diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index e19bba2..56336f6 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8']
+        python-version: ['3.7', '3.8', '3.9']
         WITH_PANDAS: [false, true]
 
     steps:
diff --git a/requirements_dev.txt b/requirements_dev.txt
index 331b1d4..c06c498 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,14 +1,14 @@
-pip==22.3.1
+pip==23.0
 bumpversion==0.6.0
 wheel==0.38.4
-watchdog==2.1.9
+watchdog==2.3.0
 flake8==5.0.4
 tox==4.4.8
-coverage==6.5.0
-cryptography==38.0.2
+coverage==7.2.2
+cryptography==40.0.1
 Sphinx==5.3.0
 PyYAML==6.0
-pytest==7.1.3
+pytest==7.2.2
 pytest-runner==6.0.0
 vcrpy==2.1.1
 twine==4.0.2
diff --git a/tiingo/api.py b/tiingo/api.py
index 9bd90b2..11f647c 100644
--- a/tiingo/api.py
+++ b/tiingo/api.py
@@ -265,7 +265,6 @@ class TiingoClient(RestClient):
         frequency="daily",
         fmt="json",
     ):
-
         """Return a pandas.DataFrame of historical prices for one or more ticker symbols.
 
         By default, return latest EOD Composite Price for a list of stock tickers.
diff --git a/tiingo/wsclient.py b/tiingo/wsclient.py
index 63a7ff1..2f3ec6a 100644
--- a/tiingo/wsclient.py
+++ b/tiingo/wsclient.py
@@ -40,7 +40,6 @@ class TiingoWebsocketClient:
     """
 
     def __init__(self, config=None, endpoint=None, on_msg_cb=None):
-
         self._base_url = "wss://api.tiingo.com"
         self.config = {} if config is None else config