diff --git a/comet_core/api.py b/comet_core/api.py
index 1795937..8ceb85f 100644
--- a/comet_core/api.py
+++ b/comet_core/api.py
@@ -107,7 +107,7 @@ def create_app(self):
         app.register_blueprint(api_v0.bp)
 
         @app.route("/")
-        def health_check():  # pylint: disable=unused-variable
+        def health_check():
             """Can be called by e.g. Kubernetes to verify that the API is up
 
             Returns:
diff --git a/comet_core/api_helper.py b/comet_core/api_helper.py
index 12dad7f..c560df3 100644
--- a/comet_core/api_helper.py
+++ b/comet_core/api_helper.py
@@ -48,7 +48,7 @@ def get_db():
         DataStore: a request-scoped datastore instance
     """
     if "db" not in g:
-        g.db = DataStore(current_app.config.get("database_uri"))
+        g.db = DataStore(current_app.config.get("database_uri")) # pylint: disable=assigning-non-slot
     return g.db
 
 
@@ -60,12 +60,12 @@ def requires_auth(f):
     # pylint: disable=missing-return-doc,missing-return-type-doc
     def decorated(*args, **kwargs):
         auth_func = current_app.config.get("auth_func")
-        g.authorized_for = []
+        g.authorized_for = [] # pylint: disable=assigning-non-slot
         if auth_func:
             res = auth_func()
             if isinstance(res, Response):
                 return res
-            g.authorized_for = res
+            g.authorized_for = res # pylint: disable=assigning-non-slot
             return f(*args, **kwargs)
         LOG.warning("no auth function specified")
         return f(*args, **kwargs)
diff --git a/comet_core/app.py b/comet_core/app.py
index b693dab..d45119b 100644
--- a/comet_core/app.py
+++ b/comet_core/app.py
@@ -466,7 +466,7 @@ def process_unprocessed_events(self):
 
                 events_to_remind = []
                 if source_type_config["communication_digest_mode"]:
-                    if any([event.new for event in events]) or self.data_store.check_any_issue_needs_reminder(
+                    if any(event.new for event in events) or self.data_store.check_any_issue_needs_reminder(
                         owner_reminder_cadence, events
                     ):
                         events_to_remind = events
diff --git a/comet_core/data_store.py b/comet_core/data_store.py
index f87b8e1..4c57535 100644
--- a/comet_core/data_store.py
+++ b/comet_core/data_store.py
@@ -14,9 +14,6 @@
 
 """Data Store module - interface to database."""
 
-# pylint: disable=no-member
-# See: https://github.com/PyCQA/pylint/issues/3610
-
 from datetime import datetime, timedelta
 
 from sqlalchemy import create_engine
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 3936990..089269a 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,6 +1,6 @@
-black==20.8b1
-pytest==6.0.1
-pytest-cov==2.10.1
+black==21.5b2
+pytest==6.2.4
+pytest-cov==2.12.0
 pytest-freezegun==0.4.2
-tox==3.20.0
-pylint==2.6.0
+tox==3.23.1
+pylint==2.8.3
diff --git a/setup.py b/setup.py
index 04533de..5a1ff37 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,7 @@
 
 setuptools.setup(
     name="comet-core",
-    version="2.8.2",
+    version="2.9.0",
     url="https://github.com/spotify/comet-core",
     author="Spotify Platform Security",
     author_email="wasabi@spotify.com",
@@ -24,7 +24,7 @@
     long_description=open("README.md", "r+", encoding="utf-8").read(),
     long_description_content_type="text/markdown",
     packages=["comet_core"],
-    install_requires=["Flask~=1.1", "Flask-Cors~=3.0", "python-json-logger~=0.1", "SQLAlchemy~=1.3"],
+    install_requires=["Flask~=2.0", "Flask-Cors~=3.0", "python-json-logger~=2.0", "SQLAlchemy~=1.4"],
     include_package_data=True,
     classifiers=[
         "Development Status :: 5 - Production/Stable",