diff -Nru a/src/ocrfeeder/studio/boxesarea.py b/src/ocrfeeder/studio/boxesarea.py
--- a/src/ocrfeeder/studio/boxesarea.py	2014-12-21 22:23:11.000000000 +0100
+++ b/src/ocrfeeder/studio/boxesarea.py	2018-06-07 18:08:21.268517664 +0200
@@ -18,6 +18,9 @@
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ###########################################################################
 
+import gi
+gi.require_version('Gtk', '3.0')
+gi.require_version('GooCanvas', '2.0')
 from gi.repository import Gtk, Gdk, GooCanvas, GObject, GdkPixbuf
 
 class BoxesArea(GooCanvas.Canvas):
diff -Nru a/src/ocrfeeder/studio/pagesiconview.py b/src/ocrfeeder/studio/pagesiconview.py
--- a/src/ocrfeeder/studio/pagesiconview.py	2014-08-01 12:08:39.000000000 +0200
+++ b/src/ocrfeeder/studio/pagesiconview.py	2018-06-07 18:08:46.070709446 +0200
@@ -20,6 +20,8 @@
 
 import os
 import gettext
+import gi
+gi.require_version('Gtk', '3.0')
 from gi.repository import Gtk, Gdk, GdkPixbuf, Pango
 _ = gettext.gettext
 
diff -Nru a/src/ocrfeeder/studio/studioBuilder.py b/src/ocrfeeder/studio/studioBuilder.py
--- a/src/ocrfeeder/studio/studioBuilder.py	2014-12-21 23:17:24.000000000 +0100
+++ b/src/ocrfeeder/studio/studioBuilder.py	2018-06-07 18:11:24.351943474 +0200
@@ -35,6 +35,8 @@
 from optparse import OptionParser
 import gettext
 import locale
+import gi
+gi.require_version('Gtk', '3.0')
 from gi.repository import Gdk, Gtk
 _ = gettext.gettext
 
diff -Nru a/src/ocrfeeder/studio/widgetModeler.py b/src/ocrfeeder/studio/widgetModeler.py
--- a/src/ocrfeeder/studio/widgetModeler.py	2014-12-22 00:56:24.000000000 +0100
+++ b/src/ocrfeeder/studio/widgetModeler.py	2018-06-07 18:09:07.230873440 +0200
@@ -34,6 +34,8 @@
     PageSizeDialog, UnpaperDialog, \
     QueuedEventsProgressDialog, SpellCheckerDialog
 import gettext
+import gi
+gi.require_version('Gtk', '3.0')
 from gi.repository import Gtk, GObject, Gdk, GdkPixbuf, Pango
 import math
 import os.path
diff -Nru a/src/ocrfeeder/studio/widgetPresenter.py b/src/ocrfeeder/studio/widgetPresenter.py
--- a/src/ocrfeeder/studio/widgetPresenter.py	2014-12-22 00:45:51.000000000 +0100
+++ b/src/ocrfeeder/studio/widgetPresenter.py	2018-06-07 18:07:30.242124679 +0200
@@ -28,6 +28,10 @@
 from enchant.checker import SpellChecker
 from PIL import Image
 import gettext
+import gi
+gi.require_version('Gtk', '3.0')
+gi.require_version('GtkSpell', '3.0')
+gi.require_version('GooCanvas', '2.0')
 from gi.repository import Gtk, GooCanvas, Gdk, GObject, GLib, GdkPixbuf, GtkSpell
 import os.path
 import signal
diff -Nru a/src/ocrfeeder/util/lib.py b/src/ocrfeeder/util/lib.py
--- a/src/ocrfeeder/util/lib.py	2014-07-31 00:12:17.000000000 +0200
+++ b/src/ocrfeeder/util/lib.py	2018-06-07 18:09:35.272091257 +0200
@@ -23,6 +23,8 @@
 import mimetypes
 from PIL import Image
 import tempfile
+import gi
+gi.require_version('Gtk', '3.0')
 from gi.repository import Gtk
 import math
 from constants import *