diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c9b3b1..fb5ddb7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - added .editorconfig file
 - added .gitignore file
 - added message when removing files during uninstallation
+- added Python script to update all the translation files at once
 
 ### Changed
 - convert to Python 3
diff --git a/translations/update-translations.py b/translations/update-translations.py
new file mode 100755
index 0000000..f58bb73
--- /dev/null
+++ b/translations/update-translations.py
@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Copyright (C) 2020 Romain Failliot <romain.failliot@foolstep.com>
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the license, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+# details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program.  You may also obtain a copy of the GNU General Public License
+# from the Free Software Foundation by visiting their web site
+# (http://www.fsf.org/) or by writing to the Free Software Foundation, Inc.,
+# 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+import glob
+import os
+import subprocess
+import shutil
+import tempfile
+
+def generate_pot_file():
+    subprocess.run(["xgettext", "-s", "-o", "diffuse.pot", "-L", "Python", "../src/usr/bin/diffuse"])
+
+def update_translation(filename):
+    print(f"Updating translation file '{filename}'...")
+
+    # Get language
+    lang = os.path.splitext(filename)[0]
+
+    # Move existing .po file to working directory
+    tmpfile = os.path.join(tmpdir, filename)
+    shutil.move(filename, tmpfile)
+
+    # Create a new .po file for this language
+    emptypofile = os.path.join(tmpdir, f"{lang}.empty.po")
+    subprocess.run(["msginit", "--no-wrap", "--no-translator", "-l", lang, "-o", emptypofile, "-i", "diffuse.pot"])
+
+    # Merge with the old translation
+    subprocess.run(["msgmerge", "-q", "--no-wrap", tmpfile, emptypofile, "-o", filename])
+
+    # Validate translation
+    print(f"Validation:")
+    subprocess.run(["msgfmt", "-c", "-v", filename])
+
+    print(f"Update done.")
+
+# Generate diffuse.pot file
+generate_pot_file()
+
+# Create temporary working directory
+tmpdir = tempfile.mkdtemp()
+
+try:
+    # Update PO files
+    po_files = glob.glob("*.po", recursive=False)
+    po_files.sort()
+    for file in po_files:
+        update_translation(file)
+finally:
+    # Remove working directory
+    shutil.rmtree(tmpdir)