diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dae6f391d6be34b13edc0a18e512ddabc47f4548..ec21e034873857002a7bf1451aa6fddcce05f586 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -19,7 +19,7 @@ stages:
 
 before_script:
 - uname -a
-- apt-get update && apt install -y libgl1-mesa-glx
+- apt-get update && apt install -y libgl1-mesa-glx libxkbcommon-x11-0 libegl1 libdbus-1-3
 - pip install -e .[dev]
 
 linting:
diff --git a/HISTORY.rst b/HISTORY.rst
index 6d97ddb7c00f7a80ab0b5a5a0ef4daa7bd5fc1f8..620b02fe7ea568b9562456f96d7d4517c6948002 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -28,3 +28,7 @@ History
 * Gui updated to PySide2
 * Pmw dependency dropped
 * Version number updated
+
+2024.4.0.0 (2024-02-01)
+------------------
+* Gui updated to PySide6
diff --git a/conda.recipe/meta.yaml b/conda.recipe/meta.yaml
index 4278af9234b716c9cf08a63e7d54a6b5d838efd5..1c25545403e29532d5f255f12806ee7446995346 100644
--- a/conda.recipe/meta.yaml
+++ b/conda.recipe/meta.yaml
@@ -1,6 +1,6 @@
 package:
   name: mseedpeek
-  version: 2023.3.1.0
+  version: 2024.4.0.0
 
 source:
   path: ../
@@ -15,7 +15,7 @@ requirements:
     - pip
   run:
     - python >=3.9
-    - pyside2
+    - pyside6
 
 test:
   source_files:
diff --git a/mseedpeek/__init__.py b/mseedpeek/__init__.py
index 1c06f1d4ee0e2d9b6bb7c5aa068e9644b2f2e487..61e14ca2683f9646370b49a7d127fb5835bed9c1 100644
--- a/mseedpeek/__init__.py
+++ b/mseedpeek/__init__.py
@@ -2,6 +2,6 @@
 
 """Top-level package for mseedpeek."""
 
-__author__ = """IRIS PASSCAL"""
+__author__ = """EPIC"""
 __email__ = 'software-support@passcal.nmt.edu'
-__version__ = '2023.3.1.0'
+__version__ = '2024.4.0.0'
diff --git a/mseedpeek/libtrace.py b/mseedpeek/libtrace.py
index 6c431eea7d401be69e4df9d9adac157406b0d239..60f1c7e9a9c3b1b62ccb5721b64e90a40fc48233 100755
--- a/mseedpeek/libtrace.py
+++ b/mseedpeek/libtrace.py
@@ -125,7 +125,7 @@ import time
 
 SPACE = " "
 
-# VERSION = "2023.3.0.0"
+# VERSION = "2024.4.0.0"
 
 
 class futils:
diff --git a/mseedpeek/mseedpeek.py b/mseedpeek/mseedpeek.py
index 613ac0cde2eb53bc9f8a23302f07baa80e03a0ce..b86546a5c72e982fa40a136dff8875b417710926 100644
--- a/mseedpeek/mseedpeek.py
+++ b/mseedpeek/mseedpeek.py
@@ -130,6 +130,14 @@
 # Pmw dependency dropped
 # Version number updated
 # Run build trace to thread
+################################################################
+#
+# modification
+# version: 2024.4.0.0
+# author: Omid Hosseini
+#
+# GUI updated to PySide6
+# Version number updated
 """
 
 import sys
@@ -139,7 +147,7 @@ import itertools
 from getopt import getopt
 from glob import glob
 from operator import mod
-from PySide2.QtWidgets import (QApplication, QWidget, QTabWidget,
+from PySide6.QtWidgets import (QApplication, QWidget, QTabWidget,
                                QLineEdit, QVBoxLayout, QHBoxLayout,
                                QTextEdit, QGroupBox, QLabel,
                                QComboBox, QPushButton, QSizePolicy,
@@ -147,8 +155,8 @@ from PySide2.QtWidgets import (QApplication, QWidget, QTabWidget,
                                QSpacerItem, QStackedWidget, QFileDialog,
                                QMessageBox, QProgressDialog, QTreeWidget,
                                QTreeWidgetItem)
-from PySide2.QtCore import (Qt, QObject, Signal, QThread, QTimer, QEventLoop)
-from PySide2.QtGui import QColor
+from PySide6.QtCore import (Qt, QObject, Signal, QThread, QTimer, QEventLoop)
+from PySide6.QtGui import QColor
 
 from mseedpeek.libtrace import *
 from mseedpeek.mseedInfo import *
@@ -291,7 +299,7 @@ class MainWindow(QWidget):
         self.window_layout.addWidget(self.tabwidget)
         self.build_trace_headers()  # build widgets for Trace Headers tab
         self.window_layout.addWidget(self.infobar)
-        self.window_layout.setMargin(0)  # set spacing
+        self.window_layout.setContentsMargins(0, 0, 0, 0)  # set spacing
 
     def build_help(self):
         """
@@ -574,7 +582,7 @@ class MainWindow(QWidget):
         stations_layout = QHBoxLayout(self.stations_box)
         rbuttons_layout = QHBoxLayout(self.radio_box)
         flush_exit_layout = QHBoxLayout(self.flush_exit_box)
-        flush_exit_layout.setMargin(0)
+        flush_exit_layout.setContentsMargins(0, 0, 0, 0)
         flush_exit_layout.setSpacing(450)
         dir_trace_layout = QFormLayout(self.dir_trace_box)
 
@@ -1562,7 +1570,7 @@ class SliderBox(QGroupBox):
         self.jump_menu.insertItem(0, "0")
         label2 = QLabel("Block Number")
         self.slider = QSlider(Qt.Horizontal)
-        self.slider.setTickPosition(self.slider.NoTicks)
+        self.slider.setTickPosition(self.slider.tickPosition().NoTicks)
 
         # layouts
         main_layout = QVBoxLayout(self)
diff --git a/setup.py b/setup.py
index b9b080e8714f1d23665a5f84598bf79e0f1f6383..f8ccda710022c5e7266842dafc0dfd39fe27e14d 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,7 @@ setup(
             'mseedpeek=mseedpeek.mseedpeek:main',
         ],
     },
-    install_requires=['PySide2'],
+    install_requires=['PySide6'],
     setup_requires=[],
     extras_require={
         'dev': [
@@ -44,6 +44,6 @@ setup(
     name='mseedpeek',
     packages=find_packages(include=['mseedpeek']),
     url='https://git.passcal.nmt.edu/software_public/passoft/mseedpeek',
-    version='2023.3.1.0',
+    version='2024.4.0.0',
     zip_safe=False,
 )