diff --git a/kaist/gui/main.py b/kaist/gui/main.py
index f928f52..fd181d3 100644
--- a/kaist/gui/main.py
+++ b/kaist/gui/main.py
@@ -60,7 +60,7 @@ def main_page():
         [gui.CBox('Mute videos', key='mute_video', background_color=BACKGROUND_COLOR, default=True, tooltip="Set the volume to 0 while watching the videos")],
         [gui.Text('Playback speed', font=DEFAULT_FONT)],
         [gui.Text('1 = normal speed. More than 10 may cause issues!')],
-        [gui.Slider(range=(1, 20), default_value=config['playback_speed'], orientation='h', size=(MAX_WIDTH//4, 10), key='playback_speed', tooltip='Set the playback speed of the videos (1 = normal speed). More than 10 may cause issues!')],
+        [gui.Slider(range=(1, 20), default_value=config['playback_rate'], orientation='h', size=(MAX_WIDTH//4, 10), key='playback_rate', tooltip='Set the playback speed of the videos (1 = normal speed). More than 10 may cause issues!')],
     ]
 
     layout_tab2 = [
diff --git a/kaist/navigation/webdriver.py b/kaist/navigation/webdriver.py
index 22f4e3e..6c10b6b 100644
--- a/kaist/navigation/webdriver.py
+++ b/kaist/navigation/webdriver.py
@@ -1,4 +1,4 @@
-from selenium.webdriver import Chrome, Firefox, Ie, Edge, Opera
+from selenium.webdriver import Chrome, Firefox, Ie, Edge #, Opera
 from selenium.webdriver.chrome.service import Service as ChromeService
 from selenium.webdriver.firefox.service import Service as FirefoxService
 from selenium.webdriver.ie.service import Service as IeService
@@ -8,11 +8,11 @@
 from webdriver_manager.firefox import GeckoDriverManager
 from webdriver_manager.microsoft import IEDriverManager
 from webdriver_manager.microsoft import EdgeChromiumDriverManager
-from webdriver_manager.opera import OperaDriverManager
+# from webdriver_manager.opera import OperaDriverManager
 from webdriver_manager.core.utils import ChromeType
 
 
-AVAILABLE_BROWSERS = ['Chrome', 'Chromium', 'Brave', 'Firefox', 'IE', 'Edge', 'Opera']
+AVAILABLE_BROWSERS = ['Chrome', 'Chromium', 'Brave', 'Firefox', 'IE', 'Edge']#, 'Opera']
 
 
 def setup_webdriver(browser):
@@ -28,8 +28,8 @@ def setup_webdriver(browser):
         driver = Ie(service=IeService(IEDriverManager().install()))
     if browser.lower() == 'edge':
         driver = Edge(service=EdgeService(EdgeChromiumDriverManager().install()))
-    if browser.lower() == 'opera':
-        driver = Opera(executable_path=OperaDriverManager().install())
+    # if browser.lower() == 'opera':
+    #     driver = Opera(executable_path=OperaDriverManager().install())
     return driver
 
 
diff --git a/requirements.txt b/requirements.txt
index a0183a7..13ad2b2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
-selenium
-webdriver-manager
-pyyaml
-pysimplegui
-tk
-darkdetect
\ No newline at end of file
+PySimpleGUI==4.60.3
+darkdetect==0.7.1
+requests==2.28.1
+selenium==4.5.0
+webdriver-manager==3.8.3
+pyyaml==6.0
\ No newline at end of file