c6ad7f326b5277c93a8c559564cc1551c"},
+    {file = "mypy-0.920-cp37-cp37m-win_amd64.whl", hash = "sha256:69b5a835b12fdbfeed84ef31152d41343d32ccb2b345256d8682324409164330"},
+    {file = "mypy-0.920-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:993c2e52ea9570e6e872296c046c946377b9f5e89eeb7afea2a1524cf6e50b27"},
+    {file = "mypy-0.920-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:df0fec878ccfcb2d1d2306ba31aa757848f681e7bbed443318d9bbd4b0d0fe9a"},
+    {file = "mypy-0.920-cp38-cp38-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:331a81d2c9bf1be25317260a073b41f4584cd11701a7c14facef0aa5a005e843"},
+    {file = "mypy-0.920-cp38-cp38-win_amd64.whl", hash = "sha256:ffb1e57ec49a30e3c0ebcfdc910ae4aceb7afb649310b7355509df6b15bd75f6"},
+    {file = "mypy-0.920-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:31895b0b3060baf15bf76e789d94722c026f673b34b774bba9e8772295edccff"},
+    {file = "mypy-0.920-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:140174e872d20d4768124a089b9f9fc83abd6a349b7f8cc6276bc344eb598922"},
+    {file = "mypy-0.920-cp39-cp39-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:13b3c110309b53f5a62aa1b360f598124be33a42563b790a2a9efaacac99f1fc"},
+    {file = "mypy-0.920-cp39-cp39-win_amd64.whl", hash = "sha256:82e6c15675264e923b60a11d6eb8f90665504352e68edfbb4a79aac7a04caddd"},
+    {file = "mypy-0.920-py3-none-any.whl", hash = "sha256:71c77bd885d2ce44900731d4652d0d1c174dc66a0f11200e0c680bdedf1a6b37"},
+    {file = "mypy-0.920.tar.gz", hash = "sha256:a55438627f5f546192f13255a994d6d1cf2659df48adcf966132b4379fd9c86b"},
 ]
 mypy-extensions = [
     {file = "mypy_extensions-0.4.3-py2.py3-none-any.whl", hash = "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d"},
@@ -330,6 +337,10 @@ toml = [
     {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
     {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
 ]
+tomli = [
+    {file = "tomli-2.0.0-py3-none-any.whl", hash = "sha256:b5bde28da1fed24b9bd1d4d2b8cba62300bfb4ec9a6187a957e8ddb9434c5224"},
+    {file = "tomli-2.0.0.tar.gz", hash = "sha256:c292c34f58502a1eb2bbb9f5bbc9a5ebc37bee10ffb8c2d6bbdfa8eb13cc14e1"},
+]
 typed-ast = [
     {file = "typed_ast-1.4.2-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:7703620125e4fb79b64aa52427ec192822e9f45d37d4b6625ab37ef403e1df70"},
     {file = "typed_ast-1.4.2-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:c9aadc4924d4b5799112837b226160428524a9a45f830e0d0f184b19e4090487"},
diff --git a/pyproject.toml b/pyproject.toml
index 629ad3a..8e6c44e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ python = "^3.8"
 Click = "^7.0"
 
 [tool.poetry.dev-dependencies]
-mypy = "^0.812"
+mypy = "^0.920"
 black = "^20.8b0"
 pytest = "^6.2.2"