diff --git a/poetry.lock b/poetry.lock
index ebf1c65..e4be018 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 2.2.1 and should not be changed by hand.
+# This file is automatically @generated by Poetry 2.4.1 and should not be changed by hand.
 
 [[package]]
 name = "annotated-types"
@@ -874,21 +874,21 @@ windows-terminal = ["colorama (>=0.4.6)"]
 
 [[package]]
 name = "pytest"
-version = "8.4.2"
+version = "9.1.1"
 description = "pytest: simple powerful testing with Python"
 optional = false
-python-versions = ">=3.9"
+python-versions = ">=3.10"
 groups = ["dev"]
 files = [
-    {file = "pytest-8.4.2-py3-none-any.whl", hash = "sha256:872f880de3fc3a5bdc88a11b39c9710c3497a547cfa9320bc3c5e62fbf272e79"},
-    {file = "pytest-8.4.2.tar.gz", hash = "sha256:86c0d0b93306b961d58d62a4db4879f27fe25513d4b969df351abdddb3c30e01"},
+    {file = "pytest-9.1.1-py3-none-any.whl", hash = "sha256:37a86b45efb9a47a61a36449063e8e18d0cab3161329fc099eb21783169c4f0c"},
+    {file = "pytest-9.1.1.tar.gz", hash = "sha256:1088fbde8f2b49d95a549a195707afa7a76a3ce9bcadc26b6d71f0ffda5fe313"},
 ]
 
 [package.dependencies]
 colorama = {version = ">=0.4", markers = "sys_platform == \"win32\""}
 exceptiongroup = {version = ">=1", markers = "python_version < \"3.11\""}
-iniconfig = ">=1"
-packaging = ">=20"
+iniconfig = ">=1.0.1"
+packaging = ">=22"
 pluggy = ">=1.5,<2"
 pygments = ">=2.7.2"
 tomli = {version = ">=1", markers = "python_version < \"3.11\""}
@@ -1221,4 +1221,4 @@ typing-extensions = {version = ">=4.13.2", markers = "python_version < \"3.11\""
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.10,<4.0"
-content-hash = "6ea13441149f4d993c1050a3afbce43e361e74deeb09282815f13f800f40c31b"
+content-hash = "4b6a6ba6255c9d299c674e4664cbcd5a4aed1f95fda94a94940141cce3a7502b"
diff --git a/pyproject.toml b/pyproject.toml
index 5bb38ee..b9548b4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,7 +40,7 @@ Issues = "https://github.com/ActiveCampaign/postmark-python/issues"
 packages = [{ include = "postmark" }]
 
 [tool.poetry.group.dev.dependencies]
-pytest = "^8.1.1"             # Testing framework
+pytest = "^9.1.1"             # Testing framework
 pytest-asyncio = "^1.0.0"     # To run async tests with pytest
 respx = "^0.21.0"             # Mocking HTTP requests for testing
 pytest-cov = "^7.0.0"         # For coverage reports