diff --git a/flask_ask/convert.py b/flask_ask/convert.py
index fcc6a8a..44cbeca 100644
--- a/flask_ask/convert.py
+++ b/flask_ask/convert.py
@@ -8,15 +8,15 @@
 
 _DATE_PATTERNS = {
     # "today", "tomorrow", "november twenty-fifth": 2015-11-25
-    '^\d{4}-\d{2}-\d{2}$': '%Y-%m-%d',
+    r'^\d{4}-\d{2}-\d{2}$': '%Y-%m-%d',
     # "this week", "next week": 2015-W48
-    '^\d{4}-W\d{2}$': '%Y-W%U-%w',
+    r'^\d{4}-W\d{2}$': '%Y-W%U-%w',
     # "this weekend": 2015-W48-WE
-    '^\d{4}-W\d{2}-WE$': '%Y-W%U-WE-%w',
+    r'^\d{4}-W\d{2}-WE$': '%Y-W%U-WE-%w',
     # "this month": 2015-11
-    '^\d{4}-\d{2}$': '%Y-%m',
+    r'^\d{4}-\d{2}$': '%Y-%m',
     # "next year": 2016
-    '^\d{4}$': '%Y',
+    r'^\d{4}$': '%Y',
 }
 
 
diff --git a/flask_ask/core.py b/flask_ask/core.py
index 6ebffdb..125ca2c 100644
--- a/flask_ask/core.py
+++ b/flask_ask/core.py
@@ -3,14 +3,14 @@
 import yaml
 import inspect
 import io
-from datetime import datetime
+from datetime import datetime, timezone
 from functools import wraps, partial
 
 import aniso8601
-from werkzeug.contrib.cache import SimpleCache
+from cachelib import SimpleCache
 from werkzeug.local import LocalProxy, LocalStack
 from jinja2 import BaseLoader, ChoiceLoader, TemplateNotFound
-from flask import current_app, json, request as flask_request, _app_ctx_stack
+from flask import current_app, json, request as flask_request, g
 
 from . import verifier, logger
 from .convert import to_date, to_time, to_timedelta
@@ -524,47 +524,46 @@ def wrapper(*args, **kwargs):
 
     @property
     def request(self):
-        return getattr(_app_ctx_stack.top, '_ask_request', None)
+        return g.get('_ask_request')
 
     @request.setter
     def request(self, value):
-        _app_ctx_stack.top._ask_request = value
+        g._ask_request = value
 
     @property
     def session(self):
-        return getattr(_app_ctx_stack.top, '_ask_session', models._Field())
+        return g.get('_ask_session', models._Field())
 
     @session.setter
     def session(self, value):
-        _app_ctx_stack.top._ask_session = value
+        g._ask_session = value
 
     @property
     def version(self):
-        return getattr(_app_ctx_stack.top, '_ask_version', None)
+        return g.get('_ask_version')
 
     @version.setter
     def version(self, value):
-        _app_ctx_stack.top._ask_version = value
+        g._ask_version = value
 
     @property
     def context(self):
-        return getattr(_app_ctx_stack.top, '_ask_context', None)
+        return g.get('_ask_context')
 
     @context.setter
     def context(self, value):
-        _app_ctx_stack.top._ask_context = value
+        g._ask_context = value
 
     @property
     def convert_errors(self):
-        return getattr(_app_ctx_stack.top, '_ask_convert_errors', None)
+        return g.get('_ask_convert_errors')
 
     @convert_errors.setter
     def convert_errors(self, value):
-        _app_ctx_stack.top._ask_convert_errors = value
+        g._ask_convert_errors = value
 
     @property
     def current_stream(self):
-        #return getattr(_app_ctx_stack.top, '_ask_current_stream', models._Field())
         user = self._get_user()
         if user:
             stream = top_stream(self.stream_cache, user)
@@ -732,10 +731,10 @@ def _parse_timestamp(timestamp):
                 # raised by aniso8601 if raw_timestamp is not valid string
                 # in ISO8601 format
                 try:
-                    return datetime.utcfromtimestamp(timestamp)
+                    return datetime.fromtimestamp(timestamp, timezone.utc).replace(tzinfo=None)
                 except:
                     # relax the timestamp a bit in case it was sent in millis
-                    return datetime.utcfromtimestamp(timestamp/1000)
+                    return datetime.fromtimestamp(timestamp/1000, timezone.utc).replace(tzinfo=None)
 
         raise ValueError('Invalid timestamp value! Cannot parse from either ISO8601 string or UTC timestamp.')
 
diff --git a/requirements-dev.txt b/requirements-dev.txt
index f8d2793..3c6e611 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,6 @@
 -r requirements.txt
-mock==2.0.0
-requests==2.13.0
-tox==2.7.0
+mock==5.1.0
+requests==2.32.3
+tox==4.23.2
+urllib3==2.2.3
 
diff --git a/requirements.txt b/requirements.txt
index f6e850d..932d4ec 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,9 @@
-aniso8601==1.2.0
-Flask==1.1.1
-cryptography==2.1.4
-pyOpenSSL==17.0.0
-PyYAML==5.4
-six==1.11.0
-Werkzeug==0.16.1
+aniso8601==1.3.0
+Flask==3.1.0
+cryptography==43.0.3
+pyOpenSSL==24.2.1
+PyYAML==6.0.2
+six==1.16.0
+Werkzeug==3.1.3
+markupsafe==3.0.2
+cachelib==0.13.0
diff --git a/tests/test_audio.py b/tests/test_audio.py
index 310d082..d33fd3e 100644
--- a/tests/test_audio.py
+++ b/tests/test_audio.py
@@ -1,17 +1,20 @@
 import unittest
-from mock import patch, MagicMock
+from unittest.mock import patch
+from mock import MagicMock
 from flask import Flask
 from flask_ask import Ask, audio
 from flask_ask.models import _Field
 
+app = Flask(__name__)
 
 class AudioUnitTests(unittest.TestCase):
 
     def setUp(self):
-        self.ask_patcher = patch('flask_ask.core.find_ask', return_value=Ask())
-        self.ask_patcher.start()
-        self.context_patcher = patch('flask_ask.models.context', return_value=MagicMock())
-        self.context_patcher.start()
+        with app.app_context():
+            self.ask_patcher = patch('flask_ask.core.find_ask', return_value=Ask())
+            self.ask_patcher.start()
+            self.context_patcher = patch('flask_ask.models.context', return_value=MagicMock())
+            self.context_patcher.start()
 
     def tearDown(self):
         self.ask_patcher.stop()
diff --git a/tests/test_cache.py b/tests/test_cache.py
index 418dde8..3eafe3f 100644
--- a/tests/test_cache.py
+++ b/tests/test_cache.py
@@ -1,6 +1,6 @@
 import unittest
 from mock import patch, Mock
-from werkzeug.contrib.cache import SimpleCache
+from cachelib import SimpleCache
 from flask_ask.core import Ask
 from flask_ask.cache import push_stream, pop_stream, top_stream, set_stream
 
diff --git a/tests/test_core.py b/tests/test_core.py
index 6b424c4..ef055c3 100644
--- a/tests/test_core.py
+++ b/tests/test_core.py
@@ -3,7 +3,7 @@
 from aniso8601.timezone import UTCOffset, build_utcoffset
 from flask_ask.core import Ask
 
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from mock import patch, MagicMock
 import json
 
@@ -58,7 +58,7 @@ def test_tries_parsing_on_valueerror(self):
 
         # should cause a ValueError normally
         with self.assertRaises(ValueError):
-            datetime.utcfromtimestamp(max_timestamp)
+            datetime.fromtimestamp(max_timestamp, timezone.utc).replace(tzinfo=None)
 
         # should safely parse, assuming scale change needed
         # note: this assert looks odd, but Py2 handles the parsing