diff --git a/poetry.lock b/poetry.lock
index 8a21425..c8fcf41 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -105,7 +105,7 @@ pyflakes = ">=2.4.0,<2.5.0"
 
 [[package]]
 name = "identify"
-version = "2.4.5"
+version = "2.4.6"
 description = "File identification library for Python"
 category = "dev"
 optional = true
@@ -304,14 +304,11 @@ diagrams = ["jinja2", "railroad-diagrams"]
 
 [[package]]
 name = "pyrsistent"
-version = "0.16.1"
+version = "0.18.1"
 description = "Persistent/Functional/Immutable data structures"
 category = "main"
 optional = false
-python-versions = ">=2.7"
-
-[package.dependencies]
-six = "*"
+python-versions = ">=3.7"
 
 [[package]]
 name = "pytest"
@@ -392,7 +389,7 @@ use_chardet_on_py3 = ["chardet (>=3.0.2,<5)"]
 name = "six"
 version = "1.16.0"
 description = "Python 2 and 3 compatibility utilities"
-category = "main"
+category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 
@@ -494,7 +491,7 @@ requests = ["requests"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7.0"
-content-hash = "134e2e38a04f952985a854bd4ffd3ece7f144c2cbf1b8fa58d4370b4711ebeb8"
+content-hash = "ed884279ad4d7b9f92b5cd523157c095c8f9fe9365e711b86ed14e31b6bc664c"
 
 [metadata.files]
 atomicwrites = [
@@ -580,8 +577,8 @@ flake8 = [
     {file = "flake8-4.0.1.tar.gz", hash = "sha256:806e034dda44114815e23c16ef92f95c91e4c71100ff52813adf7132a6ad870d"},
 ]
 identify = [
-    {file = "identify-2.4.5-py2.py3-none-any.whl", hash = "sha256:d27d10099844741c277b45d809bd452db0d70a9b41ea3cd93799ebbbcc6dcb29"},
-    {file = "identify-2.4.5.tar.gz", hash = "sha256:d11469ff952a4d7fd7f9be520d335dc450f585d474b39b5dfb86a500831ab6c7"},
+    {file = "identify-2.4.6-py2.py3-none-any.whl", hash = "sha256:cf06b1639e0dca0c184b1504d8b73448c99a68e004a80524c7923b95f7b6837c"},
+    {file = "identify-2.4.6.tar.gz", hash = "sha256:233679e3f61a02015d4293dbccf16aa0e4996f868bd114688b8c124f18826706"},
 ]
 idna = [
     {file = "idna-3.3-py3-none-any.whl", hash = "sha256:84d9dd047ffa80596e0f246e2eab0b391788b0503584e8945f2368256d2735ff"},
@@ -648,7 +645,27 @@ pyparsing = [
     {file = "pyparsing-3.0.7.tar.gz", hash = "sha256:18ee9022775d270c55187733956460083db60b37d0d0fb357445f3094eed3eea"},
 ]
 pyrsistent = [
-    {file = "pyrsistent-0.16.1.tar.gz", hash = "sha256:aa2ae1c2e496f4d6777f869ea5de7166a8ccb9c2e06ebcf6c7ff1b670c98c5ef"},
+    {file = "pyrsistent-0.18.1-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:df46c854f490f81210870e509818b729db4488e1f30f2a1ce1698b2295a878d1"},
+    {file = "pyrsistent-0.18.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:5d45866ececf4a5fff8742c25722da6d4c9e180daa7b405dc0a2a2790d668c26"},
+    {file = "pyrsistent-0.18.1-cp310-cp310-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:4ed6784ceac462a7d6fcb7e9b663e93b9a6fb373b7f43594f9ff68875788e01e"},
+    {file = "pyrsistent-0.18.1-cp310-cp310-win32.whl", hash = "sha256:e4f3149fd5eb9b285d6bfb54d2e5173f6a116fe19172686797c056672689daf6"},
+    {file = "pyrsistent-0.18.1-cp310-cp310-win_amd64.whl", hash = "sha256:636ce2dc235046ccd3d8c56a7ad54e99d5c1cd0ef07d9ae847306c91d11b5fec"},
+    {file = "pyrsistent-0.18.1-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:e92a52c166426efbe0d1ec1332ee9119b6d32fc1f0bbfd55d5c1088070e7fc1b"},
+    {file = "pyrsistent-0.18.1-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:d7a096646eab884bf8bed965bad63ea327e0d0c38989fc83c5ea7b8a87037bfc"},
+    {file = "pyrsistent-0.18.1-cp37-cp37m-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:cdfd2c361b8a8e5d9499b9082b501c452ade8bbf42aef97ea04854f4a3f43b22"},
+    {file = "pyrsistent-0.18.1-cp37-cp37m-win32.whl", hash = "sha256:7ec335fc998faa4febe75cc5268a9eac0478b3f681602c1f27befaf2a1abe1d8"},
+    {file = "pyrsistent-0.18.1-cp37-cp37m-win_amd64.whl", hash = "sha256:6455fc599df93d1f60e1c5c4fe471499f08d190d57eca040c0ea182301321286"},
+    {file = "pyrsistent-0.18.1-cp38-cp38-macosx_10_9_universal2.whl", hash = "sha256:fd8da6d0124efa2f67d86fa70c851022f87c98e205f0594e1fae044e7119a5a6"},
+    {file = "pyrsistent-0.18.1-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:7bfe2388663fd18bd8ce7db2c91c7400bf3e1a9e8bd7d63bf7e77d39051b85ec"},
+    {file = "pyrsistent-0.18.1-cp38-cp38-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:0e3e1fcc45199df76053026a51cc59ab2ea3fc7c094c6627e93b7b44cdae2c8c"},
+    {file = "pyrsistent-0.18.1-cp38-cp38-win32.whl", hash = "sha256:b568f35ad53a7b07ed9b1b2bae09eb15cdd671a5ba5d2c66caee40dbf91c68ca"},
+    {file = "pyrsistent-0.18.1-cp38-cp38-win_amd64.whl", hash = "sha256:d1b96547410f76078eaf66d282ddca2e4baae8964364abb4f4dcdde855cd123a"},
+    {file = "pyrsistent-0.18.1-cp39-cp39-macosx_10_9_universal2.whl", hash = "sha256:f87cc2863ef33c709e237d4b5f4502a62a00fab450c9e020892e8e2ede5847f5"},
+    {file = "pyrsistent-0.18.1-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:6bc66318fb7ee012071b2792024564973ecc80e9522842eb4e17743604b5e045"},
+    {file = "pyrsistent-0.18.1-cp39-cp39-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:914474c9f1d93080338ace89cb2acee74f4f666fb0424896fcfb8d86058bf17c"},
+    {file = "pyrsistent-0.18.1-cp39-cp39-win32.whl", hash = "sha256:1b34eedd6812bf4d33814fca1b66005805d3640ce53140ab8bbb1e2651b0d9bc"},
+    {file = "pyrsistent-0.18.1-cp39-cp39-win_amd64.whl", hash = "sha256:e24a828f57e0c337c8d8bb9f6b12f09dfdf0273da25fda9e314f0b684b415a07"},
+    {file = "pyrsistent-0.18.1.tar.gz", hash = "sha256:d4d61f8b993a7255ba714df3aca52700f8125289f84f704cf80916517c46eb96"},
 ]
 pytest = [
     {file = "pytest-6.2.5-py3-none-any.whl", hash = "sha256:7310f8d27bc79ced999e760ca304d69f6ba6c6649c0b60fb0e04a4a77cacc134"},
diff --git a/pyproject.toml b/pyproject.toml
index 46fffb4..67b4d6d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,6 @@ classifiers = [
 [tool.poetry.dependencies]
 jsonschema = ">=3.2.0, <5.0.0"
 openapi-schema-validator = "^0.2.0"
-pyrsistent = "<0.17.0"
 python = "^3.7.0"
 PyYAML = ">=5.1"
 requests = {version = "*", optional = true}