diff --git a/requirements/test.txt b/requirements/test.txt
index 01abf80c2..76e72a7ac 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -1,5 +1,4 @@
-Flask==2.3.3
-werkzeug==2.3.7
+Flask==3.0.0
 coverage==7.3.1
 argparse
 Django>=2.0.6
diff --git a/requirements/test_windows.txt b/requirements/test_windows.txt
index 2815d4de3..e1616d52b 100644
--- a/requirements/test_windows.txt
+++ b/requirements/test_windows.txt
@@ -1,4 +1,4 @@
-Flask==2.3.3
+Flask==3.0.0
 coverage==7.3.1
 argparse
 pytest==7.4.2
diff --git a/splinter/driver/flaskclient.py b/splinter/driver/flaskclient.py
index 390a46a8e..0eb988f8f 100644
--- a/splinter/driver/flaskclient.py
+++ b/splinter/driver/flaskclient.py
@@ -36,7 +36,7 @@ def delete_all(self):
 
     def all(self, verbose=False):  # NOQA: A003
         cookies = {}
-        for cookie in self.driver.cookie_jar:
+        for cookie in self.driver._cookies.values():
             cookies[cookie.key] = cookie.value
         return cookies
 
@@ -44,14 +44,14 @@ def __getitem__(self, item):
         return self.driver.get_cookie(item).value
 
     def __contains__(self, key):
-        for cookie in self.driver.cookie_jar:
+        for cookie in self.driver._cookies.values():
             if cookie.key == key:
                 return True
         return False
 
     def __eq__(self, other_object):
         if isinstance(other_object, dict):
-            cookies_dict = {c.key: c.value for c in self.driver.cookie_jar}
+            cookies_dict = {c.key: c.value for c in self.driver._cookies.values()}
             return cookies_dict == other_object
         return False
 
diff --git a/tests/test_flaskclient.py b/tests/test_flaskclient.py
index b58dec675..c8996f33c 100644
--- a/tests/test_flaskclient.py
+++ b/tests/test_flaskclient.py
@@ -171,7 +171,7 @@ def test_cookies_extra_parameters(self):
         """Cookie can be created with extra parameters."""
         timestamp = int(time.time() + 120)
         self.browser.cookies.add({"sha": "zam"}, expires=timestamp)
-        cookie = {c.key: c for c in self.browser._browser.cookie_jar}["sha"]
+        cookie = {c.key: c for c in self.browser._browser._cookies.values()}["sha"]
         assert timestamp == int(cookie.expires.timestamp())