diff --git a/requirements.txt b/requirements.txt
index 078b708..4e0703c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-pexpect==4.8.0
\ No newline at end of file
+pexpect==4.9.0
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 2783277..d377403 100644
--- a/setup.py
+++ b/setup.py
@@ -26,7 +26,7 @@ def get_readme():
 if __name__ == '__main__':
 
     setuptools.setup(
-        install_requires=['pexpect==4.8.0'],  # dependency
+        install_requires=['pexpect==4.9.0'],  # dependency
         python_requires='>=3',
         packages=setuptools.find_packages(include=['siswrapper']),