diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 9ae55c0..7b9ff22 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -49,14 +49,15 @@ jobs:
           libegl1 \
           libnotify4 \
           libxslt1.1 \
-          libevent-2.1-6 \
+          libevent-2.1-7 \
           libgles2 \
-          libvpx5 \
+          libvpx6 \
           libxcomposite1 \
           libatk1.0-0 \
           libatk-bridge2.0-0 \
           libepoxy0 \
           libgtk-3-0 \
+          libgstreamer-gl1.0-0 \
           libharfbuzz-icu0 \
           xvfb
     - name: Lint with flake8
diff --git a/Examples/browser-management/open-close-browser.robot b/Examples/browser-management/open-close-browser.robot
index 4af9152..836b686 100644
--- a/Examples/browser-management/open-close-browser.robot
+++ b/Examples/browser-management/open-close-browser.robot
@@ -5,10 +5,14 @@ Test Teardown    Close All Browser
 
 
 *** Variables ***
-${DEFAULT_BROWSER}    chrome
+${DEFAULT_BROWSER}    pwchrome
 
 
 *** Test Cases ***
+Open browser without option
+    ${BROWSER} =     Get variable value    ${BROWSER}    ${DEFAULT_BROWSER}
+    Open browser    http://127.0.0.1:7272/basic-html-elements.html    browser=${BROWSER}
+    
 Switch to new browser
     ${BROWSER} =     Get variable value    ${BROWSER}    ${DEFAULT_BROWSER}
     ${HEADLESS} =    Get variable value    ${HEADLESS}    ${False}
diff --git a/PuppeteerLibrary/keywords/browsermanagement.py b/PuppeteerLibrary/keywords/browsermanagement.py
index 66b5bff..8262185 100644
--- a/PuppeteerLibrary/keywords/browsermanagement.py
+++ b/PuppeteerLibrary/keywords/browsermanagement.py
@@ -12,7 +12,7 @@ def get_async_keyword_group(self) -> iBrowserManagementAsync:
         return self.ctx.get_current_library_context().get_async_keyword_group(type(self).__name__)
 
     @keyword
-    def open_browser(self, url, browser="chrome", alias=None, options=None):
+    def open_browser(self, url, browser="chrome", alias=None, options={}):
         """Opens a new browser instance to the specific ``url``.
 
         The ``browser`` argument specifies which browser to use.
diff --git a/PuppeteerLibrary/library_context/ilibrary_context.py b/PuppeteerLibrary/library_context/ilibrary_context.py
index 8745aa8..96c6dff 100644
--- a/PuppeteerLibrary/library_context/ilibrary_context.py
+++ b/PuppeteerLibrary/library_context/ilibrary_context.py
@@ -14,7 +14,7 @@ def __init__(self, browser_type: str):
         self.screenshot_path = os.curdir
     
     @abstractmethod
-    async def start_server(self, options: dict=None):
+    async def start_server(self, options: dict={}):
         pass
 
     @abstractmethod
@@ -26,7 +26,7 @@ def is_server_started(self) -> bool:
         pass
 
     @abstractmethod
-    async def create_new_page(self, options: dict=None) -> BasePage:
+    async def create_new_page(self, options: dict={}) -> BasePage:
         pass
 
     @abstractmethod
diff --git a/PuppeteerLibrary/playwright/playwright_context.py b/PuppeteerLibrary/playwright/playwright_context.py
index 5ea74d5..3ed6795 100644
--- a/PuppeteerLibrary/playwright/playwright_context.py
+++ b/PuppeteerLibrary/playwright/playwright_context.py
@@ -33,7 +33,7 @@ class PlaywrightContext(iLibraryContext):
     def __init__(self, browser_type: str):
         super().__init__(browser_type)
 
-    async def start_server(self, options: dict=None):
+    async def start_server(self, options: dict={}):
         default_options = {
             'slowMo': 0,
             'headless': True,
@@ -67,7 +67,7 @@ def is_server_started(self) -> bool:
             return True
         return False
 
-    async def create_new_page(self, options: dict=None) -> BasePage:
+    async def create_new_page(self, options: dict={}) -> BasePage:
         device_options = {
             'accept_downloads': True
         }
diff --git a/PuppeteerLibrary/puppeteer/puppeteer_context.py b/PuppeteerLibrary/puppeteer/puppeteer_context.py
index 45f847b..2a5e68c 100644
--- a/PuppeteerLibrary/puppeteer/puppeteer_context.py
+++ b/PuppeteerLibrary/puppeteer/puppeteer_context.py
@@ -35,7 +35,7 @@ class PuppeteerContext(iLibraryContext):
     def __init__(self, browser_type: str):
         super().__init__(browser_type)
 
-    async def start_server(self, options: dict=None):
+    async def start_server(self, options: dict={}):
         default_args = []
         default_options = {
             'slowMo': 0,
@@ -74,7 +74,7 @@ def is_server_started(self) -> bool:
             return True
         return False
 
-    async def create_new_page(self, options: dict=None) -> BasePage:
+    async def create_new_page(self, options: dict={}) -> BasePage:
         new_page = await self.browser.newPage()
         self.current_page = PuppeteerPage(new_page)
         if 'emulate' in options: