diff --git a/odmlui/__main__.py b/odmlui/__main__.py
index 0aa8361..c8a8cdf 100644
--- a/odmlui/__main__.py
+++ b/odmlui/__main__.py
@@ -1,18 +1,14 @@
 #!/usr/bin/env python
 import os
-
-import pygtkcompat
-
-import gtk
+import gi
+gi.require_version("Gtk", "3.0")
+from gi.repository import Gtk as gtk
 
 import odmlui
 
 from .editor import register_stock_icons, EditorWindow
 from .helpers import path_to_uri
 
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
-
 
 def main(filenames=None, debug=False):
     """
diff --git a/odmlui/attribute_view.py b/odmlui/attribute_view.py
index a64d518..9bb8271 100644
--- a/odmlui/attribute_view.py
+++ b/odmlui/attribute_view.py
@@ -1,20 +1,14 @@
-import pygtkcompat
-
 try:  # Python 3
     from html import escape as html_escape
 except ImportError:  # Python 2
     from cgi import escape as html_escape
 
 from odml import format as ofmt
-
-import gtk
+from gi.repository import Gtk as gtk
 
 from . import commands
 from .tree_view import TreeView
 
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
-
 COL_KEY = 0
 COL_VALUE = 1
 
diff --git a/odmlui/chooser_dialog.py b/odmlui/chooser_dialog.py
index fab4c87..7ba2bfb 100644
--- a/odmlui/chooser_dialog.py
+++ b/odmlui/chooser_dialog.py
@@ -1,12 +1,7 @@
 """
 'chooser_dialog' contains odML specific file chooser widget classes.
 """
-
-import pygtkcompat
-import gtk
-
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
+from gi.repository import Gtk as gtk
 
 
 class ChooserDialog(gtk.FileChooserDialog):
diff --git a/odmlui/drag_provider.py b/odmlui/drag_provider.py
index 847f163..fd9fb45 100644
--- a/odmlui/drag_provider.py
+++ b/odmlui/drag_provider.py
@@ -1,12 +1,8 @@
-import pygtkcompat
-import gtk
+from gi.repository import Gtk as gtk
 
 from .dnd.drag import DragTarget
 from .dnd.drop import DropTarget
 
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
-
 
 class DragProvider(object):
     """
diff --git a/odmlui/editor.py b/odmlui/editor.py
index 693e892..ba262d2 100644
--- a/odmlui/editor.py
+++ b/odmlui/editor.py
@@ -7,9 +7,9 @@
 
 import time
 import threading
-from gi.repository import GLib, GObject
-
-import pygtkcompat
+from gi.repository import GLib
+from gi.repository import GObject
+from gi.repository import Gtk as gtk
 
 from odml.property import BaseProperty
 import odml.terminology as terminology
@@ -19,9 +19,6 @@
 from odmlui.info import AUTHOR, CONTACT, COPYRIGHT, HOMEPAGE, VERSION, ODMLTABLES_VERSION
 from odmlui.treemodel import section_model, value_model
 
-import gtk
-import gobject
-
 from .attribute_view import AttributeView
 from .chooser_dialog import OdmlChooserDialog
 from .document_registry import DocumentRegistry
@@ -36,9 +33,6 @@
 from .section_view import SectionView
 from .wizard import DocumentWizard
 
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
-
 GObject.threads_init()
 
 UI_INFO = \
@@ -234,7 +228,7 @@ def __init__(self, parent=None):
 
         try:
             mergeid = merge.add_ui_from_string(UI_INFO)
-        except gobject.GError as msg:
+        except GObject.GError as msg:
             print("building menus failed: %s" % msg)
         menu_bar = merge.get_widget("/MenuBar")
         menu_bar.show()
@@ -1243,7 +1237,7 @@ def register_stock_icons():
 
             factory.add(icon_name, icon_set)
 
-        except gobject.GError as error:
+        except GObject.GError as error:
             print('[Warning] Failed to load icon', icon_name, error)
 
 
diff --git a/odmlui/info_bar.py b/odmlui/info_bar.py
index d1cf507..7d70813 100644
--- a/odmlui/info_bar.py
+++ b/odmlui/info_bar.py
@@ -1,13 +1,8 @@
 """
 The 'info_bar' module provides a class for the app specific message bar.
 """
-
-import pygtkcompat
-import glib
-import gtk
-
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
+from gi.repository import Gtk as gtk
+from gi.repository import GLib as glib
 
 
 class EditorInfoBar(gtk.InfoBar):
diff --git a/odmlui/message_dialog.py b/odmlui/message_dialog.py
index 061dc4e..607a9b5 100644
--- a/odmlui/message_dialog.py
+++ b/odmlui/message_dialog.py
@@ -1,9 +1,4 @@
-import pygtkcompat
-
-import gtk
-
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
+from gi.repository import Gtk as gtk
 
 
 class MessageDialog(gtk.MessageDialog):
diff --git a/odmlui/navigation_bar.py b/odmlui/navigation_bar.py
index 1026c21..1c53dfa 100644
--- a/odmlui/navigation_bar.py
+++ b/odmlui/navigation_bar.py
@@ -4,13 +4,7 @@
 This class provides functionality to browse from
 a currently selected model object to the document root.
 """
-
-import pygtkcompat
-
-import gtk
-
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
+from gi.repository import Gtk as gtk
 
 
 class NavigationBar(gtk.Label):
diff --git a/odmlui/property_view.py b/odmlui/property_view.py
index c02d781..a1555fa 100644
--- a/odmlui/property_view.py
+++ b/odmlui/property_view.py
@@ -2,8 +2,7 @@
 The 'property_view' module provides a class to display and edit odml.Properties
 and their attributes and Values.
 """
-
-import pygtkcompat
+from gi.repository import Gtk as gtk
 
 import odml
 import odml.dtypes as dtypes
@@ -11,8 +10,6 @@
 from odml import DType
 from odml.property import BaseProperty
 
-import gtk
-
 from . import commands
 from . import text_editor
 from .drag_provider import DragProvider
@@ -24,9 +21,6 @@
 from .dnd.text import TextDrag, TextDrop, TextGenericDropForPropertyTV
 from .message_dialog import DecisionDialog
 
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
-
 
 class PropertyView(TerminologyPopupTreeView):
     """
diff --git a/odmlui/scrolled_window.py b/odmlui/scrolled_window.py
index b08fc08..3232e56 100644
--- a/odmlui/scrolled_window.py
+++ b/odmlui/scrolled_window.py
@@ -1,9 +1,4 @@
-import pygtkcompat
-
-import gtk
-
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
+from gi.repository import Gtk as gtk
 
 
 class ScrolledWindow(gtk.ScrolledWindow):
diff --git a/odmlui/section_view.py b/odmlui/section_view.py
index 0e51929..ec634c3 100644
--- a/odmlui/section_view.py
+++ b/odmlui/section_view.py
@@ -1,5 +1,3 @@
-import pygtkcompat
-
 import odml
 
 from odml.section import BaseSection
@@ -12,9 +10,6 @@
 from .helpers import handle_section_import
 from .tree_view import TerminologyPopupTreeView
 
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
-
 
 class SectionView(TerminologyPopupTreeView):
     """
diff --git a/odmlui/text_editor.py b/odmlui/text_editor.py
index ce56282..ed07ddd 100644
--- a/odmlui/text_editor.py
+++ b/odmlui/text_editor.py
@@ -1,18 +1,12 @@
 """
 'text_editor' provides a simple TextEditor Window class.
 """
-
-import pygtkcompat
-
-import gtk
+from gi.repository import Gtk as gtk
 
 from .commands import ChangeValue
 from .scrolled_window import ScrolledWindow
 from .treemodel.value_model import Value
 
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
-
 
 class TextEditor(gtk.Window):
     """
diff --git a/odmlui/tree_view.py b/odmlui/tree_view.py
index c22a1a3..b8b7a6d 100644
--- a/odmlui/tree_view.py
+++ b/odmlui/tree_view.py
@@ -1,13 +1,7 @@
 import heapq
-import pygtkcompat
-
-import gtk
-
+from gi.repository import Gtk as gtk
 from . import commands
 
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
-
 
 class TreeView(object):
     """
diff --git a/odmlui/treemodel/property_model.py b/odmlui/treemodel/property_model.py
index 6e4010b..091e710 100644
--- a/odmlui/treemodel/property_model.py
+++ b/odmlui/treemodel/property_model.py
@@ -1,5 +1,3 @@
-import pygtkcompat
-
 from odml.property import BaseProperty
 from odml.section import BaseSection
 
@@ -7,9 +5,6 @@
 from .tree_model import TreeModel, ColumnMapper
 from . import value_model
 
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
-
 
 COL_MAPPER = ColumnMapper({"Name":        (0, "name"),
                            "Value":       (1, "pseudo_values"),
diff --git a/odmlui/validation_window.py b/odmlui/validation_window.py
index a4a384f..6d1fdf8 100644
--- a/odmlui/validation_window.py
+++ b/odmlui/validation_window.py
@@ -3,17 +3,11 @@
 """
 
 import sys
-
-import pygtkcompat
-
-import gtk
+from gi.repository import Gtk as gtk
 
 from .scrolled_window import ScrolledWindow
 from .tree_view import TreeView
 
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
-
 COL_PATH = 0
 COL_INDEX = 1
 COL_DESC = 2
diff --git a/odmlui/wizard.py b/odmlui/wizard.py
index 547349f..76cb004 100644
--- a/odmlui/wizard.py
+++ b/odmlui/wizard.py
@@ -8,21 +8,16 @@
 
 from collections import OrderedDict
 
-import pygtkcompat
-
 import odml
 import odml.terminology as terminology
 
-import gtk
+from gi.repository import Gtk as gtk
 
 from .helpers import handle_property_import, get_username
 from .treemodel.section_model import SectionModel
 from .section_view import SectionView
 from .scrolled_window import ScrolledWindow
 
-pygtkcompat.enable()
-pygtkcompat.enable_gtk(version='3.0')
-
 
 class Table(object):
     """
diff --git a/setup.py b/setup.py
index 3e303cb..d9203ee 100644
--- a/setup.py
+++ b/setup.py
@@ -34,11 +34,9 @@ class PackageNotFoundError(Exception):
 dep_str = "Non-Python dependency missing, please check the %s file." % README
 try:
     import gi
-    import pygtkcompat
-    pygtkcompat.enable()
-    pygtkcompat.enable_gtk(version="3.0")
-    import gtk
-    import gobject
+    gi.require_version("Gtk", "3.0")
+    from gi.repository import Gtk
+    from gi.repository import GObject
 except (ImportError, ValueError) as err:
     err_str = ("\n  Error: %s\n\n  %s" % (err, dep_str))
     raise PackageNotFoundError(err_str)