diff --git a/tools/release.py b/tools/release.py
new file mode 100644
index 00000000..526e41a4
--- /dev/null
+++ b/tools/release.py
@@ -0,0 +1,104 @@
+from __future__ import print_function
+import fileinput
+import re
+import os
+
+# Script to use when releasing new versions
+# Run from main repo directory with data submodule pulled in data/
+#
+# Note: this has not yet been tested thoughtly, VERIFY EVERYTHING THIS SCRIPT DOES MANUALLY
+#
+# Will automatically:
+# * Make sure you don't forget to pull any changes before you start
+# * Get current version number from CMakeLists.txt
+# * Merge dev -> master in the data submodule
+# * Tag release in data submodule
+# * Update dev in data submodule to point to the new merge commit
+# * Merge dev -> master in main repo
+# * Bump version number in main repo
+# * Tag release in main repo
+# * Update dev in main repo to point to the new merge commit
+#
+# After finished, verify everything is correct and push the changes
+
+print('\033[1;34m[*] Make sure all remote changes are pulled...\033[0m')
+os.system('git checkout dev')
+os.system('git pull --ff')
+os.system('git checkout master')
+os.system('git pull --ff')
+os.chdir('data')
+os.system('git checkout dev')
+os.system('git pull --ff')
+os.system('git checkout master')
+os.system('git pull --ff')
+os.chdir('..')
+
+print('\033[1;34m[*] Get version numbers...\033[0m')
+os.system('git checkout dev')
+major = None
+minor = None
+revision = None
+codename = None
+data = open('CMakeLists.txt', 'r').readlines()
+
+for i in range(len(data)):
+	m = re.match(r'^set\(COLOBOT_VERSION_(MAJOR|MINOR|REVISION)( +)([0-9])+\)$', data[i])
+	if m:
+		x = int(m.group(3))
+		if m.group(1) == 'MAJOR':
+			major = x
+		elif m.group(1) == 'MINOR':
+			minor = x
+		elif m.group(1) == 'REVISION':
+			# Increase revision number
+			x += 1
+			revision = x
+		data[i] = 'set(COLOBOT_VERSION_'+m.group(1)+m.group(2)+str(x)+')\n'
+
+	m = re.match(r'^(#?)set\(COLOBOT_VERSION_(UNRELEASED|RELEASE_CODENAME)( +)"(.+)"\)$', data[i])
+	if m:
+		comment = (m.group(2) == 'UNRELEASED')
+		if m.group(2) == 'RELEASE_CODENAME':
+			codename = m.group(4)
+		data[i] = ('#' if comment else '')+'set(COLOBOT_VERSION_'+m.group(2)+m.group(3)+'"'+m.group(4)+'")\n'
+
+os.system('git checkout master')
+version = '%d.%d.%d%s' % (major, minor, revision, codename)
+print('\033[1;32m[+] Building version '+version+'\033[0m')
+
+print('\033[1;34m[*] Merge data...\033[0m')
+os.chdir('data')
+os.system('git merge dev --no-ff -m "Release '+version+': Merge branch \'dev\'"')
+
+print('\033[1;34m[*] Tag data...\033[0m')
+os.system('git tag colobot-gold-'+version)
+
+print('\033[1;34m[*] Update dev on data...\033[0m')
+os.system('git checkout dev')
+os.system('git merge master --ff')
+os.system('git checkout master')
+
+print('\033[1;34m[*] Merge main...\033[0m')
+os.chdir('..')
+os.system('git merge dev --no-ff -m "Release '+version+': Merge branch \'dev\'"')
+
+print('\033[1;34m[*] Bump version number\033[0m')
+open('CMakeLists.txt', 'w').writelines(data)
+os.system('git commit data CMakeLists.txt -m "Release '+version+': Bump version"')
+
+print('\033[1;34m[*] Tag main...\033[0m')
+os.system('git tag colobot-gold-'+version)
+
+print('\033[1;34m[*] Update dev on main...\033[0m')
+os.system('git checkout dev')
+os.system('git merge master --ff')
+for i in range(len(data)):
+	m = re.match(r'^(#?)set\(COLOBOT_VERSION_(UNRELEASED|RELEASE_CODENAME)(.*)\)$', data[i])
+	if m:
+		comment = (m.group(2) == 'RELEASE_CODENAME')
+		data[i] = ('#' if comment else '')+'set(COLOBOT_VERSION_'+m.group(2)+m.group(3)+')\n'
+open('CMakeLists.txt', 'w').writelines(data)
+os.system('git commit CMakeLists.txt -m "Post-release '+version+'"')
+os.system('git checkout master')
+
+print('\033[1;32m[+] Done! Push when ready\033[0m')