diff --git a/poetry.lock b/poetry.lock
index 61e1447..13025c3 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -184,15 +184,19 @@ testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtuale
 
 [[package]]
 name = "pytest-mypy"
-version = "0.7.0"
+version = "0.8.1"
 description = "Mypy static type checker plugin for Pytest"
 category = "dev"
 optional = false
 python-versions = ">=3.5"
 
 [package.dependencies]
+attrs = ">=19.0"
 filelock = ">=3.0"
-mypy = {version = ">=0.700", markers = "python_version >= \"3.8\""}
+mypy = [
+    {version = ">=0.700", markers = "python_version >= \"3.8\" and python_version < \"3.9\""},
+    {version = ">=0.780", markers = "python_version >= \"3.9\""},
+]
 pytest = ">=3.5"
 
 [[package]]
@@ -285,7 +289,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "a9e780692115af4268bd9ded797053cb9e2fb3f356ec51378ee57f4eb6da8ef3"
+content-hash = "8821b159933224b083b956f108f6b5c03582b52b7e0c63014098c5e7a7e73f1f"
 
 [metadata.files]
 atomicwrites = [
@@ -401,8 +405,8 @@ pytest-cov = [
     {file = "pytest_cov-2.12.1-py2.py3-none-any.whl", hash = "sha256:261bb9e47e65bd099c89c3edf92972865210c36813f80ede5277dceb77a4a62a"},
 ]
 pytest-mypy = [
-    {file = "pytest-mypy-0.7.0.tar.gz", hash = "sha256:5a667d9a2b66bf98b3a494411f221923a6e2c3eafbe771104951aaec8985673d"},
-    {file = "pytest_mypy-0.7.0-py3-none-any.whl", hash = "sha256:e0505ace48d2b19fe686366fce6b4a2ac0d090423736bb6aa2e39554d18974b7"},
+    {file = "pytest-mypy-0.8.1.tar.gz", hash = "sha256:1fa55723a4bf1d054fcba1c3bd694215a2a65cc95ab10164f5808afd893f3b11"},
+    {file = "pytest_mypy-0.8.1-py3-none-any.whl", hash = "sha256:6e68e8eb7ceeb7d1c83a1590912f784879f037b51adfb9c17b95c6b2fc57466b"},
 ]
 requests = [
     {file = "requests-2.26.0-py2.py3-none-any.whl", hash = "sha256:6c1246513ecd5ecd4528a0906f910e8f0f9c6b8ec72030dc9fd154dc1a6efd24"},
diff --git a/pyproject.toml b/pyproject.toml
index ded37f9..71c8934 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ xmltodict = "^0.12.0"
 requests-mock = "^1.9.3"
 pytest = "^6.2.4"
 pytest-cov = "^2.12.1"
-pytest-mypy = "^0.7.0"
+pytest-mypy = "^0.8.1"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]