diff --git a/aioaws/sns.py b/aioaws/sns.py
index 5ceb388..cc018d4 100644
--- a/aioaws/sns.py
+++ b/aioaws/sns.py
@@ -60,7 +60,7 @@ async def verify_webhook(request_body: Union[str, bytes], http_client: AsyncClie
 
 async def verify_signature(payload: SnsPayload, http_client: AsyncClient) -> None:
     url = payload.signing_cert_url
-    if not re.fullmatch(r'sns\.[a-z0-9\-]+\.amazonaws\.com', url.host):
+    if url.host is None or not re.fullmatch(r'sns\.[a-z0-9\-]+\.amazonaws\.com', url.host):
         raise SnsWebhookError(f'invalid SigningCertURL "{url}"')
 
     certs_content = await get_resources(url, http_client)
diff --git a/requirements.txt b/requirements.txt
index 27879d4..629c3c3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 # this exists mostly to prompt dependabot to update critical depend
 -r tests/requirements.txt
-aiofiles==0.7.0
-cryptography==3.4.8
-httpx==0.19.0
-pydantic==1.8.2
+aiofiles==0.8.0
+cryptography==36.0.1
+httpx==0.21.3
+pydantic==1.9.0
diff --git a/setup.cfg b/setup.cfg
index f93290f..f824c0f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,12 +1,7 @@
 [tool:pytest]
 testpaths = tests
-filterwarnings =
-    error
-    ignore::DeprecationWarning:aiohttp.web_server
-    ignore::DeprecationWarning:aiohttp.web_runner
-    ignore::DeprecationWarning:asyncio.base_events
-    ignore::DeprecationWarning:aiohttp.helpers
-    ignore::DeprecationWarning:aiofiles.os
+asyncio_mode = auto
+filterwarnings = error
 
 [flake8]
 max-line-length = 120
diff --git a/setup.py b/setup.py
index 50a4273..e19ac49 100644
--- a/setup.py
+++ b/setup.py
@@ -51,7 +51,7 @@
     install_requires=[
         'aiofiles>=0.5.0',
         'cryptography>=3.1.1',
-        'httpx>=0.18.2',
-        'pydantic>=1.7.4',
+        'httpx>=0.21.0',
+        'pydantic>=1.8.2',
     ],
 )
diff --git a/tests/requirements-linting.txt b/tests/requirements-linting.txt
index 2c99e16..be739a8 100644
--- a/tests/requirements-linting.txt
+++ b/tests/requirements-linting.txt
@@ -1,7 +1,7 @@
 black==20.8b1
-flake8==3.9.2
-flake8-quotes==3.3.0
-isort==5.9.3
-mypy==0.910
-pycodestyle==2.7.0
-pyflakes==2.3.1
+flake8==4.0.1
+flake8-quotes==3.3.1
+isort==5.10.1
+mypy==0.931
+pycodestyle==2.8.0
+pyflakes==2.4.0
diff --git a/tests/requirements.txt b/tests/requirements.txt
index e03c740..2111ca2 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,11 +1,11 @@
 aiohttp==3.7.4
-foxglove-web==0.0.28
-pillow==8.3.2
-coverage==5.5
-pygments==2.10.0
-pytest==6.2.4
-pytest-cov==2.12.1
-pytest-asyncio==0.15.1
+foxglove-web==0.0.36
+pillow==9.0.0
+coverage==6.2
+pygments==2.11.2
+pytest==6.2.5
+pytest-cov==3.0.0
+pytest-asyncio==0.17.2
 pytest-mock==3.6.1
 pytest-sugar==0.9.4
 pytest-toolbox==0.4